includes valid module name in go.mod

Author: sue445

bundler/lib/bundler/cli/gem.rb

@@ -16,6 +16,8 @@ class CLI::Gem
       "test-unit" => "3.0",
     }.freeze
 
+    DEFAULT_GITHUB_USERNAME = "[USERNAME]"
+
     attr_reader :options, :gem_name, :thor, :name, :target, :extension
 
     def initialize(options, gem_name, thor)
@@ -72,7 +74,7 @@ def run
         exe: options[:exe],
         bundler_version: bundler_dependency_version,
         git: use_git,
-        github_username: github_username.empty? ? "[USERNAME]" : github_username,
+        github_username: github_username.empty? ? DEFAULT_GITHUB_USERNAME : github_username,
         required_ruby_version: required_ruby_version,
         rust_builder_required_rubygems_version: rust_builder_required_rubygems_version,
         minitest_constant_name: minitest_constant_name,
@@ -223,6 +225,7 @@ def run
         )
 
         config[:go_version] = go_version
+        config[:go_module_username] = config[:github_username] == DEFAULT_GITHUB_USERNAME ? "username" : config[:github_username]
       end
 
       if target.exist? && !target.directory?

bundler/lib/bundler/templates/newgem/ext/newgem/go.mod.tt

@@ -1,4 +1,4 @@
-module github.com/<%= config[:github_username] %>/<%= config[:underscored_name] %>
+module github.com/<%= config[:go_module_username] %>/<%= config[:underscored_name] %>
 
 go <%= config[:go_version] %>
 

bundler/spec/commands/newgem_spec.rb

@@ -1668,6 +1668,10 @@ def create_temporary_dir(dir)
         GO
       end
 
+      it "includes valid module name in go.mod" do
+        expect(bundled_app("#{gem_name}/ext/#{gem_name}/go.mod").read).to include("module github.com/bundleuser/#{gem_name}")
+      end
+
       context "with --no-ci" do
         let(:flags) { "--ext=go --no-ci" }
 
@@ -1737,6 +1741,17 @@ def create_temporary_dir(dir)
           expect(bundled_app("#{gem_name}/ext/#{gem_name}/go.mod").read).to include("go #{go_version}")
         end
       end
+
+      context "without github.user" do
+        before do
+          git("config --global --unset github.user")
+          bundle ["gem", gem_name, flags].compact.join(" ")
+        end
+
+        it "includes valid module name in go.mod" do
+          expect(bundled_app("#{gem_name}/ext/#{gem_name}/go.mod").read).to include("module github.com/username/#{gem_name}")
+        end
+      end
     end
   end