1 files changed, 21 insertions, 0 deletions
diff --git a/railties/test/gem_dependency_test.rb b/railties/test/gem_dependency_test.rb
index da7bda9bee..4ff4fe8d43 100644
--- a/railties/test/gem_dependency_test.rb
+++ b/railties/test/gem_dependency_test.rb
@@ -145,4 +145,25 @@ class GemDependencyTest < Test::Unit::TestCase
     end
   end
 
+  def test_gem_from_directory_name
+    dummy_gem = Rails::GemDependency.from_directory_name('dummy-gem-1.1')
+    assert_equal 'dummy-gem', dummy_gem.name
+    assert_equal '= 1.1',     dummy_gem.version_requirements.to_s
+  end
+
+  def test_gem_from_invalid_directory_name
+    assert_raises RuntimeError do
+      dummy_gem = Rails::GemDependency.from_directory_name('dummy-gem')
+    end
+    assert_raises RuntimeError do
+      dummy_gem = Rails::GemDependency.from_directory_name('dummy')
+    end
+  end
+
+  def test_gem_determines_build_status
+    assert_equal true,  Rails::GemDependency.new("dummy-gem-a").built?
+    assert_equal true,  Rails::GemDependency.new("dummy-gem-i").built?
+    assert_equal false, Rails::GemDependency.new("dummy-gem-j").built?
+  end
+
 end