TST: Split and parameterize series/test_api.py (#45079)

Author: mroeschke

pandas/tests/series/test_api.py

@@ -25,19 +25,22 @@ def test_tab_completion(self):
         assert "dt" not in dir(s)
         assert "cat" not in dir(s)
 
+    def test_tab_completion_dt(self):
         # similarly for .dt
         s = Series(date_range("1/1/2015", periods=5))
         assert "dt" in dir(s)
         assert "str" not in dir(s)
         assert "cat" not in dir(s)
 
+    def test_tab_completion_cat(self):
         # Similarly for .cat, but with the twist that str and dt should be
         # there if the categories are of that type first cat and str.
         s = Series(list("abbcd"), dtype="category")
         assert "cat" in dir(s)
         assert "str" in dir(s)  # as it is a string categorical
         assert "dt" not in dir(s)
 
+    def test_tab_completion_cat_str(self):
         # similar to cat and str
         s = Series(date_range("1/1/2015", periods=5)).astype("category")
         assert "cat" in dir(s)
@@ -60,12 +63,8 @@ def test_tab_completion_with_categorical(self):
             "as_unordered",
         ]
 
-        def get_dir(s):
-            results = [r for r in s.cat.__dir__() if not r.startswith("_")]
-            return sorted(set(results))
-
         s = Series(list("aabbcde")).astype("category")
-        results = get_dir(s)
+        results = sorted({r for r in s.cat.__dir__() if not r.startswith("_")})
         tm.assert_almost_equal(results, sorted(set(ok_for_cat)))
 
     @pytest.mark.parametrize(
@@ -98,14 +97,11 @@ def test_index_tab_completion(self, index):
             else:
                 assert x not in dir_s
 
-    def test_not_hashable(self):
-        s_empty = Series(dtype=object)
-        s = Series([1])
+    @pytest.mark.parametrize("ser", [Series(dtype=object), Series([1])])
+    def test_not_hashable(self, ser):
         msg = "unhashable type: 'Series'"
         with pytest.raises(TypeError, match=msg):
-            hash(s_empty)
-        with pytest.raises(TypeError, match=msg):
-            hash(s)
+            hash(ser)
 
     def test_contains(self, datetime_series):
         tm.assert_contains_all(datetime_series.index, datetime_series)
@@ -138,12 +134,14 @@ def f(x):
         expected = tsdf.max()
         tm.assert_series_equal(result, expected)
 
+    def test_ndarray_compat_like_func(self):
         # using an ndarray like function
         s = Series(np.random.randn(10))
         result = Series(np.ones_like(s))
         expected = Series(1, index=range(10), dtype="float64")
         tm.assert_series_equal(result, expected)
 
+    def test_ndarray_compat_ravel(self):
         # ravel
         s = Series(np.random.randn(10))
         tm.assert_almost_equal(s.ravel(order="F"), s.values.ravel(order="F"))
@@ -152,15 +150,15 @@ def test_empty_method(self):
         s_empty = Series(dtype=object)
         assert s_empty.empty
 
-        s2 = Series(index=[1], dtype=object)
-        for full_series in [Series([1]), s2]:
-            assert not full_series.empty
+    @pytest.mark.parametrize("dtype", ["int64", object])
+    def test_empty_method_full_series(self, dtype):
+        full_series = Series(index=[1], dtype=dtype)
+        assert not full_series.empty
 
-    def test_integer_series_size(self):
+    @pytest.mark.parametrize("dtype", [None, "Int64"])
+    def test_integer_series_size(self, dtype):
         # GH 25580
-        s = Series(range(9))
-        assert s.size == 9
-        s = Series(range(9), dtype="Int64")
+        s = Series(range(9), dtype=dtype)
         assert s.size == 9
 
     def test_attrs(self):
@@ -186,19 +184,22 @@ def test_unknown_attribute(self):
         with pytest.raises(AttributeError, match=msg):
             ser.foo
 
-    def test_datetime_series_no_datelike_attrs(self, datetime_series):
+    @pytest.mark.parametrize("op", ["year", "day", "second", "weekday"])
+    def test_datetime_series_no_datelike_attrs(self, op, datetime_series):
         # GH#7206
-        for op in ["year", "day", "second", "weekday"]:
-            msg = f"'Series' object has no attribute '{op}'"
-            with pytest.raises(AttributeError, match=msg):
-                getattr(datetime_series, op)
+        msg = f"'Series' object has no attribute '{op}'"
+        with pytest.raises(AttributeError, match=msg):
+            getattr(datetime_series, op)
 
     def test_series_datetimelike_attribute_access(self):
         # attribute access should still work!
         ser = Series({"year": 2000, "month": 1, "day": 10})
         assert ser.year == 2000
         assert ser.month == 1
         assert ser.day == 10
+
+    def test_series_datetimelike_attribute_access_invalid(self):
+        ser = Series({"year": 2000, "month": 1, "day": 10})
         msg = "'Series' object has no attribute 'weekday'"
         with pytest.raises(AttributeError, match=msg):
             ser.weekday

pandas/tests/series/test_missing.py

@@ -36,17 +36,19 @@ def test_isna_for_inf(self):
         tm.assert_series_equal(r, e)
         tm.assert_series_equal(dr, de)
 
-    def test_isnull_for_inf_deprecated(self):
+    @pytest.mark.parametrize(
+        "method, expected",
+        [
+            ["isna", Series([False, True, True, False])],
+            ["dropna", Series(["a", 1.0], index=[0, 3])],
+        ],
+    )
+    def test_isnull_for_inf_deprecated(self, method, expected):
         # gh-17115
         s = Series(["a", np.inf, np.nan, 1.0])
         with pd.option_context("mode.use_inf_as_null", True):
-            r = s.isna()
-            dr = s.dropna()
-
-        e = Series([False, True, True, False])
-        de = Series(["a", 1.0], index=[0, 3])
-        tm.assert_series_equal(r, e)
-        tm.assert_series_equal(dr, de)
+            result = getattr(s, method)()
+        tm.assert_series_equal(result, expected)
 
     def test_timedelta64_nan(self):