Re-add the second test for importing jsonschema.cli

(This doesn't functionally change anything, but does
resolve some warnings module frustration thanks to
@asottile and @gaborbernat.)

Author: Julian

jsonschema/tests/test_deprecations.py

@@ -1,4 +1,5 @@
 from unittest import TestCase
+import importlib
 import subprocess
 import sys
 
@@ -264,6 +265,22 @@ def test_draftN_format_checker(self):
         with self.assertRaises(ImportError):
             from jsonschema import draft1234_format_checker  # noqa
 
+    def test_import_cli(self):
+        """
+        As of v4.17.0, importing jsonschema.cli is deprecated.
+        """
+
+        with self.assertWarns(DeprecationWarning) as w:
+            import jsonschema.cli
+            importlib.reload(jsonschema.cli)
+
+        self.assertEqual(w.filename, importlib.__file__)
+        self.assertTrue(
+            str(w.warning).startswith(
+                "The jsonschema CLI is deprecated and will be removed ",
+            ),
+        )
+
     def test_cli(self):
         """
         As of v4.17.0, the jsonschema CLI is deprecated.