1 files changed, 859 insertions, 0 deletions
diff --git a/test/rubygems/test_gem_commands_exec_command.rb b/test/rubygems/test_gem_commands_exec_command.rb
new file mode 100644
index 0000000000..e52fe247a2
--- /dev/null
+++ b/test/rubygems/test_gem_commands_exec_command.rb
@@ -0,0 +1,859 @@
+# frozen_string_literal: true
+
+require_relative "helper"
+require "rubygems/commands/exec_command"
+
+class TestGemCommandsExecCommand < Gem::TestCase
+  def setup
+    @orig_args = Gem::Command.build_args
+    @orig_specific_extra_args = Gem::Command.specific_extra_args_hash.dup
+    @orig_extra_args = Gem::Command.extra_args.dup
+
+    super
+    common_installer_setup
+
+    @cmd = Gem::Commands::ExecCommand.new
+
+    @gem_home = Gem.dir
+    @gem_path = Gem.path
+    @test_arch = RbConfig::CONFIG["arch"]
+
+    @installed_specs = []
+    Gem.post_install {|installer| @installed_specs << installer.spec }
+  end
+
+  def teardown
+    super
+
+    common_installer_teardown
+
+    Gem::Command.build_args = @orig_args
+    Gem::Command.specific_extra_args_hash = @orig_specific_extra_args
+    Gem::Command.extra_args = @orig_extra_args
+    Gem.configuration = nil
+  end
+
+  def invoke(*args)
+    @ui.outs.truncate(0)
+    @ui.outs.rewind
+    @ui.errs.truncate(0)
+    @ui.errs.rewind
+    @installed_specs.clear
+
+    @cmd.invoke(*args)
+  ensure
+    Gem::Specification.unresolved_deps.clear
+    Gem.loaded_specs.clear
+    Gem.instance_variable_set(:@activated_gem_paths, 0)
+    Gem.clear_default_specs
+    Gem.use_paths(@gem_home, @gem_path)
+    Gem.refresh
+  end
+
+  def test_error_with_no_arguments
+    e = assert_raise Gem::CommandLineError do
+      @cmd.invoke
+    end
+    assert_equal "Please specify an executable to run (e.g. gem exec COMMAND)",
+      e.message
+  end
+
+  def test_error_with_no_executable
+    e = assert_raise Gem::CommandLineError do
+      @cmd.invoke "--verbose", "--gem", "GEM", "--version", "< 10", "--conservative"
+    end
+    assert_equal "Please specify an executable to run (e.g. gem exec COMMAND)",
+      e.message
+  end
+
+  def test_full_option_parsing
+    @cmd.when_invoked do |options|
+      assert_equal options, {
+        args: ["install", "--no-color", "--help", "--verbose"],
+        executable: "pod",
+        explicit_prerelease: false,
+        gem_name: "cocoapods",
+        prerelease: false,
+        version: Gem::Requirement.new(["> 1", "< 1.3"]),
+        build_args: nil,
+      }
+    end
+    @cmd.invoke "--gem", "cocoapods", "-v", "> 1", "--version", "< 1.3", "--verbose", "--", "pod", "install", "--no-color", "--help", "--verbose"
+  end
+
+  def test_single_arg_parsing
+    @cmd.when_invoked do |options|
+      assert_equal options, {
+        args: [],
+        executable: "rails",
+        gem_name: "rails",
+        version: Gem::Requirement.new([">= 0"]),
+        build_args: nil,
+      }
+    end
+    @cmd.invoke "rails"
+  end
+
+  def test_single_arg_parsing_with_version
+    @cmd.when_invoked do |options|
+      assert_equal options, {
+        args: [],
+        executable: "rails",
+        gem_name: "rails",
+        version: Gem::Requirement.new(["= 7.1"]),
+        build_args: nil,
+      }
+    end
+    @cmd.invoke "rails:7.1"
+  end
+
+  def test_gem_without_executable
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 2
+    end
+
+    util_clear_gems
+
+    use_ui @ui do
+      e = assert_raise Gem::MockGemUi::TermError, @ui.error do
+        @cmd.invoke "a:2"
+      end
+      assert_equal 1, e.exit_code
+      assert_equal "ERROR:  Failed to load executable `a`, are you sure the gem `a` contains it?\n", @ui.error
+    end
+  end
+
+  def test_gem_with_executable
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 2 do |s|
+        s.executables = %w[a]
+        s.files = %w[bin/a lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump}"
+        end
+      end
+    end
+
+    util_clear_gems
+
+    use_ui @ui do
+      @cmd.invoke "a:2"
+      assert_equal "a-2\n", @ui.output
+    end
+  end
+
+  def test_gem_with_platforms
+    spec_fetcher do |fetcher|
+      fetcher.download "a", 2 do |s|
+        s.executables = %w[a]
+        s.files = %w[bin/a lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump}"
+        end
+      end
+
+      fetcher.download "a", 2 do |s|
+        s.executables = %w[a]
+        s.files = %w[bin/a lib/a.rb]
+        s.platform = "x86_64-darwin"
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump}"
+        end
+      end
+    end
+
+    use_ui @ui do
+      invoke "a:2"
+      assert_equal "a-2\n", @ui.output
+    end
+
+    use_ui @ui do
+      util_set_arch "x86_64-darwin-18"
+      invoke "a:2"
+      assert_equal "a-2-x86_64-darwin\n", @ui.output
+    end
+  end
+
+  def test_gem_with_platform_dependencies
+    spec_fetcher do |fetcher|
+      fetcher.download "a", 2 do |s|
+        s.executables = %w[a]
+        s.files = %w[bin/a lib/a.rb]
+        s.add_runtime_dependency "with_platform"
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << 'require "with_platform"' << "\n"
+          f << 'Gem.ui.say Gem.loaded_specs.each_value.map(&:original_name).sort.join("\n")'
+        end
+      end
+
+      fetcher.download "with_platform", 2 do |s|
+        s.files = %w[lib/with_platform.rb]
+        s.platform = Gem::Platform.local
+      end
+
+      fetcher.download "with_platform", 2 do |s|
+        s.files = %w[lib/with_platform.rb]
+      end
+    end
+
+    use_ui @ui do
+      util_set_arch "unknown-unknown"
+      invoke "a"
+      assert_equal "a-2\nwith_platform-2\n", @ui.output
+    end
+
+    use_ui @ui do
+      util_set_arch @test_arch
+      invoke "a"
+      assert_empty @ui.error
+      assert_equal "a-2\nwith_platform-2-#{Gem::Platform.local}\n", @ui.output
+    end
+  end
+
+  def test_gem_with_platform_and_platform_dependencies
+    pend "extensions don't quite work on jruby" if Gem.java_platform?
+    pend "terminates on mswin" if vc_windows? && ruby_repo?
+
+    spec_fetcher do |fetcher|
+      fetcher.download "a", 2 do |s|
+        s.executables = %w[a]
+        s.files = %w[bin/a lib/a.rb]
+        s.add_runtime_dependency "with_platform"
+        s.platform = Gem::Platform.local.to_s
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << 'require "with_platform"' << "\n"
+          f << 'Gem.ui.say Gem.loaded_specs.each_value.map(&:original_name).sort.join("\n")'
+        end
+      end
+
+      fetcher.download "a", 2 do |s|
+        s.executables = %w[a]
+        s.files = %w[bin/a lib/a.rb extconf.rb]
+        s.add_runtime_dependency "with_platform"
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << 'require "with_platform"' << "\n"
+          f << 'Gem.ui.say Gem.loaded_specs.each_value.map(&:original_name).sort.join("\n")'
+        end
+
+        s.extensions = %w[extconf.rb]
+        write_file File.join(*%W[gems #{s.original_name} extconf.rb]) do |f|
+          f.write <<-RUBY
+            gem('with_platform', '~> 2.0')
+            require 'with_platform'
+            gem 'sometimes_used'
+            require 'sometimes_used'
+            require "mkmf"
+            create_makefile("#{s.name}")
+          RUBY
+        end
+      end
+
+      fetcher.download "with_platform", 2 do |s|
+        s.files = %w[lib/with_platform.rb]
+        s.platform = Gem::Platform.local.to_s
+      end
+
+      fetcher.download "with_platform", 2 do |s|
+        s.files = %w[lib/with_platform.rb]
+        s.add_runtime_dependency "sometimes_used"
+      end
+
+      fetcher.download "sometimes_used", 2 do |s|
+        s.files = %w[lib/sometimes_used.rb]
+      end
+    end
+
+    use_ui @ui do
+      util_set_arch "unknown-unknown"
+      invoke "a"
+      assert_empty @ui.error
+      assert_equal "Building native extensions. This could take a while...\na-2\nsometimes_used-2\nwith_platform-2\n", @ui.output
+    end
+
+    use_ui @ui do
+      util_set_arch @test_arch
+      invoke "a"
+      assert_empty @ui.error
+      assert_equal "a-2-#{Gem::Platform.local}\nwith_platform-2-#{Gem::Platform.local}\n", @ui.output
+    end
+  end
+
+  def test_gem_with_other_executable_name
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 2 do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump}"
+        end
+      end
+    end
+
+    util_clear_gems
+
+    use_ui @ui do
+      @cmd.invoke "a:2"
+      assert_equal "a-2\n", @ui.output
+    end
+  end
+
+  def test_gem_with_executable_error
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 2 do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "raise #{s.original_name.dump}"
+        end
+      end
+    end
+
+    util_clear_gems
+
+    use_ui @ui do
+      e = assert_raise RuntimeError do
+        @cmd.invoke "a:2"
+      end
+      assert_equal "a-2", e.message
+      assert_empty @ui.error
+    end
+  end
+
+  def test_gem_with_multiple_executables_one_match
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 2 do |s|
+        s.executables = %w[foo a]
+        s.files = %w[bin/foo bin/a lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    util_clear_gems
+
+    use_ui @ui do
+      @cmd.invoke "a:2"
+      assert_equal "a-2 a\n", @ui.output
+    end
+  end
+
+  def test_gem_with_multiple_executables_no_match
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 2 do |s|
+        s.executables = %w[foo bar]
+        s.files = %w[bin/foo bin/bar lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+
+        write_file File.join(*%W[gems #{s.original_name} bin bar]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    util_clear_gems
+
+    use_ui @ui do
+      @cmd.invoke "a:2"
+      assert_equal "a-2 foo\n", @ui.output
+    end
+  end
+
+  def test_gem_dependency_contains_executable
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 2 do |s|
+        s.executables = %w[]
+        s.files = %w[lib/a.rb]
+
+        s.add_dependency "b"
+      end
+
+      fetcher.gem "b", 2 do |s|
+        s.executables = %w[a]
+        s.files = %w[bin/a lib/b.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    util_clear_gems
+
+    use_ui @ui do
+      @cmd.invoke "a:2"
+      assert_equal "b-2 a\n", @ui.output
+    end
+  end
+
+  def test_gem_dependency_contains_other_executable
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 2 do |s|
+        s.executables = %w[]
+        s.files = %w[lib/a.rb]
+
+        s.add_dependency "b"
+      end
+
+      fetcher.gem "b", 2 do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/b.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    util_clear_gems
+
+    use_ui @ui do
+      e = assert_raise Gem::MockGemUi::TermError do
+        @cmd.invoke "a:2"
+      end
+      assert_equal 1, e.exit_code
+      assert_equal <<~ERR, @ui.error
+        ERROR:  Failed to load executable `a`, are you sure the gem `a` contains it?
+      ERR
+    end
+  end
+
+  def test_other_gem_contains_executable
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 2 do |s|
+        s.executables = %w[]
+        s.files = %w[lib/a.rb]
+      end
+
+      fetcher.gem "b", 2 do |s|
+        s.executables = %w[a]
+        s.files = %w[bin/a lib/b.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    util_clear_gems
+
+    use_ui @ui do
+      e = assert_raise Gem::MockGemUi::TermError do
+        @cmd.invoke "a:2"
+      end
+      assert_equal 1, e.exit_code
+      assert_equal <<~ERR, @ui.error
+        ERROR:  Failed to load executable `a`, are you sure the gem `a` contains it?
+      ERR
+    end
+  end
+
+  def test_missing_gem
+    spec_fetcher do |fetcher|
+    end
+
+    use_ui @ui do
+      e = assert_raise Gem::MockGemUi::TermError do
+        @cmd.invoke "a"
+      end
+      assert_equal 2, e.exit_code
+      assert_equal <<~ERR, @ui.error
+        ERROR:  Could not find a valid gem 'a' (>= 0) in any repository
+      ERR
+    end
+  end
+
+  def test_version_mismatch
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 1
+    end
+
+    util_clear_gems
+
+    use_ui @ui do
+      e = assert_raise Gem::MockGemUi::TermError do
+        @cmd.invoke "a:2"
+      end
+      assert_equal 2, e.exit_code
+      assert_equal <<~ERR, @ui.error
+        ERROR:  Could not find a valid gem 'a' (= 2) in any repository
+        ERROR:  Possible alternatives: a
+      ERR
+    end
+  end
+
+  def test_pre_argument
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 1 do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+      fetcher.gem "a", "1.1.a" do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    util_clear_gems
+
+    use_ui @ui do
+      @cmd.invoke "--pre", "a"
+      assert_equal "a-1.1.a foo\n", @ui.output
+    end
+  end
+
+  def test_pre_version_option
+    spec_fetcher do |fetcher|
+      fetcher.download "a", 1 do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+      fetcher.download "a", "1.1.a" do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    use_ui @ui do
+      @cmd.invoke "-v", ">= 0.a", "a"
+      assert_equal "a-1.1.a foo\n", @ui.output
+    end
+  end
+
+  def test_conservative_missing_gem
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 1 do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    util_clear_gems
+
+    use_ui @ui do
+      e = assert_raise Gem::MockGemUi::TermError do
+        @cmd.invoke "--verbose", "--conservative", "a:2"
+      end
+      assert_equal 2, e.exit_code
+      assert_include @ui.output, "a (= 2) not available locally"
+      assert_equal <<~ERROR, @ui.error
+        ERROR:  Could not find a valid gem 'a' (= 2) in any repository
+        ERROR:  Possible alternatives: a
+      ERROR
+    end
+  end
+
+  def test_conservative
+    spec_fetcher do |fetcher|
+      fetcher.download "a", 1 do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    use_ui @ui do
+      invoke "--verbose", "--conservative", "a"
+      assert_include @ui.output, "a (>= 0) not available locally"
+      assert_include @ui.output, "a-1 foo"
+      assert_equal %w[a-1], @installed_specs.map(&:original_name)
+    end
+
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 1 do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+
+      fetcher.download "a", 2 do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    use_ui @ui do
+      invoke "--verbose", "--conservative", "a"
+      assert_not_include @ui.output, "a (>= 0) not available locally"
+      assert_include @ui.output, "a-1 foo"
+      assert_empty @installed_specs.map(&:original_name)
+    end
+  end
+
+  def test_uses_newest_version
+    spec_fetcher do |fetcher|
+      fetcher.download "a", 1 do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    use_ui @ui do
+      invoke "a"
+      assert_include @ui.output, "a-1 foo"
+    end
+
+    spec_fetcher do |fetcher|
+      fetcher.download "a", 1 do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+
+      fetcher.download "a", 2 do |s|
+        s.executables = %w[foo]
+        s.files = %w[bin/foo lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin foo]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    use_ui @ui do
+      invoke "--verbose", "a:2"
+      refute_predicate @ui, :terminated?
+      assert_empty @ui.error
+      assert_include @ui.output, "a-2 foo"
+      assert_equal %w[a-2], @installed_specs.map(&:original_name)
+    end
+  end
+
+  def test_uses_newest_version_of_dependency
+    spec_fetcher do |fetcher|
+      fetcher.gem "a", 1 do |s|
+        s.executables = %w[]
+        s.files = %w[lib/a.rb]
+        s.add_runtime_dependency "b"
+      end
+
+      fetcher.gem "b", 1 do |s|
+        s.executables = %w[a]
+        s.files = %w[bin/a lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+
+      fetcher.download "b", 2 do |s|
+        s.executables = %w[a]
+        s.files = %w[bin/a lib/a.rb]
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    use_ui @ui do
+      invoke "a"
+      assert_include @ui.output, "b-2 a"
+      assert_equal %w[b-2], @installed_specs.map(&:original_name)
+    end
+  end
+
+  def test_gem_exec_gem_uninstall
+    spec_fetcher do |fetcher|
+      fetcher.download "a", 2 do |s|
+        s.executables = %w[a]
+        s.files = %w[bin/a lib/a.rb]
+        s.add_runtime_dependency "b"
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump}"
+        end
+      end
+
+      fetcher.download "b", 2 do |s|
+        s.files = %w[lib/b.rb]
+      end
+    end
+
+    use_ui @ui do
+      invoke "a:2"
+      assert_equal "a-2\n", @ui.output
+
+      invoke "gem", "list", "--local"
+      assert_includes @ui.output, "a (2)\n"
+      assert_includes @ui.output, "b (2)\n"
+
+      begin
+        invoke "gem", "uninstall", "--verbose", "-x", "a"
+      rescue StandardError
+        nil
+      end
+
+      assert_empty @ui.error
+      refute_includes @ui.output, "running gem exec with"
+      assert_includes @ui.output, "Successfully uninstalled a-2\n"
+
+      invoke "--verbose", "gem", "uninstall", "b"
+      assert_includes @ui.output, "Successfully uninstalled b-2\n"
+
+      invoke "gem", "list", "--local"
+      assert_empty @ui.error
+      assert_match(/\A\s*\** LOCAL GEMS \**\s*\z/m, @ui.output)
+
+      invoke "gem", "env", "GEM_HOME"
+      assert_equal "#{@gem_home}/gem_exec\n", @ui.output
+    end
+  end
+
+  def test_only_prerelease_available
+    spec_fetcher do |fetcher|
+      fetcher.download "a", "1.a" do |s|
+        s.executables = %w[a]
+        s.files = %w[lib/a.rb bin/a]
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    use_ui @ui do
+      assert_raise Gem::MockGemUi::TermError do
+        invoke "a"
+      end
+      assert_equal "ERROR:  Could not find a valid gem 'a' (>= 0) in any repository\n" \
+                   "ERROR:  Possible alternatives: a\n", @ui.error
+      assert_empty @ui.output
+      assert_empty @installed_specs
+    end
+
+    use_ui @ui do
+      invoke "a:1.a"
+      assert_empty @ui.error
+      assert_equal "a-1.a a\n", @ui.output
+      assert_equal %w[a-1.a], @installed_specs.map(&:full_name)
+    end
+
+    FileUtils.rm_rf Gem.dir
+
+    use_ui @ui do
+      invoke "--version", ">= 1.a", "a"
+      assert_empty @ui.error
+      assert_equal "a-1.a a\n", @ui.output
+      assert_equal %w[a-1.a], @installed_specs.map(&:full_name)
+    end
+
+    FileUtils.rm_rf Gem.dir
+
+    use_ui @ui do
+      invoke "--pre", "a"
+      assert_empty @ui.error
+      assert_equal "a-1.a a\n", @ui.output
+      assert_equal %w[a-1.a], @installed_specs.map(&:full_name)
+    end
+  end
+
+  def test_newer_prerelease_available
+    spec_fetcher do |fetcher|
+      fetcher.download "a", "1" do |s|
+        s.executables = %w[a]
+        s.files = %w[lib/a.rb bin/a]
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+
+      fetcher.download "a", "1.1.a" do |s|
+        s.executables = %w[a]
+        s.files = %w[lib/a.rb bin/a]
+
+        write_file File.join(*%W[gems #{s.original_name} bin a]) do |f|
+          f << "Gem.ui.say #{s.original_name.dump} + ' ' + File.basename(__FILE__)"
+        end
+      end
+    end
+
+    use_ui @ui do
+      invoke "a"
+      assert_empty @ui.error
+      assert_equal "a-1 a\n", @ui.output
+      assert_equal %w[a-1], @installed_specs.map(&:full_name)
+    end
+
+    FileUtils.rm_rf Gem.dir
+
+    use_ui @ui do
+      invoke "a:1.1.a"
+      assert_empty @ui.error
+      assert_equal "a-1.1.a a\n", @ui.output
+      assert_equal %w[a-1.1.a], @installed_specs.map(&:full_name)
+    end
+
+    FileUtils.rm_rf Gem.dir
+
+    use_ui @ui do
+      invoke "--version", ">= 1.a", "a"
+      assert_empty @ui.error
+      assert_equal "a-1.1.a a\n", @ui.output
+      assert_equal %w[a-1.1.a], @installed_specs.map(&:full_name)
+    end
+
+    FileUtils.rm_rf Gem.dir
+
+    use_ui @ui do
+      invoke "--pre", "a"
+      assert_empty @ui.error
+      assert_equal "a-1.1.a a\n", @ui.output
+      assert_equal %w[a-1.1.a], @installed_specs.map(&:full_name)
+    end
+  end
+end