Remove duplicated test case

Author: Alex Schworer

test/test_zencoder.py

@@ -40,12 +40,6 @@ def test_zero_content_length(self):
         content = None
         self.assertEquals(zc.job.content_length(content), "0")
 
-    def test_zero_content_length(self):
-        os.environ['ZENCODER_API_KEY'] = 'abcd123'
-        zc = Zencoder()
-        content = "foobar"
-        self.assertEquals(zc.job.content_length(content), "6")
-
 if __name__ == "__main__":
     unittest.main()