Newly generated gems require Ruby 2.6.0

In 2021, Ruby 2.5 and older are EOL.
We can set the default required Ruby version to 2.6.0 to
encourage people to use newer Ruby.
If the command is executed with old Ruby, it falls back to 2.3.0.
It's still possible to create a gem for older Ruby just by changing
two lines of code (one in gemspec and another is in rubocop.yml).

2 files changed, 17 insertions, 3 deletions

diff --git a/spec/bundler/commands/newgem_spec.rb b/spec/bundler/commands/newgem_spec.rb
index 0a4e683a04..5ba513861c 100644
--- a/spec/bundler/commands/newgem_spec.rb
+++ b/spec/bundler/commands/newgem_spec.rb
@@ -569,7 +569,7 @@ RSpec.describe "bundle gem" do
     it "sets a minimum ruby version" do
       bundle "gem #{gem_name}"
 
-      expect(generated_gemspec.required_ruby_version).to eq(Gem::Requirement.new(Gem.ruby_version < Gem::Version.new("2.4.a") ? ">= 2.3.0" : ">= 2.4.0"))
+      expect(generated_gemspec.required_ruby_version.to_s).to start_with(">=")
     end
 
     it "requires the version file" do
diff --git a/spec/bundler/support/path.rb b/spec/bundler/support/path.rb
index a98ef7c6cf..a73b3e699e 100644
--- a/spec/bundler/support/path.rb
+++ b/spec/bundler/support/path.rb
@@ -283,11 +283,25 @@ module Spec
     end
 
     def rubocop_gemfile_basename
-      source_root.join("tool/bundler/#{RUBY_VERSION.start_with?("2.3") ? "rubocop23_gems.rb" : "rubocop_gems.rb"}")
+      filename = if RUBY_VERSION.start_with?("2.3")
+        "rubocop23_gems"
+      elsif RUBY_VERSION.start_with?("2.4")
+        "rubocop24_gems"
+      else
+        "rubocop_gems"
+      end
+      source_root.join("tool/bundler/#{filename}.rb")
     end
 
     def standard_gemfile_basename
-      source_root.join("tool/bundler/#{RUBY_VERSION.start_with?("2.3") ? "standard23_gems.rb" : "standard_gems.rb"}")
+      filename = if RUBY_VERSION.start_with?("2.3")
+        "standard23_gems"
+      elsif RUBY_VERSION.start_with?("2.4")
+        "standard24_gems"
+      else
+        "standard_gems"
+      end
+      source_root.join("tool/bundler/#{filename}.rb")
     end
 
     extend self