Add some more tests

src/cfnlint/runner.py

@@ -230,7 +230,6 @@ def __init__(self, config: ConfigMixIn) -> None:
             self.config.templates
         except ValueError as e:
             self._cli_output([Match(str(e), ConfigError(), None)])
-            sys.exit(1)
         # load registry schemas before patching
         if self.config.registry_schemas:
             for path in self.config.registry_schemas:

test/unit/module/runner/test_runner.py

@@ -3,6 +3,7 @@
 SPDX-License-Identifier: MIT-0
 """
 
+from io import StringIO
 from unittest.mock import patch
 
 import pytest
@@ -93,3 +94,18 @@ def test_init_schemas(name, registry_path, patch_path, expected):
 
     PROVIDER_SCHEMA_MANAGER._registry_schemas = {}
     PROVIDER_SCHEMA_MANAGER.reset()
+
+
+def test_no_templates():
+    params = ["--template", "does-not-exist.yaml"]
+
+    config = ConfigMixIn(params)
+    with patch("sys.exit") as exit:
+        with patch("sys.stdout", new=StringIO()) as out:
+            exit.assert_not_called()
+            Runner(config)
+            assert out.getvalue().strip() == (
+                "E0003 does-not-exist.yaml could not "
+                "be processed by glob.glob\nNone:1:1"
+            )
+            exit.assert_called_once_with(2)