parameterize command line entry points and add tests of --version, a rudimentary check that the commands at least run

tests/test_cli.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+'''
+test_cli.py - test brozzler commands
+
+Copyright (C) 2017 Internet Archive
+
+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.
+'''
+
+import brozzler.cli
+import pkg_resources
+import pytest
+import subprocess
+
+def cli_commands():
+    commands = set(pkg_resources.get_entry_map(
+        'brozzler')['console_scripts'].keys())
+    commands.remove('brozzler-wayback')
+    try:
+        import gunicorn
+    except ImportError:
+        commands.remove('brozzler-dashboard')
+    try:
+        import pywb
+    except ImportError:
+        commands.remove('brozzler-easy')
+    return commands
+
+
+@pytest.mark.parametrize('cmd', cli_commands())
+def test_call_entrypoint(capsys, cmd):
+    entrypoint = pkg_resources.get_entry_map(
+            'brozzler')['console_scripts'][cmd]
+    callable = entrypoint.resolve()
+    with pytest.raises(SystemExit):
+        callable(['/whatever/bin/%s' % cmd, '--version'])
+    out, err = capsys.readouterr()
+    assert out == 'brozzler %s - %s\n' % (brozzler.__version__, cmd)
+    assert err == ''
+
+@pytest.mark.parametrize('cmd', cli_commands())
+def test_run_command(capsys, cmd):
+    proc = subprocess.Popen(
+        [cmd, '--version'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    out, err = proc.communicate()
+    assert out == ('brozzler %s - %s\n' % (
+        brozzler.__version__, cmd)).encode('ascii')
+    assert err == b''
+