[ruby/rubygems] Add version: nil integration coverage

Verify end-to-end that override(..., version: nil) collapses the
requirement to Gem::Requirement.default for both direct deps (a
Gemfile pin to 0.9.1 is removed) and transitive deps (a
myrack_middleware-imposed = 0.9.1 floor is removed).

https://github.com/ruby/rubygems/commit/7df463f5c7

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/spec/bundler/install/gemfile/override_spec.rb b/spec/bundler/install/gemfile/override_spec.rb
index 0b5f868d42..8a00186d60 100644
--- a/spec/bundler/install/gemfile/override_spec.rb
+++ b/spec/bundler/install/gemfile/override_spec.rb
@@ -88,4 +88,26 @@ RSpec.describe "override DSL" do
       expect(the_bundle).to include_gems "myrack 1.0.0"
     end
   end
+
+  context "with a version: nil operation" do
+    it "drops a direct dependency's pin entirely" do
+      install_gemfile <<-G
+        source "https://gem.repo1"
+        override "myrack", version: nil
+        gem "myrack", "= 0.9.1"
+      G
+
+      expect(the_bundle).to include_gems "myrack 1.0.0"
+    end
+
+    it "drops a transitive dependency's pin entirely" do
+      install_gemfile <<-G
+        source "https://gem.repo1"
+        override "myrack", version: nil
+        gem "myrack_middleware"
+      G
+
+      expect(the_bundle).to include_gems "myrack 1.0.0", "myrack_middleware 1.0"
+    end
+  end
 end