1 files changed, 109 insertions, 0 deletions
diff --git a/spec/bundler/install/gemfile/ruby_spec.rb b/spec/bundler/install/gemfile/ruby_spec.rb
new file mode 100644
index 0000000000..b9d9683758
--- /dev/null
+++ b/spec/bundler/install/gemfile/ruby_spec.rb
@@ -0,0 +1,109 @@
+# frozen_string_literal: true
+require "spec_helper"
+
+RSpec.describe "ruby requirement" do
+  def locked_ruby_version
+    Bundler::RubyVersion.from_string(Bundler::LockfileParser.new(lockfile).ruby_version)
+  end
+
+  # As discovered by https://github.com/bundler/bundler/issues/4147, there is
+  # no test coverage to ensure that adding a gem is possible with a ruby
+  # requirement. This test verifies the fix, committed in bfbad5c5.
+  it "allows adding gems" do
+    install_gemfile <<-G
+      source "file://#{gem_repo1}"
+      ruby "#{RUBY_VERSION}"
+      gem "rack"
+    G
+
+    install_gemfile <<-G
+      source "file://#{gem_repo1}"
+      ruby "#{RUBY_VERSION}"
+      gem "rack"
+      gem "rack-obama"
+    G
+
+    expect(exitstatus).to eq(0) if exitstatus
+    expect(the_bundle).to include_gems "rack-obama 1.0"
+  end
+
+  it "allows removing the ruby version requirement" do
+    install_gemfile <<-G
+      source "file://#{gem_repo1}"
+      ruby "~> #{RUBY_VERSION}"
+      gem "rack"
+    G
+
+    expect(lockfile).to include("RUBY VERSION")
+
+    install_gemfile <<-G
+      source "file://#{gem_repo1}"
+      gem "rack"
+    G
+
+    expect(the_bundle).to include_gems "rack 1.0.0"
+    expect(lockfile).not_to include("RUBY VERSION")
+  end
+
+  it "allows changing the ruby version requirement to something compatible" do
+    install_gemfile <<-G
+      source "file://#{gem_repo1}"
+      ruby ">= 1.0.0"
+      gem "rack"
+    G
+
+    expect(locked_ruby_version).to eq(Bundler::RubyVersion.system)
+
+    simulate_ruby_version "5100"
+
+    install_gemfile <<-G
+      source "file://#{gem_repo1}"
+      ruby ">= 1.0.1"
+      gem "rack"
+    G
+
+    expect(the_bundle).to include_gems "rack 1.0.0"
+    expect(locked_ruby_version).to eq(Bundler::RubyVersion.system)
+  end
+
+  it "allows changing the ruby version requirement to something incompatible" do
+    install_gemfile <<-G
+      source "file://#{gem_repo1}"
+      ruby ">= 1.0.0"
+      gem "rack"
+    G
+
+    expect(locked_ruby_version).to eq(Bundler::RubyVersion.system)
+
+    simulate_ruby_version "5100"
+
+    install_gemfile <<-G
+      source "file://#{gem_repo1}"
+      ruby ">= 5000.0"
+      gem "rack"
+    G
+
+    expect(the_bundle).to include_gems "rack 1.0.0"
+    expect(locked_ruby_version.versions).to eq(["5100"])
+  end
+
+  it "allows requirements with trailing whitespace" do
+    install_gemfile! <<-G
+      source "file://#{gem_repo1}"
+      ruby "#{RUBY_VERSION}\\n \t\\n"
+      gem "rack"
+    G
+
+    expect(the_bundle).to include_gems "rack 1.0.0"
+  end
+
+  it "fails gracefully with malformed requirements" do
+    install_gemfile <<-G
+      source "file://#{gem_repo1}"
+      ruby ">= 0", "-.\\0"
+      gem "rack"
+    G
+
+    expect(out).to include("There was an error parsing") # i.e. DSL error, not error template
+  end
+end