tests/frontend/help.py: Adding test case for --help of all commands

1 files changed, 43 insertions, 0 deletions

diff --git a/tests/frontend/help.py b/tests/frontend/help.py
new file mode 100644
index 000000000..a38125f77
--- /dev/null
+++ b/tests/frontend/help.py
@@ -0,0 +1,43 @@
+from click.testing import CliRunner
+import pytest
+
+# Import the main cli entrypoint
+from buildstream._frontend.main import cli
+
+
+def assert_help(cli_output):
+    expected_start = "Usage: "
+    if not cli_output.startswith(expected_start):
+        raise AssertionError("Help output expected to begin with '{}',"
+                             .format(expected_start) +
+                             " output was: {}"
+                             .format(cli_output))
+
+
+@pytest.fixture(scope="module")
+def runner():
+    return CliRunner()
+
+
+def test_help_main(runner):
+    result = runner.invoke(cli, ['--help'])
+    assert result.exit_code == 0
+    assert_help(result.output)
+
+
+@pytest.mark.parametrize("command", [
+    ('build'),
+    ('checkout'),
+    ('fetch'),
+    ('pull'),
+    ('push'),
+    ('shell'),
+    ('show'),
+    ('source-bundle'),
+    ('track'),
+    ('workspace')
+])
+def test_help(runner, command):
+    result = runner.invoke(cli, [command, '--help'])
+    assert result.exit_code == 0
+    assert_help(result.output)