TST: Additional Styler init and repr tests

Author: TomAugspurger

pandas/formats/style.py

@@ -133,7 +133,7 @@ def __init__(self, data, precision=None, table_styles=None, uuid=None,
         self._todo = []
 
         if not isinstance(data, (pd.Series, pd.DataFrame)):
-            raise TypeError
+            raise TypeError("``data`` must be a Series or DataFrame")
         if data.ndim == 1:
             data = data.to_frame()
         if not data.index.is_unique or not data.columns.is_unique:

pandas/tests/formats/test_style.py

@@ -46,6 +46,17 @@ def h(x, foo='bar'):
                           'c': pd.Categorical(['a', 'b'])})
         ]
 
+    def test_init_non_pandas(self):
+        with tm.assertRaises(TypeError):
+            Styler([1, 2, 3])
+
+    def test_init_series(self):
+        result = Styler(pd.Series([1, 2]))
+        self.assertEqual(result.data.ndim, 2)
+
+    def test_repr_html_ok(self):
+        self.styler._repr_html_()
+
     def test_update_ctx(self):
         self.styler._update_ctx(self.attrs)
         expected = {(0, 0): ['color: red'],