Add cli test infrastructure

gerbonara/cli.py

@@ -299,6 +299,7 @@ def transform(transform, units, output_format, inpath, outpath,
 
 
 @cli.command()
+@click.option('--version', is_flag=True, callback=print_version, expose_value=False, is_eager=True)
 @click.option('--command-line-units', type=Unit(), help='''Units for values given in --transform. Default:
               millimeter''')
 @click.option('--warnings', 'format_warnings', type=click.Choice(['default', 'ignore', 'once']), default='default',

gerbonara/tests/test_cli.py

@@ -0,0 +1,42 @@
+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+#
+# Copyright 2023 Jan Sebastian Götte <gerbonara@jaseg.de>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+from pathlib import Path
+
+import pytest
+from click.testing import CliRunner
+
+from .utils import *
+from ..cli import render, rewrite, transform, merge, bounding_box, layers, meta
+
+class TestRender:
+    def invoke(self, *args):
+        runner = CliRunner()
+        res = runner.invoke(render, list(map(str, args)))
+        print(res.output)
+        assert res.exit_code == 0
+        return res.output
+
+    def test_basic(self):
+        assert self.invoke('--version').startswith('Version ')
+
+    @pytest.mark.parametrize('reference', ['example_flash_obround.gbr'], indirect=True)
+    def test_warnings(self, reference):
+        with pytest.warns(UserWarning):
+            self.invoke(reference, '--warnings=once')
+