Add tests

tests/console/commands/test_about.py

+from cleo.testers import CommandTester
+
+
+def test_about(app):
+    command = app.find('about')
+    tester = CommandTester(command)
+
+    tester.execute([('command', command.get_name())])
+
+    expected = """\
+Poetry - Package Management for Python
+
+Poetry is a dependency manager tracking local dependencies of your projects and libraries.
+See https://github.com/sdispater/poetry for more information.
+
+"""
+
+    assert tester.get_display() == expected

tests/console/commands/test_check.py

+from cleo.testers import CommandTester
+
+
+def test_about(app):
+    command = app.find('check')
+    tester = CommandTester(command)
+
+    tester.execute([('command', command.get_name())])
+
+    expected = """\
+All set!
+"""
+
+    assert tester.get_display() == expected

tests/console/conftest.py

+import pytest
+
+from poetry.console import Application as BaseApplication
+from poetry.utils._compat import Path
+
+
+class Application(BaseApplication):
+
+    def __init__(self, poetry_path):
+        super(Application, self).__init__()
+
+        self._poetry_path = poetry_path
+
+    @property
+    def poetry(self):
+        from poetry.poetry import Poetry
+
+        if self._poetry is not None:
+            return self._poetry
+
+        self._poetry = Poetry.create(self._poetry_path)
+
+        return self._poetry
+
+
+@pytest.fixture
+def app():
+    return Application(
+        Path(__file__).parent.parent / 'fixtures' / 'sample_project'
+    )