diff --git a/bundler/lib/bundler/templates/newgem/Gemfile.tt b/bundler/lib/bundler/templates/newgem/Gemfile.tt
index b57050caf0a5..1d55fd7a90b8 100644
--- a/bundler/lib/bundler/templates/newgem/Gemfile.tt
+++ b/bundler/lib/bundler/templates/newgem/Gemfile.tt
@@ -7,11 +7,14 @@ gemspec
 
 gem "rake", "~> 13.0"
 <%- if config[:ext] -%>
+
 gem "rake-compiler"
 <%- end -%>
 <%- if config[:test] -%>
+
 gem "<%= config[:test] %>", "~> <%= config[:test_framework_version] %>"
 <%- end -%>
 <%- if config[:rubocop] -%>
+
 gem "rubocop", "~> 0.80"
 <%- end -%>
diff --git a/bundler/lib/bundler/templates/newgem/Rakefile.tt b/bundler/lib/bundler/templates/newgem/Rakefile.tt
index 57222f8c5605..5393eb4e22bc 100644
--- a/bundler/lib/bundler/templates/newgem/Rakefile.tt
+++ b/bundler/lib/bundler/templates/newgem/Rakefile.tt
@@ -36,4 +36,8 @@ Rake::ExtensionTask.new("<%= config[:underscored_name] %>") do |ext|
 end
 
 <% end -%>
-task default: <%= default_task_names.size == 1 ? default_task_names.first.inspect : default_task_names.inspect %>
+<% if default_task_names.size == 1 -%>
+task default: <%= default_task_names.first.inspect %>
+<% else -%>
+task default: %i[<%= default_task_names.join(" ") %>]
+<% end -%>
diff --git a/bundler/lib/bundler/templates/newgem/ext/newgem/extconf.rb.tt b/bundler/lib/bundler/templates/newgem/ext/newgem/extconf.rb.tt
index 8cfc828f94f9..e918063ddf68 100644
--- a/bundler/lib/bundler/templates/newgem/ext/newgem/extconf.rb.tt
+++ b/bundler/lib/bundler/templates/newgem/ext/newgem/extconf.rb.tt
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "mkmf"
 
 create_makefile(<%= config[:makefile_path].inspect %>)
diff --git a/bundler/lib/bundler/templates/newgem/test/minitest/newgem_test.rb.tt b/bundler/lib/bundler/templates/newgem/test/minitest/newgem_test.rb.tt
index f2af9f90e0ba..9e005d69a80b 100644
--- a/bundler/lib/bundler/templates/newgem/test/minitest/newgem_test.rb.tt
+++ b/bundler/lib/bundler/templates/newgem/test/minitest/newgem_test.rb.tt
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "test_helper"
 
 class <%= config[:constant_name] %>Test < Minitest::Test
diff --git a/bundler/lib/bundler/templates/newgem/test/minitest/test_helper.rb.tt b/bundler/lib/bundler/templates/newgem/test/minitest/test_helper.rb.tt
index 7d7db165ecb6..e05c387bfae8 100644
--- a/bundler/lib/bundler/templates/newgem/test/minitest/test_helper.rb.tt
+++ b/bundler/lib/bundler/templates/newgem/test/minitest/test_helper.rb.tt
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 $LOAD_PATH.unshift File.expand_path("../lib", __dir__)
 require "<%= config[:namespaced_path] %>"
 
diff --git a/bundler/lib/bundler/templates/newgem/test/test-unit/newgem_test.rb.tt b/bundler/lib/bundler/templates/newgem/test/test-unit/newgem_test.rb.tt
index e653993006ae..5c61094e623a 100644
--- a/bundler/lib/bundler/templates/newgem/test/test-unit/newgem_test.rb.tt
+++ b/bundler/lib/bundler/templates/newgem/test/test-unit/newgem_test.rb.tt
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "test_helper"
 
 class <%= config[:constant_name] %>Test < Test::Unit::TestCase
diff --git a/bundler/lib/bundler/templates/newgem/test/test-unit/test_helper.rb.tt b/bundler/lib/bundler/templates/newgem/test/test-unit/test_helper.rb.tt
index 461ee391a52d..6f633c60396a 100644
--- a/bundler/lib/bundler/templates/newgem/test/test-unit/test_helper.rb.tt
+++ b/bundler/lib/bundler/templates/newgem/test/test-unit/test_helper.rb.tt
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 $LOAD_PATH.unshift File.expand_path("../lib", __dir__)
 require "<%= config[:namespaced_path] %>"
 
diff --git a/bundler/spec/commands/newgem_spec.rb b/bundler/spec/commands/newgem_spec.rb
index 16ce9def37f0..7dca5f518885 100644
--- a/bundler/spec/commands/newgem_spec.rb
+++ b/bundler/spec/commands/newgem_spec.rb
@@ -10,6 +10,15 @@ def gem_skeleton_assertions
     expect(bundled_app("#{gem_name}/lib/#{require_path}/version.rb")).to exist
   end
 
+  def bundle_exec_rubocop
+    prepare_gemspec(bundled_app(gem_name, "#{gem_name}.gemspec"))
+    rubocop_version = RUBY_VERSION > "2.4" ? "0.85.1" : "0.80.1"
+    gems = ["minitest", "rake", "rake-compiler", "rspec", "rubocop -v #{rubocop_version}", "test-unit"]
+    path = Bundler.feature_flag.default_install_uses_path? ? local_gem_path(:base => bundled_app(gem_name)) : system_gem_path
+    realworld_system_gems gems, :path => path
+    bundle "exec rubocop --config .rubocop.yml", :dir => bundled_app(gem_name)
+  end
+
   let(:generated_gemspec) { Bundler.load_gemspec_uncached(bundled_app(gem_name).join("#{gem_name}.gemspec")) }
 
   let(:gem_name) { "mygem" }
@@ -174,17 +183,6 @@ def gem_skeleton_assertions
     it "generates a default .rubocop.yml" do
       expect(bundled_app("#{gem_name}/.rubocop.yml")).to exist
     end
-
-    it "runs rubocop inside the generated gem with no offenses" do
-      skip "ruby_core has an 'ast.rb' file that gets in the middle and breaks this spec" if ruby_core?
-      prepare_gemspec(bundled_app(gem_name, "#{gem_name}.gemspec"))
-      rubocop_version = RUBY_VERSION > "2.4" ? "0.85.1" : "0.80.1"
-      gems = ["rake", "rubocop -v #{rubocop_version}"]
-      path = Bundler.feature_flag.default_install_uses_path? ? local_gem_path(:base => bundled_app(gem_name)) : system_gem_path
-      realworld_system_gems gems, :path => path
-      bundle "exec rubocop --config .rubocop.yml", :dir => bundled_app(gem_name)
-      expect(err).to be_empty
-    end
   end
 
   shared_examples_for "--no-rubocop flag" do
@@ -214,6 +212,41 @@ def gem_skeleton_assertions
     end
   end
 
+  it "has no rubocop offenses when using --rubocop flag", :readline do
+    skip "ruby_core has an 'ast.rb' file that gets in the middle and breaks this spec" if ruby_core?
+    bundle "gem #{gem_name} --rubocop"
+    bundle_exec_rubocop
+    expect(err).to be_empty
+  end
+
+  it "has no rubocop offenses when using --ext and --rubocop flag", :readline do
+    skip "ruby_core has an 'ast.rb' file that gets in the middle and breaks this spec" if ruby_core?
+    bundle "gem #{gem_name} --ext --rubocop"
+    bundle_exec_rubocop
+    expect(err).to be_empty
+  end
+
+  it "has no rubocop offenses when using --ext, --test=minitest, and --rubocop flag", :readline do
+    skip "ruby_core has an 'ast.rb' file that gets in the middle and breaks this spec" if ruby_core?
+    bundle "gem #{gem_name} --ext --test=minitest --rubocop"
+    bundle_exec_rubocop
+    expect(err).to be_empty
+  end
+
+  it "has no rubocop offenses when using --ext, --test=rspec, and --rubocop flag", :readline do
+    skip "ruby_core has an 'ast.rb' file that gets in the middle and breaks this spec" if ruby_core?
+    bundle "gem #{gem_name} --ext --test=rspec --rubocop"
+    bundle_exec_rubocop
+    expect(err).to be_empty
+  end
+
+  it "has no rubocop offenses when using --ext, --ext=test-unit, and --rubocop flag", :readline do
+    skip "ruby_core has an 'ast.rb' file that gets in the middle and breaks this spec" if ruby_core?
+    bundle "gem #{gem_name} --ext --test=test-unit --rubocop"
+    bundle_exec_rubocop
+    expect(err).to be_empty
+  end
+
   shared_examples_for "CI config is absent" do
     it "does not create any CI files" do
       expect(bundled_app("#{gem_name}/.github/workflows/main.yml")).to_not exist
@@ -914,7 +947,7 @@ def create_temporary_dir(dir)
             ext.lib_dir = "lib/#{gem_name}"
           end
 
-          task default: [:clobber, :compile]
+          task default: %i[clobber compile]
         RAKEFILE
 
         expect(bundled_app("#{gem_name}/Rakefile").read).to eq(rakefile)