1 files changed, 41 insertions, 0 deletions
diff --git a/railties/test/app_rails_loader_test.rb b/railties/test/app_rails_loader_test.rb
new file mode 100644
index 0000000000..87e0ad7bd7
--- /dev/null
+++ b/railties/test/app_rails_loader_test.rb
@@ -0,0 +1,41 @@
+require 'abstract_unit'
+require 'rails/app_rails_loader'
+
+class AppRailsLoaderTest < ActiveSupport::TestCase
+  test "is in a rails application if bin/rails exists and contains APP_PATH" do
+    File.stubs(:exists?).returns(true)
+    File.stubs(:read).with('bin/rails').returns('APP_PATH')
+    assert Rails::AppRailsLoader.in_rails_application_or_engine?
+  end
+
+  test "is not in a rails application if bin/rails exists but doesn't contain APP_PATH" do
+    File.stubs(:exists?).returns(true)
+    File.stubs(:read).with('bin/rails').returns('railties bin/rails')
+    assert !Rails::AppRailsLoader.in_rails_application_or_engine?
+  end
+
+  test "is in a rails application if parent directory has bin/rails containing APP_PATH" do
+    File.stubs(:exists?).with("/foo/bar/bin/rails").returns(false)
+    File.stubs(:exists?).with("/foo/bin/rails").returns(true)
+    File.stubs(:read).with('/foo/bin/rails').returns('APP_PATH')
+    assert Rails::AppRailsLoader.in_rails_application_or_engine_subdirectory?(Pathname.new("/foo/bar"))
+  end
+
+  test "is not in a rails application if at the root directory and doesn't have bin/rails" do
+    Pathname.any_instance.stubs(:root?).returns true
+    assert !Rails::AppRailsLoader.in_rails_application_or_engine?
+  end
+
+  test "is in a rails engine if parent directory has bin/rails containing ENGINE_PATH" do
+    File.stubs(:exists?).with("/foo/bar/bin/rails").returns(false)
+    File.stubs(:exists?).with("/foo/bin/rails").returns(true)
+    File.stubs(:read).with('/foo/bin/rails').returns('ENGINE_PATH')
+    assert Rails::AppRailsLoader.in_rails_application_or_engine_subdirectory?(Pathname.new("/foo/bar"))
+  end
+
+  test "is in a rails engine if bin/rails exists containing ENGINE_PATH" do
+    File.stubs(:exists?).returns(true)
+    File.stubs(:read).with('bin/rails').returns('ENGINE_PATH')
+    assert Rails::AppRailsLoader.in_rails_application_or_engine?
+  end
+end