Merge pull request #5482 from hsbt/rubygems-3-3-bundler-2-3

Merge RubyGems 3.3.x and Bundler 2.3.x

28 files changed, 553 insertions, 220 deletions

diff --git a/spec/bundler/bundler/cli_spec.rb b/spec/bundler/bundler/cli_spec.rb
index c5de12c211..28ade90138 100644
--- a/spec/bundler/bundler/cli_spec.rb
+++ b/spec/bundler/bundler/cli_spec.rb
@@ -170,7 +170,7 @@ RSpec.describe "bundle executable" do
         bundle "fail", :env => { "BUNDLER_VERSION" => bundler_version }, :raise_on_error => false
         expect(err).to start_with(<<-EOS.strip)
 The latest bundler is #{latest_version}, but you are currently running #{bundler_version}.
-To install the latest version, run `gem install bundler`
+To update to the most recent version, run `bundle update --bundler`
         EOS
       end
 
@@ -195,7 +195,7 @@ To install the latest version, run `gem install bundler`
           bundle "fail", :env => { "BUNDLER_VERSION" => bundler_version }, :raise_on_error => false
           expect(err).to start_with(<<-EOS.strip)
 The latest bundler is #{latest_version}, but you are currently running #{bundler_version}.
-To install the latest version, run `gem install bundler --pre`
+To update to the most recent version, run `bundle update --bundler`
           EOS
         end
       end
diff --git a/spec/bundler/bundler/endpoint_specification_spec.rb b/spec/bundler/bundler/endpoint_specification_spec.rb
index 2e2c16ec44..02a90d507a 100644
--- a/spec/bundler/bundler/endpoint_specification_spec.rb
+++ b/spec/bundler/bundler/endpoint_specification_spec.rb
@@ -5,9 +5,10 @@ RSpec.describe Bundler::EndpointSpecification do
   let(:version)      { "1.0.0" }
   let(:platform)     { Gem::Platform::RUBY }
   let(:dependencies) { [] }
+  let(:spec_fetcher) { double(:spec_fetcher) }
   let(:metadata)     { nil }
 
-  subject(:spec) { described_class.new(name, version, platform, dependencies, metadata) }
+  subject(:spec) { described_class.new(name, version, platform, spec_fetcher, dependencies, metadata) }
 
   describe "#build_dependency" do
     let(:name)           { "foo" }
@@ -48,7 +49,9 @@ RSpec.describe Bundler::EndpointSpecification do
   end
 
   it "supports equality comparison" do
-    other_spec = described_class.new("bar", version, platform, dependencies, metadata)
+    remote_spec = double(:remote_spec, :required_ruby_version => nil, :required_rubygems_version => nil)
+    allow(spec_fetcher).to receive(:fetch_spec).and_return(remote_spec)
+    other_spec = described_class.new("bar", version, platform, spec_fetcher, dependencies, metadata)
     expect(spec).to eql(spec)
     expect(spec).to_not eql(other_spec)
   end
diff --git a/spec/bundler/bundler/gem_helper_spec.rb b/spec/bundler/bundler/gem_helper_spec.rb
index 2c43719aa1..5cd79de620 100644
--- a/spec/bundler/bundler/gem_helper_spec.rb
+++ b/spec/bundler/bundler/gem_helper_spec.rb
@@ -66,6 +66,10 @@ RSpec.describe Bundler::GemHelper do
       mock_confirm_message message
     end
 
+    def sha512_hexdigest(path)
+      Digest::SHA512.file(path).hexdigest
+    end
+
     subject! { Bundler::GemHelper.new(app_path) }
     let(:app_version) { "0.1.0" }
     let(:app_gem_dir) { app_path.join("pkg") }
@@ -169,12 +173,21 @@ RSpec.describe Bundler::GemHelper do
     end
 
     describe "#build_checksum" do
+      it "calculates SHA512 of the content" do
+        FileUtils.mkdir_p(app_gem_dir)
+        File.write(app_gem_path, "")
+        mock_checksum_message app_name, app_version
+        subject.build_checksum(app_gem_path)
+        expect(File.read(app_sha_path).chomp).to eql(Digest::SHA512.hexdigest(""))
+      end
+
       context "when build was successful" do
         it "creates .sha512 file" do
           mock_build_message app_name, app_version
           mock_checksum_message app_name, app_version
           subject.build_checksum
           expect(app_sha_path).to exist
+          expect(File.read(app_sha_path).chomp).to eql(sha512_hexdigest(app_gem_path))
         end
       end
       context "when building in the current working directory" do
@@ -185,6 +198,7 @@ RSpec.describe Bundler::GemHelper do
             Bundler::GemHelper.new.build_checksum
           end
           expect(app_sha_path).to exist
+          expect(File.read(app_sha_path).chomp).to eql(sha512_hexdigest(app_gem_path))
         end
       end
       context "when building in a location relative to the current working directory" do
@@ -195,6 +209,7 @@ RSpec.describe Bundler::GemHelper do
             Bundler::GemHelper.new(File.basename(app_path)).build_checksum
           end
           expect(app_sha_path).to exist
+          expect(File.read(app_sha_path).chomp).to eql(sha512_hexdigest(app_gem_path))
         end
       end
     end
diff --git a/spec/bundler/commands/binstubs_spec.rb b/spec/bundler/commands/binstubs_spec.rb
index ceef07d36b..198226207b 100644
--- a/spec/bundler/commands/binstubs_spec.rb
+++ b/spec/bundler/commands/binstubs_spec.rb
@@ -182,30 +182,26 @@ RSpec.describe "bundle binstubs <gem>" do
         end
 
         context "and the version is older and the same major" do
-          let(:system_bundler_version) { "55.1" }
+          let(:system_bundler_version) { "2.999.999" }
 
           before do
-            lockfile lockfile.gsub(/BUNDLED WITH\n   .*$/m, "BUNDLED WITH\n   55.0")
-
-            update_repo2 do
-              with_built_bundler("55.0") {|gem_path| FileUtils.mv(gem_path, gem_repo2("gems")) }
-            end
+            lockfile lockfile.gsub(/BUNDLED WITH\n   .*$/m, "BUNDLED WITH\n   2.3.0")
           end
 
           it "installs and runs the exact version of bundler", :rubygems => ">= 3.3.0.dev" do
-            sys_exec "bin/bundle install --verbose", :env => { "BUNDLER_SPEC_GEM_SOURCES" => file_uri_for(gem_repo2).to_s, "RUBYOPT" => "-r#{spec_dir}/support/hax.rb" }
+            sys_exec "bin/bundle install --verbose", :artifice => "vcr"
             expect(exitstatus).not_to eq(42)
-            expect(out).to include("Bundler 55.1 is running, but your lockfile was generated with 55.0. Installing Bundler 55.0 and restarting using that version.")
-            expect(out).to include("Using bundler 55.0")
-            expect(err).not_to include("Activating bundler (~> 55.0) failed:")
+            expect(out).to include("Bundler 2.999.999 is running, but your lockfile was generated with 2.3.0. Installing Bundler 2.3.0 and restarting using that version.")
+            expect(out).to include("Using bundler 2.3.0")
+            expect(err).not_to include("Activating bundler (~> 2.3.0) failed:")
           end
 
           it "runs the available version of bundler", :rubygems => "< 3.3.0.dev" do
             sys_exec "bin/bundle install --verbose"
             expect(exitstatus).not_to eq(42)
-            expect(out).not_to include("Bundler 55.1 is running, but your lockfile was generated with 55.0. Installing Bundler 55.0 and restarting using that version.")
-            expect(out).to include("Using bundler 55.1")
-            expect(err).not_to include("Activating bundler (~> 55.0) failed:")
+            expect(out).not_to include("Bundler 2.999.999 is running, but your lockfile was generated with 2.3.0. Installing Bundler 2.3.0 and restarting using that version.")
+            expect(out).to include("Using bundler 2.999.999")
+            expect(err).not_to include("Activating bundler (~> 2.3.0) failed:")
           end
         end
 
diff --git a/spec/bundler/commands/cache_spec.rb b/spec/bundler/commands/cache_spec.rb
index 4f9c1c26c4..356a658e7c 100644
--- a/spec/bundler/commands/cache_spec.rb
+++ b/spec/bundler/commands/cache_spec.rb
@@ -403,14 +403,14 @@ RSpec.describe "bundle install with gem sources" do
 
       simulate_new_machine
 
-      simulate_platform "ruby" do
-        install_gemfile <<-G
-          source "#{file_uri_for(gem_repo1)}"
-          gem "platform_specific"
-        G
-        run "require 'platform_specific' ; puts PLATFORM_SPECIFIC"
-        expect(out).to eq("1.0.0 RUBY")
-      end
+      bundle "config set --local force_ruby_platform true"
+
+      install_gemfile <<-G
+        source "#{file_uri_for(gem_repo1)}"
+        gem "platform_specific"
+      G
+      run "require 'platform_specific' ; puts PLATFORM_SPECIFIC"
+      expect(out).to eq("1.0.0 RUBY")
     end
 
     it "does not update the cache if --no-cache is passed" do
diff --git a/spec/bundler/commands/doctor_spec.rb b/spec/bundler/commands/doctor_spec.rb
index 860b638f06..1eeb276105 100644
--- a/spec/bundler/commands/doctor_spec.rb
+++ b/spec/bundler/commands/doctor_spec.rb
@@ -49,8 +49,8 @@ RSpec.describe "bundle doctor" do
       doctor = Bundler::CLI::Doctor.new({})
       expect(doctor).to receive(:bundles_for_gem).exactly(2).times.and_return ["/path/to/rack/rack.bundle"]
       expect(doctor).to receive(:dylibs).exactly(2).times.and_return ["/usr/lib/libSystem.dylib"]
-      allow(File).to receive(:exist?).with("/usr/lib/libSystem.dylib").and_return(true)
-      expect { doctor.run }.not_to(raise_error, @stdout.string)
+      allow(Fiddle).to receive(:dlopen).with("/usr/lib/libSystem.dylib").and_return(true)
+      expect { doctor.run }.not_to raise_error
       expect(@stdout.string).to be_empty
     end
 
@@ -58,7 +58,7 @@ RSpec.describe "bundle doctor" do
       doctor = Bundler::CLI::Doctor.new({})
       expect(doctor).to receive(:bundles_for_gem).exactly(2).times.and_return ["/path/to/rack/rack.bundle"]
       expect(doctor).to receive(:dylibs).exactly(2).times.and_return ["/usr/local/opt/icu4c/lib/libicui18n.57.1.dylib"]
-      allow(File).to receive(:exist?).with("/usr/local/opt/icu4c/lib/libicui18n.57.1.dylib").and_return(false)
+      allow(Fiddle).to receive(:dlopen).with("/usr/local/opt/icu4c/lib/libicui18n.57.1.dylib").and_raise(Fiddle::DLError)
       expect { doctor.run }.to raise_error(Bundler::ProductionError, strip_whitespace(<<-E).strip), @stdout.string
         The following gems are missing OS dependencies:
          * bundler: /usr/local/opt/icu4c/lib/libicui18n.57.1.dylib
diff --git a/spec/bundler/commands/install_spec.rb b/spec/bundler/commands/install_spec.rb
index e00caa5315..ec1d9bcd02 100644
--- a/spec/bundler/commands/install_spec.rb
+++ b/spec/bundler/commands/install_spec.rb
@@ -499,20 +499,17 @@ RSpec.describe "bundle install with gem sources" do
     context "and using an unsupported Ruby version" do
       it "prints an error" do
         install_gemfile <<-G, :raise_on_error => false
-          ::RUBY_VERSION = '2.0.1'
-          ruby '~> 2.2'
+          ruby '~> 1.2'
           source "#{file_uri_for(gem_repo1)}"
         G
-        expect(err).to include("Your Ruby version is 2.0.1, but your Gemfile specified ~> 2.2")
+        expect(err).to include("Your Ruby version is #{RUBY_VERSION}, but your Gemfile specified ~> 1.2")
       end
     end
 
     context "and using a supported Ruby version" do
       before do
         install_gemfile <<-G
-          ::RUBY_VERSION = '2.1.3'
-          ::RUBY_PATCHLEVEL = 100
-          ruby '~> 2.1.0'
+          ruby '~> #{RUBY_VERSION}'
           source "#{file_uri_for(gem_repo1)}"
         G
       end
@@ -529,18 +526,16 @@ RSpec.describe "bundle install with gem sources" do
          DEPENDENCIES
 
          RUBY VERSION
-            ruby 2.1.3p100
+            #{Bundler::RubyVersion.system}
 
          BUNDLED WITH
             #{Bundler::VERSION}
         L
       end
 
-      it "updates Gemfile.lock with updated incompatible ruby version" do
+      it "updates Gemfile.lock with updated yet still compatible ruby version" do
         install_gemfile <<-G
-          ::RUBY_VERSION = '2.2.3'
-          ::RUBY_PATCHLEVEL = 100
-          ruby '~> 2.2.0'
+          ruby '~> #{RUBY_VERSION[0..2]}'
           source "#{file_uri_for(gem_repo1)}"
         G
 
@@ -555,7 +550,7 @@ RSpec.describe "bundle install with gem sources" do
          DEPENDENCIES
 
          RUBY VERSION
-            ruby 2.2.3p100
+            #{Bundler::RubyVersion.system}
 
          BUNDLED WITH
             #{Bundler::VERSION}
diff --git a/spec/bundler/commands/lock_spec.rb b/spec/bundler/commands/lock_spec.rb
index 22709f4528..fd1446af0e 100644
--- a/spec/bundler/commands/lock_spec.rb
+++ b/spec/bundler/commands/lock_spec.rb
@@ -337,7 +337,8 @@ RSpec.describe "bundle lock" do
          #{Bundler::VERSION}
     G
 
-    simulate_platform(rb) { bundle :lock }
+    bundle "config set --local force_ruby_platform true"
+    bundle :lock
 
     expect(lockfile).to eq <<~G
       GEM
diff --git a/spec/bundler/commands/newgem_spec.rb b/spec/bundler/commands/newgem_spec.rb
index ddefe0ba25..55a04b69c5 100644
--- a/spec/bundler/commands/newgem_spec.rb
+++ b/spec/bundler/commands/newgem_spec.rb
@@ -28,6 +28,10 @@ RSpec.describe "bundle gem" do
 
   let(:require_path) { "mygem" }
 
+  let(:minitest_test_file_path) { "test/test_mygem.rb" }
+
+  let(:minitest_test_class_name) { "class TestMygem < Minitest::Test" }
+
   before do
     sys_exec("git config --global user.name 'Bundler User'")
     sys_exec("git config --global user.email user@example.com")
@@ -702,7 +706,7 @@ RSpec.describe "bundle gem" do
       end
 
       it "builds spec skeleton" do
-        expect(bundled_app("#{gem_name}/test/test_#{require_path}.rb")).to exist
+        expect(bundled_app("#{gem_name}/#{minitest_test_file_path}")).to exist
         expect(bundled_app("#{gem_name}/test/test_helper.rb")).to exist
       end
     end
@@ -722,7 +726,7 @@ RSpec.describe "bundle gem" do
       end
 
       it "builds spec skeleton" do
-        expect(bundled_app("#{gem_name}/test/test_#{require_path}.rb")).to exist
+        expect(bundled_app("#{gem_name}/#{minitest_test_file_path}")).to exist
         expect(bundled_app("#{gem_name}/test/test_helper.rb")).to exist
       end
 
@@ -731,11 +735,15 @@ RSpec.describe "bundle gem" do
       end
 
       it "requires 'test_helper'" do
-        expect(bundled_app("#{gem_name}/test/test_#{require_path}.rb").read).to include(%(require "test_helper"))
+        expect(bundled_app("#{gem_name}/#{minitest_test_file_path}").read).to include(%(require "test_helper"))
+      end
+
+      it "defines valid test class name" do
+        expect(bundled_app("#{gem_name}/#{minitest_test_file_path}").read).to include(minitest_test_class_name)
       end
 
       it "creates a default test which fails" do
-        expect(bundled_app("#{gem_name}/test/test_#{require_path}.rb").read).to include("assert false")
+        expect(bundled_app("#{gem_name}/#{minitest_test_file_path}").read).to include("assert false")
       end
     end
 
@@ -1300,6 +1308,10 @@ RSpec.describe "bundle gem" do
 
     let(:require_relative_path) { "test_gem" }
 
+    let(:minitest_test_file_path) { "test/test_test_gem.rb" }
+
+    let(:minitest_test_class_name) { "class TestTestGem < Minitest::Test" }
+
     let(:flags) { nil }
 
     it "does not nest constants" do
@@ -1355,6 +1367,10 @@ RSpec.describe "bundle gem" do
 
     let(:require_relative_path) { "gem" }
 
+    let(:minitest_test_file_path) { "test/test/test_gem.rb" }
+
+    let(:minitest_test_class_name) { "class Test::TestGem < Minitest::Test" }
+
     it "nests constants so they work" do
       bundle "gem #{gem_name}"
       expect(bundled_app("#{gem_name}/lib/#{require_path}/version.rb").read).to match(/module Test\n  module Gem/)
diff --git a/spec/bundler/commands/remove_spec.rb b/spec/bundler/commands/remove_spec.rb
index 70dc09c9b6..95d6e75e9f 100644
--- a/spec/bundler/commands/remove_spec.rb
+++ b/spec/bundler/commands/remove_spec.rb
@@ -48,12 +48,14 @@ RSpec.describe "bundle remove" do
 
       context "when gem is specified in multiple lines" do
         it "shows success for removed gem" do
+          build_git "rack"
+
           gemfile <<-G
             source '#{file_uri_for(gem_repo1)}'
 
             gem 'git'
             gem 'rack',
-                git: 'https://github.com/rack/rack',
+                git: "#{lib_path("rack-1.0")}",
                 branch: 'master'
             gem 'nokogiri'
           G
diff --git a/spec/bundler/commands/update_spec.rb b/spec/bundler/commands/update_spec.rb
index 403a48a508..ee5d53c527 100644
--- a/spec/bundler/commands/update_spec.rb
+++ b/spec/bundler/commands/update_spec.rb
@@ -980,20 +980,14 @@ RSpec.describe "bundle update when a gem depends on a newer version of bundler"
 end
 
 RSpec.describe "bundle update --ruby" do
-  before do
-    install_gemfile <<-G
-        ::RUBY_VERSION = '2.1.3'
-        ::RUBY_PATCHLEVEL = 100
-        ruby '~> 2.1.0'
-        source "#{file_uri_for(gem_repo1)}"
-    G
-  end
-
   context "when the Gemfile removes the ruby" do
     before do
+      install_gemfile <<-G
+        ruby '~> #{RUBY_VERSION}'
+        source "#{file_uri_for(gem_repo1)}"
+      G
+
       gemfile <<-G
-          ::RUBY_VERSION = '2.1.4'
-          ::RUBY_PATCHLEVEL = 222
           source "#{file_uri_for(gem_repo1)}"
       G
     end
@@ -1018,10 +1012,13 @@ RSpec.describe "bundle update --ruby" do
 
   context "when the Gemfile specified an updated Ruby version" do
     before do
+      install_gemfile <<-G
+        ruby '~> #{RUBY_VERSION}'
+        source "#{file_uri_for(gem_repo1)}"
+      G
+
       gemfile <<-G
-          ::RUBY_VERSION = '2.1.4'
-          ::RUBY_PATCHLEVEL = 222
-          ruby '~> 2.1.0'
+          ruby '~> #{RUBY_VERSION[0..2]}'
           source "#{file_uri_for(gem_repo1)}"
       G
     end
@@ -1039,7 +1036,7 @@ RSpec.describe "bundle update --ruby" do
        DEPENDENCIES
 
        RUBY VERSION
-          ruby 2.1.4p222
+          #{Bundler::RubyVersion.system}
 
        BUNDLED WITH
           #{Bundler::VERSION}
@@ -1049,9 +1046,12 @@ RSpec.describe "bundle update --ruby" do
 
   context "when a different Ruby is being used than has been versioned" do
     before do
+      install_gemfile <<-G
+        ruby '~> #{RUBY_VERSION}'
+        source "#{file_uri_for(gem_repo1)}"
+      G
+
       gemfile <<-G
-          ::RUBY_VERSION = '2.2.2'
-          ::RUBY_PATCHLEVEL = 505
           ruby '~> 2.1.0'
           source "#{file_uri_for(gem_repo1)}"
       G
@@ -1059,16 +1059,31 @@ RSpec.describe "bundle update --ruby" do
     it "shows a helpful error message" do
       bundle "update --ruby", :raise_on_error => false
 
-      expect(err).to include("Your Ruby version is 2.2.2, but your Gemfile specified ~> 2.1.0")
+      expect(err).to include("Your Ruby version is #{Bundler::RubyVersion.system.gem_version}, but your Gemfile specified ~> 2.1.0")
     end
   end
 
   context "when updating Ruby version and Gemfile `ruby`" do
     before do
+      lockfile <<~L
+       GEM
+         remote: #{file_uri_for(gem_repo1)}/
+         specs:
+
+       PLATFORMS
+         #{lockfile_platforms}
+
+       DEPENDENCIES
+
+       RUBY VERSION
+          ruby 2.1.4p222
+
+       BUNDLED WITH
+          #{Bundler::VERSION}
+      L
+
       gemfile <<-G
-          ::RUBY_VERSION = '1.8.3'
-          ::RUBY_PATCHLEVEL = 55
-          ruby '~> 1.8.0'
+          ruby '~> #{RUBY_VERSION}'
           source "#{file_uri_for(gem_repo1)}"
       G
     end
@@ -1086,7 +1101,7 @@ RSpec.describe "bundle update --ruby" do
        DEPENDENCIES
 
        RUBY VERSION
-          ruby 1.8.3p55
+          #{Bundler::RubyVersion.system}
 
        BUNDLED WITH
           #{Bundler::VERSION}
@@ -1105,15 +1120,208 @@ RSpec.describe "bundle update --bundler" do
       source "#{file_uri_for(gem_repo4)}"
       gem "rack"
     G
-    allow(Bundler::SharedHelpers).to receive(:find_gemfile).and_return(bundled_app_gemfile)
     lockfile lockfile.sub(/(^\s*)#{Bundler::VERSION}($)/, '\11.0.0\2')
 
     FileUtils.rm_r gem_repo4
 
-    bundle :update, :bundler => true, :verbose => true
+    bundle :update, :bundler => true, :artifice => "compact_index", :verbose => true
+    expect(out).to include("Using bundler #{Bundler::VERSION}")
+
+    expect(lockfile).to eq <<~L
+      GEM
+        remote: #{file_uri_for(gem_repo4)}/
+        specs:
+          rack (1.0)
+
+      PLATFORMS
+        #{lockfile_platforms}
+
+      DEPENDENCIES
+        rack
+
+      BUNDLED WITH
+         #{Bundler::VERSION}
+    L
+
+    expect(the_bundle).to include_gem "rack 1.0"
+  end
+
+  it "updates the bundler version in the lockfile without re-resolving if the highest version is already installed" do
+    system_gems "bundler-2.3.3"
+
+    build_repo4 do
+      build_gem "rack", "1.0"
+    end
+
+    install_gemfile <<-G
+      source "#{file_uri_for(gem_repo4)}"
+      gem "rack"
+    G
+    lockfile lockfile.sub(/(^\s*)#{Bundler::VERSION}($)/, "2.3.3")
+
+    bundle :update, :bundler => true, :artifice => "compact_index", :verbose => true
+    expect(out).to include("Using bundler #{Bundler::VERSION}")
+
+    expect(lockfile).to eq <<~L
+      GEM
+        remote: #{file_uri_for(gem_repo4)}/
+        specs:
+          rack (1.0)
+
+      PLATFORMS
+        #{lockfile_platforms}
+
+      DEPENDENCIES
+        rack
+
+      BUNDLED WITH
+         #{Bundler::VERSION}
+    L
+
     expect(the_bundle).to include_gem "rack 1.0"
+  end
+
+  it "updates the bundler version in the lockfile even if the latest version is not installed", :ruby_repo, :realworld do
+    pristine_system_gems "bundler-2.3.3"
+
+    build_repo4 do
+      build_gem "rack", "1.0"
+    end
+
+    install_gemfile <<-G
+      source "#{file_uri_for(gem_repo4)}"
+      gem "rack"
+    G
+    lockfile lockfile.sub(/(^\s*)#{Bundler::VERSION}($)/, "2.3.3")
+
+    bundle :update, :bundler => true, :artifice => "vcr", :verbose => true
+
+    # Only updates properly on modern RubyGems.
+
+    if Gem.rubygems_version >= Gem::Version.new("3.3.0.dev")
+      expect(out).to include("Updating bundler to 2.3.4")
+      expect(out).to include("Using bundler 2.3.4")
+      expect(out).not_to include("Installing Bundler 2.3.3 and restarting using that version.")
+
+      expect(lockfile).to eq <<~L
+        GEM
+          remote: #{file_uri_for(gem_repo4)}/
+          specs:
+            rack (1.0)
+
+        PLATFORMS
+          #{lockfile_platforms}
+
+        DEPENDENCIES
+          rack
+
+        BUNDLED WITH
+           2.3.4
+      L
+
+      expect(the_bundle).to include_gems "bundler 2.3.4"
+    end
+
+    expect(the_bundle).to include_gems "rack 1.0"
+  end
+
+  it "errors if the explicit target version does not exist", :realworld do
+    pristine_system_gems "bundler-2.3.3"
+
+    build_repo4 do
+      build_gem "rack", "1.0"
+    end
+
+    install_gemfile <<-G
+      source "#{file_uri_for(gem_repo4)}"
+      gem "rack"
+    G
+    lockfile lockfile.sub(/(^\s*)#{Bundler::VERSION}($)/, "2.3.3")
+
+    bundle :update, :bundler => "999.999.999", :artifice => "vcr", :raise_on_error => false
 
-    expect(the_bundle.locked_gems.bundler_version).to eq v(Bundler::VERSION)
+    # Only gives a meaningful error message on modern RubyGems.
+
+    if Gem.rubygems_version >= Gem::Version.new("3.3.0.dev")
+      expect(last_command).to be_failure
+      expect(err).to include("The `bundle update --bundler` target version (999.999.999) does not exist")
+    end
+  end
+
+  it "allows updating to development versions if already installed locally" do
+    system_gems "bundler-2.3.0.dev"
+
+    build_repo4 do
+      build_gem "rack", "1.0"
+    end
+
+    install_gemfile <<-G
+      source "#{file_uri_for(gem_repo4)}"
+      gem "rack"
+    G
+
+    bundle :update, :bundler => "2.3.0.dev"
+
+    # Only updates properly on modern RubyGems.
+
+    if Gem.rubygems_version >= Gem::Version.new("3.3.0.dev")
+      expect(lockfile).to eq <<~L
+        GEM
+          remote: #{file_uri_for(gem_repo4)}/
+          specs:
+            rack (1.0)
+
+        PLATFORMS
+          #{lockfile_platforms}
+
+        DEPENDENCIES
+          rack
+
+        BUNDLED WITH
+           2.3.0.dev
+      L
+
+      expect(out).to include("Using bundler 2.3.0.dev")
+    end
+  end
+
+  it "does not touch the network if not necessary" do
+    system_gems "bundler-2.3.3"
+
+    build_repo4 do
+      build_gem "rack", "1.0"
+    end
+
+    install_gemfile <<-G
+      source "#{file_uri_for(gem_repo4)}"
+      gem "rack"
+    G
+
+    bundle :update, :bundler => "2.3.3", :raise_on_error => false
+
+    expect(out).not_to include("Fetching gem metadata from https://rubygems.org/")
+
+    # Only updates properly on modern RubyGems.
+
+    if Gem.rubygems_version >= Gem::Version.new("3.3.0.dev")
+      expect(lockfile).to eq <<~L
+        GEM
+          remote: #{file_uri_for(gem_repo4)}/
+          specs:
+            rack (1.0)
+
+        PLATFORMS
+          #{lockfile_platforms}
+
+        DEPENDENCIES
+          rack
+
+        BUNDLED WITH
+           2.3.3
+      L
+
+      expect(out).to include("Using bundler 2.3.3")
+    end
   end
 end
 
diff --git a/spec/bundler/install/gemfile/gemspec_spec.rb b/spec/bundler/install/gemfile/gemspec_spec.rb
index 6d9cd2daff..6bcfadab7e 100644
--- a/spec/bundler/install/gemfile/gemspec_spec.rb
+++ b/spec/bundler/install/gemfile/gemspec_spec.rb
@@ -179,7 +179,7 @@ RSpec.describe "bundle install from an existing gemspec" do
       gemspec :path => '#{tmp.join("foo")}'
     G
 
-    bundle "update --bundler", :verbose => true
+    bundle "update --bundler", :artifice => "compact_index", :verbose => true
     expect(the_bundle).to include_gems "foo 1.0", "platform_specific 1.0 JAVA"
   end
 
@@ -429,13 +429,16 @@ RSpec.describe "bundle install from an existing gemspec" do
           gemspec
         G
 
-        simulate_platform("ruby") { bundle "install" }
+        bundle "config set --local force_ruby_platform true"
+        bundle "install"
+
+        simulate_new_machine
         simulate_platform("jruby") { bundle "install" }
       end
 
       context "on ruby" do
         before do
-          simulate_platform("ruby")
+          bundle "config set --local force_ruby_platform true"
           bundle :install
         end
 
@@ -546,7 +549,7 @@ RSpec.describe "bundle install from an existing gemspec" do
     end
 
     it "installs the ruby platform gemspec" do
-      simulate_platform "ruby"
+      bundle "config set --local force_ruby_platform true"
 
       install_gemfile <<-G
         source "#{file_uri_for(gem_repo1)}"
@@ -557,7 +560,7 @@ RSpec.describe "bundle install from an existing gemspec" do
     end
 
     it "installs the ruby platform gemspec and skips dev deps with `without development` configured" do
-      simulate_platform "ruby"
+      bundle "config set --local force_ruby_platform true"
 
       bundle "config set --local without development"
       install_gemfile <<-G
@@ -622,4 +625,64 @@ RSpec.describe "bundle install from an existing gemspec" do
       expect(lockfile).to eq initial_lockfile
     end
   end
+
+  context "with multiple locked platforms" do
+    before do
+      build_lib("activeadmin", :path => tmp.join("activeadmin")) do |s|
+        s.version = "2.9.0"
+        s.add_dependency "railties", ">= 5.2", "< 6.2"
+      end
+
+      build_repo4 do
+        build_gem "railties", "6.1.4"
+
+        build_gem "jruby-openssl", "0.10.7" do |s|
+          s.platform = "java"
+        end
+      end
+
+      install_gemfile <<-G
+        source "#{file_uri_for(gem_repo4)}"
+        gemspec :path => "../activeadmin"
+        gem "jruby-openssl", :platform => :jruby
+      G
+
+      bundle "lock --add-platform java"
+    end
+
+    it "does not remove the platform specific specs from the lockfile when re-resolving due to gemspec changes" do
+      expect(lockfile).to eq <<~L
+        PATH
+          remote: ../activeadmin
+          specs:
+            activeadmin (2.9.0)
+              railties (>= 5.2, < 6.2)
+
+        GEM
+          remote: #{file_uri_for(gem_repo4)}/
+          specs:
+            jruby-openssl (0.10.7-java)
+            railties (6.1.4)
+
+        PLATFORMS
+          #{lockfile_platforms_for(["java"] + local_platforms)}
+
+        DEPENDENCIES
+          activeadmin!
+          jruby-openssl
+
+        BUNDLED WITH
+           #{Bundler::VERSION}
+      L
+
+      gemspec = tmp.join("activeadmin/activeadmin.gemspec")
+      File.write(gemspec, File.read(gemspec).sub(">= 5.2", ">= 6.0"))
+
+      previous_lockfile = lockfile
+
+      bundle "install --local"
+
+      expect(lockfile).to eq(previous_lockfile.sub(">= 5.2", ">= 6.0"))
+    end
+  end
 end
diff --git a/spec/bundler/install/gemfile/git_spec.rb b/spec/bundler/install/gemfile/git_spec.rb
index a0fb4a3cea..365a84f39e 100644
--- a/spec/bundler/install/gemfile/git_spec.rb
+++ b/spec/bundler/install/gemfile/git_spec.rb
@@ -92,9 +92,7 @@ RSpec.describe "bundle install with git sources" do
       expect(err).to include("The source contains the following gems matching 'foo':\n  * foo-1.0")
     end
 
-    it "complains with version and platform if pinned specs don't exist in the git repo" do
-      simulate_platform "java"
-
+    it "complains with version and platform if pinned specs don't exist in the git repo", :jruby do
       build_git "only_java" do |s|
         s.platform = "java"
       end
@@ -109,9 +107,7 @@ RSpec.describe "bundle install with git sources" do
       expect(err).to include("The source contains the following gems matching 'only_java':\n  * only_java-1.0-java")
     end
 
-    it "complains with multiple versions and platforms if pinned specs don't exist in the git repo" do
-      simulate_platform "java"
-
+    it "complains with multiple versions and platforms if pinned specs don't exist in the git repo", :jruby do
       build_git "only_java", "1.0" do |s|
         s.platform = "java"
       end
@@ -418,9 +414,6 @@ RSpec.describe "bundle install with git sources" do
 
   describe "when specifying local override" do
     it "uses the local repository instead of checking a new one out" do
-      # We don't generate it because we actually don't need it
-      # build_git "rack", "0.8"
-
       build_git "rack", "0.8", :path => lib_path("local-rack") do |s|
         s.write "lib/rack.rb", "puts :LOCAL"
       end
diff --git a/spec/bundler/install/gemfile/platform_spec.rb b/spec/bundler/install/gemfile/platform_spec.rb
index 35a3872c03..839db0089e 100644
--- a/spec/bundler/install/gemfile/platform_spec.rb
+++ b/spec/bundler/install/gemfile/platform_spec.rb
@@ -86,13 +86,13 @@ RSpec.describe "bundle install across platforms" do
     expect(the_bundle).to include_gems "nokogiri 1.4.2 JAVA", "weakling 0.0.3"
 
     simulate_new_machine
-
-    simulate_platform "ruby"
+    bundle "config set --local force_ruby_platform true"
     bundle "install"
 
     expect(the_bundle).to include_gems "nokogiri 1.4.2"
     expect(the_bundle).not_to include_gems "weakling"
 
+    simulate_new_machine
     simulate_platform "java"
     bundle "install"
 
@@ -453,7 +453,7 @@ RSpec.describe "bundle install with platform conditionals" do
   end
 
   it "does not attempt to install gems from :rbx when using --local" do
-    simulate_platform "ruby"
+    bundle "config set --local force_ruby_platform true"
 
     gemfile <<-G
       source "#{file_uri_for(gem_repo1)}"
@@ -465,7 +465,7 @@ RSpec.describe "bundle install with platform conditionals" do
   end
 
   it "does not attempt to install gems from other rubies when using --local" do
-    simulate_platform "ruby"
+    bundle "config set --local force_ruby_platform true"
     other_ruby_version_tag = RUBY_VERSION =~ /^1\.8/ ? :ruby_19 : :ruby_18
 
     gemfile <<-G
@@ -478,7 +478,7 @@ RSpec.describe "bundle install with platform conditionals" do
   end
 
   it "does not print a warning when a dependency is unused on a platform different from the current one" do
-    simulate_platform "ruby"
+    bundle "config set --local force_ruby_platform true"
 
     gemfile <<-G
       source "#{file_uri_for(gem_repo1)}"
diff --git a/spec/bundler/install/gemfile/ruby_spec.rb b/spec/bundler/install/gemfile/ruby_spec.rb
index fd4300c042..ba250acfdd 100644
--- a/spec/bundler/install/gemfile/ruby_spec.rb
+++ b/spec/bundler/install/gemfile/ruby_spec.rb
@@ -46,18 +46,16 @@ RSpec.describe "ruby requirement" do
   it "allows changing the ruby version requirement to something compatible" do
     install_gemfile <<-G
       source "#{file_uri_for(gem_repo1)}"
-      ruby ">= 1.0.0"
+      ruby ">= #{RUBY_VERSION[0..2]}.0"
       gem "rack"
     G
 
     allow(Bundler::SharedHelpers).to receive(:find_gemfile).and_return(bundled_app_gemfile)
     expect(locked_ruby_version).to eq(Bundler::RubyVersion.system)
 
-    simulate_ruby_version "5100"
-
     install_gemfile <<-G
       source "#{file_uri_for(gem_repo1)}"
-      ruby ">= 1.0.1"
+      ruby ">= #{RUBY_VERSION}"
       gem "rack"
     G
 
@@ -72,19 +70,35 @@ RSpec.describe "ruby requirement" do
       gem "rack"
     G
 
-    allow(Bundler::SharedHelpers).to receive(:find_gemfile).and_return(bundled_app_gemfile)
-    expect(locked_ruby_version).to eq(Bundler::RubyVersion.system)
+    lockfile <<~L
+      GEM
+        remote: #{file_uri_for(gem_repo1)}/
+        specs:
+          rack (1.0.0)
+
+      PLATFORMS
+        #{lockfile_platforms}
 
-    simulate_ruby_version "5100"
+      DEPENDENCIES
+        rack
+
+      RUBY VERSION
+         ruby 2.1.4p422
+
+      BUNDLED WITH
+         #{Bundler::VERSION}
+    L
+
+    allow(Bundler::SharedHelpers).to receive(:find_gemfile).and_return(bundled_app_gemfile)
 
     install_gemfile <<-G
       source "#{file_uri_for(gem_repo1)}"
-      ruby ">= 5000.0"
+      ruby ">= #{RUBY_VERSION[0..2]}.0"
       gem "rack"
     G
 
     expect(the_bundle).to include_gems "rack 1.0.0"
-    expect(locked_ruby_version.versions).to eq(["5100"])
+    expect(locked_ruby_version).to eq(Bundler::RubyVersion.system)
   end
 
   it "allows requirements with trailing whitespace" do
diff --git a/spec/bundler/install/gemfile/sources_spec.rb b/spec/bundler/install/gemfile/sources_spec.rb
index 5456e95f33..26ecb840c7 100644
--- a/spec/bundler/install/gemfile/sources_spec.rb
+++ b/spec/bundler/install/gemfile/sources_spec.rb
@@ -1443,4 +1443,57 @@ RSpec.describe "bundle install with gems on multiple sources" do
       L
     end
   end
+
+  context "when default source includes old gems with nil required_rubygems_version" do
+    before do
+      build_repo2 do
+        build_gem "ruport", "1.7.0.3" do |s|
+          s.add_dependency "pdf-writer", "1.1.8"
+        end
+      end
+
+      build_repo gem_repo4 do
+        build_gem "pdf-writer", "1.1.8"
+      end
+
+      path = "#{gem_repo4}/#{Gem::MARSHAL_SPEC_DIR}/pdf-writer-1.1.8.gemspec.rz"
+      spec = Marshal.load(Bundler.rubygems.inflate(File.binread(path)))
+      spec.instance_variable_set(:@required_rubygems_version, nil)
+      File.open(path, "wb") do |f|
+        f.write Gem.deflate(Marshal.dump(spec))
+      end
+
+      gemfile <<~G
+        source "https://localgemserver.test"
+
+        gem "ruport", "= 1.7.0.3", :source => "https://localgemserver.test/extra"
+      G
+    end
+
+    it "handles that fine" do
+      bundle "install", :artifice => "compact_index_extra", :env => { "BUNDLER_SPEC_GEM_REPO" => gem_repo4.to_s }
+
+      expect(lockfile).to eq <<~L
+        GEM
+          remote: https://localgemserver.test/
+          specs:
+            pdf-writer (1.1.8)
+
+        GEM
+          remote: https://localgemserver.test/extra/
+          specs:
+            ruport (1.7.0.3)
+              pdf-writer (= 1.1.8)
+
+        PLATFORMS
+          #{specific_local_platform}
+
+        DEPENDENCIES
+          ruport (= 1.7.0.3)!
+
+        BUNDLED WITH
+           #{Bundler::VERSION}
+      L
+    end
+  end
 end
diff --git a/spec/bundler/install/gems/dependency_api_spec.rb b/spec/bundler/install/gems/dependency_api_spec.rb
index 9738a75474..79317a7fad 100644
--- a/spec/bundler/install/gems/dependency_api_spec.rb
+++ b/spec/bundler/install/gems/dependency_api_spec.rb
@@ -402,17 +402,6 @@ RSpec.describe "gemcutter's dependency API" do
     expect(the_bundle).to include_gems "back_deps 1.0"
   end
 
-  it "uses the endpoint if all sources support it" do
-    gemfile <<-G
-      source "#{source_uri}"
-
-      gem 'foo'
-    G
-
-    bundle :install, :artifice => "endpoint_api_missing"
-    expect(the_bundle).to include_gems "foo 1.0"
-  end
-
   it "fetches again when more dependencies are found in subsequent sources using deployment mode", :bundler => "< 3" do
     build_repo2 do
       build_gem "back_deps" do |s|
diff --git a/spec/bundler/install/gems/resolving_spec.rb b/spec/bundler/install/gems/resolving_spec.rb
index 94fac0052c..b0209489b9 100644
--- a/spec/bundler/install/gems/resolving_spec.rb
+++ b/spec/bundler/install/gems/resolving_spec.rb
@@ -101,8 +101,6 @@ RSpec.describe "bundle install with install-time dependencies" do
   end
 
   it "installs gems with a dependency with no type" do
-    skip "incorrect data check error" if Gem.win_platform?
-
     build_repo2
 
     path = "#{gem_repo2}/#{Gem::MARSHAL_SPEC_DIR}/actionpack-2.3.2.gemspec.rz"
@@ -110,7 +108,7 @@ RSpec.describe "bundle install with install-time dependencies" do
     spec.dependencies.each do |d|
       d.instance_variable_set(:@type, :fail)
     end
-    File.open(path, "w") do |f|
+    File.open(path, "wb") do |f|
       f.write Gem.deflate(Marshal.dump(spec))
     end
 
@@ -226,6 +224,27 @@ RSpec.describe "bundle install with install-time dependencies" do
         expect(the_bundle).to include_gems("rack 1.2")
       end
 
+      it "installs the older version when using servers not implementing the compact index API" do
+        build_repo2 do
+          build_gem "rack", "1.2" do |s|
+            s.executables = "rackup"
+          end
+
+          build_gem "rack", "9001.0.0" do |s|
+            s.required_ruby_version = "> 9000"
+          end
+        end
+
+        install_gemfile <<-G, :artifice => "endpoint", :env => { "BUNDLER_SPEC_GEM_REPO" => gem_repo2.to_s }
+          ruby "#{RUBY_VERSION}"
+          source "http://localgemserver.test/"
+          gem 'rack'
+        G
+
+        expect(out).to_not include("rack-9001.0.0 requires ruby version > 9000")
+        expect(the_bundle).to include_gems("rack 1.2")
+      end
+
       it "installs the older version under rate limiting conditions" do
         build_repo4 do
           build_gem "rack", "9001.0.0" do |s|
@@ -286,8 +305,6 @@ RSpec.describe "bundle install with install-time dependencies" do
 
       shared_examples_for "ruby version conflicts" do
         it "raises an error during resolution" do
-          skip "ruby requirement includes platform and it shouldn't" if Gem.win_platform?
-
           install_gemfile <<-G, :artifice => "compact_index", :env => { "BUNDLER_SPEC_GEM_REPO" => gem_repo2.to_s }, :raise_on_error => false
             source "http://localgemserver.test/"
             ruby #{ruby_requirement}
@@ -303,8 +320,6 @@ RSpec.describe "bundle install with install-time dependencies" do
 
                 require_ruby was resolved to 1.0, which depends on
                   Ruby\0 (> 9000)
-
-            Ruby\0 (> 9000), which is required by gem 'require_ruby', is not available in the local ruby installation
           E
           expect(err).to end_with(nice_error)
         end
@@ -343,7 +358,15 @@ RSpec.describe "bundle install with install-time dependencies" do
       G
 
       expect(err).to_not include("Gem::InstallError: require_rubygems requires RubyGems version > 9000")
-      expect(err).to include("require_rubygems-1.0 requires rubygems version > 9000, which is incompatible with the current version, #{Gem::VERSION}")
+      nice_error = strip_whitespace(<<-E).strip
+        Bundler found conflicting requirements for the RubyGems\0 version:
+          In Gemfile:
+            RubyGems\0 (= #{Gem::VERSION})
+
+            require_rubygems was resolved to 1.0, which depends on
+              RubyGems\0 (> 9000)
+      E
+      expect(err).to end_with(nice_error)
     end
   end
 end
diff --git a/spec/bundler/lock/lockfile_spec.rb b/spec/bundler/lock/lockfile_spec.rb
index b9ef6e885a..561de9f3bc 100644
--- a/spec/bundler/lock/lockfile_spec.rb
+++ b/spec/bundler/lock/lockfile_spec.rb
@@ -1,18 +1,8 @@
 # frozen_string_literal: true
 
 RSpec.describe "the lockfile format" do
-  include Bundler::GemHelpers
-
   before do
-    build_repo2 do
-      # Capistrano did this (at least until version 2.5.10)
-      # RubyGems 2.2 doesn't allow the specifying of a dependency twice
-      # See https://github.com/rubygems/rubygems/commit/03dbac93a3396a80db258d9bc63500333c25bd2f
-      build_gem "double_deps", "1.0", :skip_validation => true do |s|
-        s.add_dependency "net-ssh", ">= 1.0.0"
-        s.add_dependency "net-ssh"
-      end
-    end
+    build_repo2
   end
 
   it "generates a simple lockfile for a single source, gem" do
@@ -90,12 +80,8 @@ RSpec.describe "the lockfile format" do
     G
   end
 
-  it "does not update the lockfile's bundler version if nothing changed during bundle install, but uses the locked version", :rubygems => ">= 3.3.0.a" do
-    version = "#{Bundler::VERSION.split(".").first}.0.0.a"
-
-    update_repo2 do
-      with_built_bundler(version) {|gem_path| FileUtils.mv(gem_path, gem_repo2("gems")) }
-    end
+  it "does not update the lockfile's bundler version if nothing changed during bundle install, but uses the locked version", :rubygems => ">= 3.3.0.a", :realworld => true do
+    version = "2.3.0"
 
     lockfile <<-L
       GEM
@@ -113,7 +99,7 @@ RSpec.describe "the lockfile format" do
          #{version}
     L
 
-    install_gemfile <<-G, :verbose => true, :env => { "BUNDLER_SPEC_GEM_SOURCES" => file_uri_for(gem_repo2).to_s }
+    install_gemfile <<-G, :verbose => true, :artifice => "vcr"
       source "#{file_uri_for(gem_repo2)}"
 
       gem "rack"
@@ -142,10 +128,6 @@ RSpec.describe "the lockfile format" do
   it "does not update the lockfile's bundler version if nothing changed during bundle install, and uses the latest version", :rubygems => "< 3.3.0.a" do
     version = "#{Bundler::VERSION.split(".").first}.0.0.a"
 
-    update_repo2 do
-      with_built_bundler(version) {|gem_path| FileUtils.mv(gem_path, gem_repo2("gems")) }
-    end
-
     lockfile <<-L
       GEM
         remote: #{file_uri_for(gem_repo2)}/
@@ -162,7 +144,7 @@ RSpec.describe "the lockfile format" do
          #{version}
     L
 
-    install_gemfile <<-G, :verbose => true, :env => { "BUNDLER_SPEC_GEM_SOURCES" => file_uri_for(gem_repo2).to_s }
+    install_gemfile <<-G, :verbose => true
       source "#{file_uri_for(gem_repo2)}"
 
       gem "rack"
@@ -761,6 +743,16 @@ RSpec.describe "the lockfile format" do
   end
 
   it "orders dependencies by version" do
+    update_repo2 do
+      # Capistrano did this (at least until version 2.5.10)
+      # RubyGems 2.2 doesn't allow the specifying of a dependency twice
+      # See https://github.com/rubygems/rubygems/commit/03dbac93a3396a80db258d9bc63500333c25bd2f
+      build_gem "double_deps", "1.0", :skip_validation => true do |s|
+        s.add_dependency "net-ssh", ">= 1.0.0"
+        s.add_dependency "net-ssh"
+      end
+    end
+
     install_gemfile <<-G
       source "#{file_uri_for(gem_repo2)}/"
       gem 'double_deps'
diff --git a/spec/bundler/other/platform_spec.rb b/spec/bundler/other/platform_spec.rb
index 5693d6bce6..bf38a05646 100644
--- a/spec/bundler/other/platform_spec.rb
+++ b/spec/bundler/other/platform_spec.rb
@@ -17,7 +17,7 @@ RSpec.describe "bundle platform" do
 
       bundle "platform"
       expect(out).to eq(<<-G.chomp)
-Your platform is: #{RUBY_PLATFORM}
+Your platform is: #{Gem::Platform.local}
 
 Your app has gems that work on these platforms:
 #{bundle_platform_platforms_string}
@@ -40,7 +40,7 @@ G
 
       bundle "platform"
       expect(out).to eq(<<-G.chomp)
-Your platform is: #{RUBY_PLATFORM}
+Your platform is: #{Gem::Platform.local}
 
 Your app has gems that work on these platforms:
 #{bundle_platform_platforms_string}
@@ -61,7 +61,7 @@ G
 
       bundle "platform"
       expect(out).to eq(<<-G.chomp)
-Your platform is: #{RUBY_PLATFORM}
+Your platform is: #{Gem::Platform.local}
 
 Your app has gems that work on these platforms:
 #{bundle_platform_platforms_string}
@@ -81,7 +81,7 @@ G
 
       bundle "platform"
       expect(out).to eq(<<-G.chomp)
-Your platform is: #{RUBY_PLATFORM}
+Your platform is: #{Gem::Platform.local}
 
 Your app has gems that work on these platforms:
 #{bundle_platform_platforms_string}
diff --git a/spec/bundler/runtime/inline_spec.rb b/spec/bundler/runtime/inline_spec.rb
index 2ffadebf55..24df758619 100644
--- a/spec/bundler/runtime/inline_spec.rb
+++ b/spec/bundler/runtime/inline_spec.rb
@@ -309,7 +309,7 @@ RSpec.describe "bundler/inline#gemfile" do
   end
 
   it "skips platform warnings" do
-    simulate_platform "ruby"
+    bundle "config set --local force_ruby_platform true"
 
     script <<-RUBY
       gemfile(true) do
diff --git a/spec/bundler/runtime/platform_spec.rb b/spec/bundler/runtime/platform_spec.rb
index b937de8059..f7159635e6 100644
--- a/spec/bundler/runtime/platform_spec.rb
+++ b/spec/bundler/runtime/platform_spec.rb
@@ -232,6 +232,20 @@ RSpec.describe "Bundler.setup with multi platform stuff" do
     expect(the_bundle).to include_gems "nokogiri 1.4.2", "platform_specific 1.0 RUBY"
   end
 
+  it "allows specifying only-ruby-platform even if the lockfile is locked to a specific compatible platform" do
+    install_gemfile <<-G
+      source "#{file_uri_for(gem_repo1)}"
+      gem "nokogiri"
+      gem "platform_specific"
+    G
+
+    bundle "config set force_ruby_platform true"
+
+    bundle "install"
+
+    expect(the_bundle).to include_gems "nokogiri 1.4.2", "platform_specific 1.0 RUBY"
+  end
+
   it "doesn't pull platform specific gems on truffleruby", :truffleruby do
     install_gemfile <<-G
      source "#{file_uri_for(gem_repo1)}"
diff --git a/spec/bundler/runtime/self_management_spec.rb b/spec/bundler/runtime/self_management_spec.rb
index 7746a6ffa9..0032c6aef6 100644
--- a/spec/bundler/runtime/self_management_spec.rb
+++ b/spec/bundler/runtime/self_management_spec.rb
@@ -1,15 +1,13 @@
 # frozen_string_literal: true
 
-RSpec.describe "Self management", :rubygems => ">= 3.3.0.dev" do
+RSpec.describe "Self management", :rubygems => ">= 3.3.0.dev", :realworld => true do
   describe "auto switching" do
-    let(:next_minor) do
-      Bundler::VERSION.split(".").map.with_index {|s, i| i == 1 ? s.to_i + 1 : s }[0..2].join(".")
+    let(:previous_minor) do
+      "2.3.0"
     end
 
     before do
-      build_repo2 do
-        with_built_bundler(next_minor) {|gem_path| FileUtils.mv(gem_path, gem_repo2("gems")) }
-      end
+      build_repo2
 
       gemfile <<-G
         source "#{file_uri_for(gem_repo2)}"
@@ -19,11 +17,11 @@ RSpec.describe "Self management", :rubygems => ">= 3.3.0.dev" do
     end
 
     it "installs locked version when using system path and uses it" do
-      lockfile_bundled_with(next_minor)
+      lockfile_bundled_with(previous_minor)
 
       bundle "config set --local path.system true"
-      bundle "install", :env => { "BUNDLER_SPEC_GEM_SOURCES" => file_uri_for(gem_repo2).to_s }
-      expect(out).to include("Bundler #{Bundler::VERSION} is running, but your lockfile was generated with #{next_minor}. Installing Bundler #{next_minor} and restarting using that version.")
+      bundle "install", :artifice => "vcr"
+      expect(out).to include("Bundler #{Bundler::VERSION} is running, but your lockfile was generated with #{previous_minor}. Installing Bundler #{previous_minor} and restarting using that version.")
 
       # It uninstalls the older system bundler
       bundle "clean --force"
@@ -31,21 +29,21 @@ RSpec.describe "Self management", :rubygems => ">= 3.3.0.dev" do
 
       # App now uses locked version
       bundle "-v"
-      expect(out).to end_with(next_minor[0] == "2" ? "Bundler version #{next_minor}" : next_minor)
+      expect(out).to end_with(previous_minor[0] == "2" ? "Bundler version #{previous_minor}" : previous_minor)
 
       # Subsequent installs use the locked version without reinstalling
       bundle "install --verbose"
-      expect(out).to include("Using bundler #{next_minor}")
-      expect(out).not_to include("Bundler #{Bundler::VERSION} is running, but your lockfile was generated with #{next_minor}. Installing Bundler #{next_minor} and restarting using that version.")
+      expect(out).to include("Using bundler #{previous_minor}")
+      expect(out).not_to include("Bundler #{Bundler::VERSION} is running, but your lockfile was generated with #{previous_minor}. Installing Bundler #{previous_minor} and restarting using that version.")
     end
 
     it "installs locked version when using local path and uses it" do
-      lockfile_bundled_with(next_minor)
+      lockfile_bundled_with(previous_minor)
 
       bundle "config set --local path vendor/bundle"
-      bundle "install", :env => { "BUNDLER_SPEC_GEM_SOURCES" => file_uri_for(gem_repo2).to_s }
-      expect(out).to include("Bundler #{Bundler::VERSION} is running, but your lockfile was generated with #{next_minor}. Installing Bundler #{next_minor} and restarting using that version.")
-      expect(vendored_gems("gems/bundler-#{next_minor}")).to exist
+      bundle "install", :artifice => "vcr"
+      expect(out).to include("Bundler #{Bundler::VERSION} is running, but your lockfile was generated with #{previous_minor}. Installing Bundler #{previous_minor} and restarting using that version.")
+      expect(vendored_gems("gems/bundler-#{previous_minor}")).to exist
 
       # It does not uninstall the locked bundler
       bundle "clean"
@@ -53,21 +51,21 @@ RSpec.describe "Self management", :rubygems => ">= 3.3.0.dev" do
 
       # App now uses locked version
       bundle "-v"
-      expect(out).to end_with(next_minor[0] == "2" ? "Bundler version #{next_minor}" : next_minor)
+      expect(out).to end_with(previous_minor[0] == "2" ? "Bundler version #{previous_minor}" : previous_minor)
 
       # Subsequent installs use the locked version without reinstalling
       bundle "install --verbose"
-      expect(out).to include("Using bundler #{next_minor}")
-      expect(out).not_to include("Bundler #{Bundler::VERSION} is running, but your lockfile was generated with #{next_minor}. Installing Bundler #{next_minor} and restarting using that version.")
+      expect(out).to include("Using bundler #{previous_minor}")
+      expect(out).not_to include("Bundler #{Bundler::VERSION} is running, but your lockfile was generated with #{previous_minor}. Installing Bundler #{previous_minor} and restarting using that version.")
     end
 
     it "installs locked version when using deployment option and uses it" do
-      lockfile_bundled_with(next_minor)
+      lockfile_bundled_with(previous_minor)
 
       bundle "config set --local deployment true"
-      bundle "install", :env => { "BUNDLER_SPEC_GEM_SOURCES" => file_uri_for(gem_repo2).to_s }
-      expect(out).to include("Bundler #{Bundler::VERSION} is running, but your lockfile was generated with #{next_minor}. Installing Bundler #{next_minor} and restarting using that version.")
-      expect(vendored_gems("gems/bundler-#{next_minor}")).to exist
+      bundle "install", :artifice => "vcr"
+      expect(out).to include("Bundler #{Bundler::VERSION} is running, but your lockfile was generated with #{previous_minor}. Installing Bundler #{previous_minor} and restarting using that version.")
+      expect(vendored_gems("gems/bundler-#{previous_minor}")).to exist
 
       # It does not uninstall the locked bundler
       bundle "clean"
@@ -75,16 +73,16 @@ RSpec.describe "Self management", :rubygems => ">= 3.3.0.dev" do
 
       # App now uses locked version
       bundle "-v"
-      expect(out).to end_with(next_minor[0] == "2" ? "Bundler version #{next_minor}" : next_minor)
+      expect(out).to end_with(previous_minor[0] == "2" ? "Bundler version #{previous_minor}" : previous_minor)
 
       # Subsequent installs use the locked version without reinstalling
       bundle "install --verbose"
-      expect(out).to include("Using bundler #{next_minor}")
-      expect(out).not_to include("Bundler #{Bundler::VERSION} is running, but your lockfile was generated with #{next_minor}. Installing Bundler #{next_minor} and restarting using that version.")
+      expect(out).to include("Using bundler #{previous_minor}")
+      expect(out).not_to include("Bundler #{Bundler::VERSION} is running, but your lockfile was generated with #{previous_minor}. Installing Bundler #{previous_minor} and restarting using that version.")
     end
 
     it "does not try to install a development version" do
-      lockfile_bundled_with("#{next_minor}.dev")
+      lockfile_bundled_with("#{previous_minor}.dev")
 
       bundle "install --verbose"
       expect(out).not_to match(/restarting using that version/)
@@ -93,17 +91,13 @@ RSpec.describe "Self management", :rubygems => ">= 3.3.0.dev" do
       expect(out).to eq(Bundler::VERSION[0] == "2" ? "Bundler version #{Bundler::VERSION}" : Bundler::VERSION)
     end
 
-    it "shows a discreet message if locked bundler does not exist, and something more complete in `--verbose` mode" do
+    it "shows a discreet message if locked bundler does not exist" do
       missing_minor ="#{Bundler::VERSION[0]}.999.999"
 
       lockfile_bundled_with(missing_minor)
 
-      bundle "install"
-      expect(err).to eq("There was an error installing the locked bundler version (#{missing_minor}), rerun with the `--verbose` flag for more details. Going on using bundler #{Bundler::VERSION}.")
-
-      bundle "install --verbose"
-      expect(err).to include("There was an error installing the locked bundler version (#{missing_minor}), rerun with the `--verbose` flag for more details. Going on using bundler #{Bundler::VERSION}.")
-      expect(err).to include("Gem::UnsatisfiableDependencyError")
+      bundle "install", :artifice => "vcr"
+      expect(err).to eq("Your lockfile is locked to a version of bundler (#{missing_minor}) that doesn't exist at https://rubygems.org/. Going on using #{Bundler::VERSION}")
 
       bundle "-v"
       expect(out).to eq(Bundler::VERSION[0] == "2" ? "Bundler version #{Bundler::VERSION}" : Bundler::VERSION)
diff --git a/spec/bundler/support/artifice/endpoint_api_missing.rb b/spec/bundler/support/artifice/endpoint_api_missing.rb
deleted file mode 100644
index 755c42e836..0000000000
--- a/spec/bundler/support/artifice/endpoint_api_missing.rb
+++ /dev/null
@@ -1,18 +0,0 @@
-# frozen_string_literal: true
-
-require_relative "endpoint"
-
-Artifice.deactivate
-
-class EndpointApiMissing < Endpoint
-  get "/fetch/actual/gem/:id" do
-    warn params[:id]
-    if params[:id] == "rack-1.0.gemspec.rz"
-      halt 404
-    else
-      File.binread("#{gem_repo2}/quick/Marshal.4.8/#{params[:id]}")
-    end
-  end
-end
-
-Artifice.activate_with(EndpointApiMissing)
diff --git a/spec/bundler/support/artifice/vcr.rb b/spec/bundler/support/artifice/vcr.rb
index 0d51201bef..ceb133346f 100644
--- a/spec/bundler/support/artifice/vcr.rb
+++ b/spec/bundler/support/artifice/vcr.rb
@@ -69,7 +69,7 @@ class BundlerVCRHTTP < Net::HTTP
     end
 
     def file_name_for_key(key)
-      key.join("/").gsub(/[\:*?"<>|]/, "-")
+      File.join(*key).gsub(/[\:*?"<>|]/, "-")
     end
 
     def request_pair_paths
diff --git a/spec/bundler/support/hax.rb b/spec/bundler/support/hax.rb
index 4a49ffb49f..3d97b93c5a 100644
--- a/spec/bundler/support/hax.rb
+++ b/spec/bundler/support/hax.rb
@@ -19,16 +19,6 @@ module Gem
       @local = new(ENV["BUNDLER_SPEC_PLATFORM"])
     end
     @platforms = [Gem::Platform::RUBY, Gem::Platform.local]
-
-    if ENV["BUNDLER_SPEC_PLATFORM"] == "ruby"
-      class << self
-        remove_method :finish_resolve
-
-        def finish_resolve
-          []
-        end
-      end
-    end
   end
 
   if ENV["BUNDLER_SPEC_GEM_SOURCES"]
diff --git a/spec/bundler/support/helpers.rb b/spec/bundler/support/helpers.rb
index 99baec24d4..c27096a0cf 100644
--- a/spec/bundler/support/helpers.rb
+++ b/spec/bundler/support/helpers.rb
@@ -88,7 +88,6 @@ module Spec
 
       requires = options.delete(:requires) || []
       realworld = RSpec.current_example.metadata[:realworld]
-      options[:verbose] = true if options[:verbose].nil? && realworld
 
       artifice = options.delete(:artifice) do
         if realworld
@@ -448,15 +447,6 @@ module Spec
       ENV["BUNDLER_SPEC_PLATFORM"] = old if block_given?
     end
 
-    def simulate_ruby_version(version)
-      return if version == RUBY_VERSION
-      old = ENV["BUNDLER_SPEC_RUBY_VERSION"]
-      ENV["BUNDLER_SPEC_RUBY_VERSION"] = version
-      yield if block_given?
-    ensure
-      ENV["BUNDLER_SPEC_RUBY_VERSION"] = old if block_given?
-    end
-
     def simulate_windows(platform = mswin)
       simulate_platform platform do
         simulate_bundler_version_when_missing_prerelease_default_gem_activation do
diff --git a/spec/bundler/support/rubygems_ext.rb b/spec/bundler/support/rubygems_ext.rb
index 62ba4d56c4..fd5f06b14f 100644
--- a/spec/bundler/support/rubygems_ext.rb
+++ b/spec/bundler/support/rubygems_ext.rb
@@ -119,7 +119,7 @@ module Spec
         ENV["BUNDLE_PATH__SYSTEM"] = "true"
       end
 
-      output = `#{Gem.ruby} #{File.expand_path("support/bundle.rb", Path.spec_dir)} install`
+      output = `#{Gem.ruby} #{File.expand_path("support/bundle.rb", Path.spec_dir)} install --verbose`
       raise "Error when installing gems in #{gemfile}: #{output}" unless $?.success?
     ensure
       if path