Revert an accidentally removed test.

Author: Julian

jsonschema/tests/test_cli.py

@@ -881,6 +881,13 @@ def test_useless_error_format(self):
 
 
 class TestCLIIntegration(TestCase):
+    def test_license(self):
+        output = subprocess.check_output(
+            [sys.executable, "-m", "pip", "show", "jsonschema"],
+            stderr=subprocess.STDOUT,
+        )
+        self.assertIn(b"License: MIT", output)
+
     def test_version(self):
         version = subprocess.check_output(
             [sys.executable, "-m", "jsonschema", "--version"],