1 files changed, 85 insertions, 0 deletions
diff --git a/railties/test/initializer/install_gem_spec_stubs_test.rb b/railties/test/initializer/install_gem_spec_stubs_test.rb
new file mode 100644
index 0000000000..2e94c9968f
--- /dev/null
+++ b/railties/test/initializer/install_gem_spec_stubs_test.rb
@@ -0,0 +1,85 @@
+require "initializer/test_helper"
+
+module InitializerTests
+  class GemSpecStubsTest < ActiveSupport::TestCase
+    include ActiveSupport::Testing::Isolation
+
+    def setup
+      $stderr = StringIO.new
+    end
+
+    test "user has an old boot.rb (defined by having no Rails.vendor_rails?)" do
+      class << Rails
+        undef vendor_rails?
+      end
+
+      assert_stderr(/outdated/) do
+        assert_raises(SystemExit) do
+          Rails::Initializer.run { |c| c.frameworks = [] }
+        end
+      end
+    end
+
+    test "requires rubygems" do
+      Kernel.module_eval do
+        alias old_require require
+        def require(name)
+          $rubygems_required = true if name == "rubygems"
+          old_require(name)
+        end
+      end
+
+      Rails.vendor_rails = true
+      Rails::Initializer.run { |c| c.frameworks = [] }
+      assert $rubygems_required
+    end
+
+    test "does not fail if rubygems does not exist" do
+      Kernel.module_eval do
+        alias old_require require
+        def require(name)
+          raise LoadError if name == "rubygems"
+          old_require(name)
+        end
+      end
+
+      assert_nothing_raised do
+        Rails::Initializer.run { |c| c.frameworks = [] }
+      end
+    end
+
+    test "adds fake Rubygems stubs if a framework is not loaded in Rubygems and we've vendored" do
+      Rails.vendor_rails = true
+
+      Rails::Initializer.run { |c| c.frameworks = [] }
+
+      %w(rails activesupport activerecord actionpack actionmailer activeresource).each do |stub|
+        gem_spec = Gem.loaded_specs[stub]
+        assert_equal Gem::Version.new(Rails::VERSION::STRING), gem_spec.version
+        assert_equal stub, gem_spec.name
+        assert_equal "", gem_spec.loaded_from
+      end
+    end
+
+    test "doesn't replace gem specs that are already loaded" do
+      Rails.vendor_rails = true
+
+      Gem.loaded_specs["rails"] = Gem::Specification.new do |s|
+        s.name = "rails"
+        s.version = Rails::VERSION::STRING
+        s.loaded_from = "/foo/bar/baz"
+      end
+
+      Rails::Initializer.run { |c| c.frameworks = [] }
+
+      assert_equal "/foo/bar/baz", Gem.loaded_specs["rails"].loaded_from
+
+      %w(activesupport activerecord actionpack actionmailer activeresource).each do |stub|
+        gem_spec = Gem.loaded_specs[stub]
+        assert_equal Gem::Version.new(Rails::VERSION::STRING), gem_spec.version
+        assert_equal stub, gem_spec.name
+        assert_equal "", gem_spec.loaded_from
+      end
+    end
+  end
+end
+\ No newline at end of file