improving test coverage

.gitignore

@@ -9,4 +9,5 @@ MANIFEST
 docs/_build/
 *.egg-info
 .coverage
-htmlcov/
\ No newline at end of file
+coverage/
+tests/static/js/dummy.js

tests/static/js/dummy.coffee

+square = (x) -> x * x
+cube   = (x) -> square(x) * x

tests/tests/compiler.py

 from django.test import TestCase
 
-from pipeline.compilers import Compiler
+from pipeline.conf import settings
+from pipeline.compilers import Compiler, CompilerBase
+
+
+class DummyCompiler(CompilerBase):
+    output_extension = 'js'
+
+    def match_file(self, path):
+        return path.endswith('.coffee')
+
+    def compile_file(self, content):
+        return content
 
 
 class CompilerTest(TestCase):
     def setUp(self):
         self.compiler = Compiler()
+        self.old_compilers = settings.PIPELINE_COMPILERS
+        settings.PIPELINE_COMPILERS = ['tests.tests.compiler.DummyCompiler',]
 
     def test_output_path(self):
         output_path = self.compiler.output_path("js/helpers.coffee", "js")
         self.assertEquals(output_path, "js/helpers.js")
+
+    def test_compilers_class(self):
+        compilers_class = self.compiler.compilers
+        self.assertEquals(compilers_class[0], DummyCompiler)
+
+    def test_compile(self):
+        paths = self.compiler.compile([
+            'js/dummy.coffee',
+            'js/application.js',
+        ])
+        self.assertEquals(['js/dummy.js', 'js/application.js'], paths)
+
+    def tearDown(self):
+        settings.PIPELINE_COMPILERS = self.old_compilers