Start fleshing out commands.

bindep/main.py

@@ -1,3 +1,5 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
 # Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -13,5 +15,18 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import logging
+import sys
+
+
 def main():
-    pass
+    try:
+        open('other-requirements.txt', 'rt')
+    except IOError:
+        logging.error('No other-requirements.txt file found.')
+        return 1
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main())

bindep/tests/test_main.py

@@ -0,0 +1,60 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
+#
+# 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 os
+
+from fixtures import FakeLogger
+from fixtures import Fixture
+from fixtures import MonkeyPatch
+from fixtures import TempDir
+from testtools import TestCase
+
+from bindep.main import main
+
+
+class MainFixture(Fixture):
+    """Encapsulate running main().
+
+    :attr logger: The logger fixture from the process invocation.
+    :attr path: The path to the root of the isolated temp dir.
+    """
+
+    def setUp(self):
+        super(MainFixture, self).setUp()
+        self.logger = self.useFixture(FakeLogger())
+        self.path = self.useFixture(TempDir()).path
+        self.addCleanup(os.chdir, self.path)
+        os.chdir(self.path)
+
+
+class TestMain(TestCase):
+
+    def test_missing_requirements_file(self):
+        fixture = self.useFixture(MainFixture())
+        self.useFixture(MonkeyPatch('sys.argv', ['bindep']))
+        self.assertEqual(1, main())
+        self.assertEqual(
+            'No other-requirements.txt file found.\n', fixture.logger.output)
+
+    def test_empty_requirements_file(self):
+        fixture = self.useFixture(MainFixture())
+        self.useFixture(MonkeyPatch('sys.argv', ['bindep']))
+        with open(fixture.path + '/other-requirements.txt', 'wt'):
+            pass
+        self.assertEqual(0, main())
+        self.assertEqual('', fixture.logger.output)
+

tox.ini

@@ -32,3 +32,5 @@ commands = {posargs}
 [flake8]
 exclude = .venv,.tox,dist,doc,*.egg,build
 show-source = true
+ignore = H302,W391
+