Fix test and warning message

pandas/__init__.py

@@ -212,9 +212,9 @@ class Panel:
 
         elif name == "datetime":
             warnings.warn(
-                "The datetime class is removed from pandas. Accessing it from "
-                "the top-level namespace will also be removed in the next "
-                "version",
+                "The pandas.datetime module is deprecated "
+                "and will be removed from pandas in a future version. "
+                "Import datetime directly instead.",
                 FutureWarning,
                 stacklevel=2,
             )
@@ -236,6 +236,7 @@ class Panel:
 
         raise AttributeError("module 'pandas' has no attribute '{}'".format(name))
 
+
 else:
 
     class Panel:
@@ -257,8 +258,9 @@ def __init__(self):
 
         def __getattr__(self, item):
             self.warnings.warn(
-                "The pandas.datetime module is deprecated and will be removed from pandas in a future version. "
-                "Import numpy directly instead",
+                "The pandas.datetime module is deprecated "
+                "and will be removed from pandas in a future version. "
+                "Import datetime directly instead.",
                 FutureWarning,
                 stacklevel=2,
             )

pandas/tests/api/test_api.py

@@ -224,11 +224,16 @@ def test_api(self):
 
 def test_datetime():
     from datetime import datetime
-    import warnings
 
-    with warnings.catch_warnings():
-        warnings.simplefilter("ignore", FutureWarning)
-        assert datetime.date(2015, 7, 10) == pd.datetime.date(2015, 7, 10)
+    msg = (
+        "The pandas.datetime module is deprecated "
+        "and will be removed from pandas in a future version. "
+        "Import datetime directly instead."
+    )
+
+    with tm.assert_produces_warning(FutureWarning) as w:
+        assert datetime(2015, 1, 2, 0, 0) == pd.datetime(2015, 1, 2, 0, 0)
+        assert msg in str(w[-1].message)
 
 
 class TestApi(Base):