diff --git a/test/functional/basic.rb b/test/functional/basic.rb
index cc99e836..441eec0a 100644
--- a/test/functional/basic.rb
+++ b/test/functional/basic.rb
@@ -166,16 +166,16 @@ def test_supported_languages_should_include_languages
   
   def test_supported_languages_without_arguments_should_include_aliases_and_exclude_internals
     assert CodeRay.supported_languages.include?(:javascript)
-    refute CodeRay.supported_languages.include?(:debug)
+    assert !CodeRay.supported_languages.include?(:debug)
   end
   
   def test_supported_languages_with_arguments_should_include_aliases_and_exclude_internals
     assert CodeRay.supported_languages(true, false).include?(:javascript)
-    refute CodeRay.supported_languages(true, false).include?(:debug)
+    assert !CodeRay.supported_languages(true, false).include?(:debug)
   end
   
   def test_supported_languages_with_arguments_should_exclude_aliases_and_include_internals
-    refute CodeRay.supported_languages(false, true).include?(:javascript)
+    assert !CodeRay.supported_languages(false, true).include?(:javascript)
     assert CodeRay.supported_languages(false, true).include?(:debug)
   end
   
@@ -185,8 +185,8 @@ def test_supported_languages_with_arguments_should_include_aliases_and_internals
   end
   
   def test_supported_languages_with_arguments_should_exclude_aliases_and_internals
-    refute CodeRay.supported_languages(false, false).include?(:javascript)
-    refute CodeRay.supported_languages(false, false).include?(:debug)
+    assert !CodeRay.supported_languages(false, false).include?(:javascript)
+    assert !CodeRay.supported_languages(false, false).include?(:debug)
   end
   
   def test_token_kinds