lazy compiler tests

tests/tests/compiler.py

 from django.test import TestCase
 
+from pipeline.compilers import Compiler
+
 
 class CompilerTest(TestCase):
-    pass
+    def setUp(self):
+        self.compiler = Compiler()
+
+    def test_output_path(self):
+        output_path = self.compiler.output_path("js/helpers.coffee", "js")
+        self.assertEquals(output_path, "js/helpers.js")