1 files changed, 89 insertions, 0 deletions
diff --git a/railties/test/app_loader_test.rb b/railties/test/app_loader_test.rb
new file mode 100644
index 0000000000..5946c8fd4c
--- /dev/null
+++ b/railties/test/app_loader_test.rb
@@ -0,0 +1,89 @@
+require 'tmpdir'
+require 'abstract_unit'
+require 'rails/app_loader'
+
+class AppLoaderTest < ActiveSupport::TestCase
+  def loader
+    @loader ||= Class.new do
+      extend Rails::AppLoader
+
+      def self.exec_arguments
+        @exec_arguments
+      end
+
+      def self.exec(*args)
+        @exec_arguments = args
+      end
+    end
+  end
+
+  def write(filename, contents=nil)
+    FileUtils.mkdir_p(File.dirname(filename))
+    File.write(filename, contents)
+  end
+
+  def expects_exec(exe)
+    assert_equal [Rails::AppLoader::RUBY, exe], loader.exec_arguments
+  end
+
+  setup do
+    @tmp = Dir.mktmpdir('railties-rails-loader-test-suite')
+    @cwd = Dir.pwd
+    Dir.chdir(@tmp)
+  end
+
+  ['bin', 'script'].each do |script_dir|
+    exe = "#{script_dir}/rails"
+
+    test "is not in a Rails application if #{exe} is not found in the current or parent directories" do
+      def loader.find_executables; end
+
+      assert !loader.exec_app
+    end
+
+    test "is not in a Rails application if #{exe} exists but is a folder" do
+      FileUtils.mkdir_p(exe)
+
+      assert !loader.exec_app
+    end
+
+    ['APP_PATH', 'ENGINE_PATH'].each do |keyword|
+      test "is in a Rails application if #{exe} exists and contains #{keyword}" do
+        write exe, keyword
+
+        loader.exec_app
+
+        expects_exec exe
+      end
+
+      test "is not in a Rails application if #{exe} exists but doesn't contain #{keyword}" do
+        write exe
+
+        assert !loader.exec_app
+      end
+
+      test "is in a Rails application if parent directory has #{exe} containing #{keyword} and chdirs to the root directory" do
+        write "foo/bar/#{exe}"
+        write "foo/#{exe}", keyword
+
+        Dir.chdir('foo/bar')
+
+        loader.exec_app
+
+        expects_exec exe
+
+        # Compare the realpath in case either of them has symlinks.
+        #
+        # This happens in particular in Mac OS X, where @tmp starts
+        # with "/var", and Dir.pwd with "/private/var", due to a
+        # default system symlink var -> private/var.
+        assert_equal File.realpath("#@tmp/foo"), File.realpath(Dir.pwd)
+      end
+    end
+  end
+
+  teardown do
+    Dir.chdir(@cwd)
+    FileUtils.rm_rf(@tmp)
+  end
+end