TST: Tests for fillna on empty Series (GH4346), thanks @immerrr

Author: jreback

doc/source/release.rst

@@ -452,6 +452,7 @@ Bug Fixes
   - Fixed string methods for ``FrozenNDArray`` and ``FrozenList`` (:issue:`4929`)
   - Fixed a bug with setting invalid or out-of-range values in indexing
     enlargement scenarios (:issue:`4940`)
+  - Tests for fillna on empty Series (:issue:`4346`), thanks @immerrr
 
 pandas 0.12.0
 -------------

pandas/tests/test_series.py

@@ -4599,6 +4599,19 @@ def test_fillna_inplace(self):
         expected = x.fillna(value=0)
         assert_series_equal(y, expected)
 
+    def test_fillna_empty(self):
+        # GH 4346
+
+        empty = Series()
+
+        result = empty.reindex([1, 2, 3])
+        expected = Series([np.nan, np.nan, np.nan], index=[1, 2, 3])
+        assert_series_equal(result, expected)
+
+        result = empty.reindex([1, 2, 3], fill_value=0.0)
+        expected = Series([0.0, 0.0, 0.0], index=[1, 2, 3])
+        assert_series_equal(result, expected)
+
     def test_fillna_invalid_method(self):
         try:
             self.ts.fillna(method='ffil')