add test for removing constants that are already removed

padrino-core/test/fixtures/dependencies/gc/t.rb

@@ -0,0 +1,5 @@
+Padrino.require_dependencies(
+  Padrino.root("fixtures/dependencies/gc/v.rb"),
+  Padrino.root("fixtures/dependencies/gc/w.rb"),
+  Padrino.root("fixtures/dependencies/gc/x.rb")
+)

padrino-core/test/fixtures/dependencies/gc/u.rb

@@ -0,0 +1,3 @@
+Padrino.require_dependencies(
+  Padrino.root("fixtures/dependencies/gc/y.rb")
+)

padrino-core/test/fixtures/dependencies/gc/v.rb

@@ -0,0 +1,10 @@
+class V
+  $prevent_from_being_gced ||= []
+  $prevent_from_being_gced.push(self)
+
+  def self.hello
+    "hello"
+  end
+
+  W
+end

padrino-core/test/fixtures/dependencies/gc/w.rb

@@ -0,0 +1,2 @@
+class W
+end

padrino-core/test/fixtures/dependencies/gc/x.rb

@@ -0,0 +1,2 @@
+class X < Y
+end

padrino-core/test/fixtures/dependencies/gc/y.rb

@@ -0,0 +1,2 @@
+class Y
+end

padrino-core/test/test_dependencies.rb

@@ -77,6 +77,16 @@
       assert_equal "hello", M.hello
     end
 
+    it 'should not remove constants that are already `remove_const`ed' do
+      capture_io do
+        Padrino.require_dependencies(
+          Padrino.root("fixtures/dependencies/gc/t.rb"),
+          Padrino.root("fixtures/dependencies/gc/u.rb")
+        )
+      end
+      assert_equal "hello", V.hello
+    end
+
 
     describe "change log level for :devel" do
       before do