TST: skip compression tests if either gzip/bz2 not built with user's python. close #2424

Author: wesm

pandas/io/tests/test_parsers.py

@@ -1799,12 +1799,14 @@ def test_pure_python_failover(self):
         tm.assert_frame_equal(result, expected)
 
     def test_decompression(self):
-        data = open(self.csv1, 'rb').read()
+        try:
+            import gzip, bz2
+        except ImportError:
+            raise nose.SkipTest
 
+        data = open(self.csv1, 'rb').read()
         expected = self.read_csv(self.csv1)
 
-        import gzip, bz2
-
         try:
             tmp = gzip.GzipFile('__tmp__', mode='wb')
             tmp.write(data)