TST: Test CustomBusinessHour resampling (pandas-dev#12351)

follow up to GH16447

Author: Younggun Kim

pandas/tests/test_resample.py

@@ -2564,21 +2564,36 @@ def test_upsample_daily_business_daily(self):
         expected = ts.asfreq('H', how='s').reindex(exp_rng)
         assert_series_equal(result, expected)
 
-
-    # GH12351
     def test_resample_business_hourly(self):
+        # GH12351
         rng = pd.date_range(start='2017-05-18 00:00:00',
                             end='2017-05-19 23:00:00',
                             freq='H')
         expected_rng = pd.date_range(start='2017-05-18 00:00:00',
-                                    end='2017-05-19 23:00:00',
-                                    freq='BH')
+                                     end='2017-05-19 23:00:00',
+                                     freq='BH')
         ts = Series(1, index=rng)
         result = ts.asfreq('BH')
         expected_ts = Series(1, index=expected_rng)
 
         assert_series_equal(result, expected_ts)
 
+    def test_resample_custom_business_hourly(self):
+        # GH12351
+        rng = pd.date_range(start='2017-05-18 00:00:00',
+                            end='2017-05-19 23:00:00',
+                            freq='H')
+
+        hours = offsets.CustomBusinessHour(start='10:00')
+        expected_rng = pd.date_range(start='2017-05-18 00:00:00',
+                                     end='2017-05-19 23:00:00',
+                                     freq=hours)
+
+        ts = Series(1, index=rng)
+        result = ts.asfreq(hours)
+        expected_ts = Series(1, index=expected_rng)
+
+        assert_series_equal(result, expected_ts)
 
     def test_resample_irregular_sparse(self):
         dr = date_range(start='1/1/2012', freq='5min', periods=1000)