Switch to ScriptTest for CLI integration testing

osmerge/cli.py

@@ -2,11 +2,14 @@
 
 import click
 
+from . import VERSION
+
 
 log = logging.getLogger(__name__)
 
 
 @click.group()
+@click.version_option(message=VERSION)
 def main():
     logging.basicConfig(level=logging.INFO)
     logging.getLogger('yorm').setLevel(logging.WARNING)

requirements/ci.txt

@@ -9,6 +9,7 @@ pytest-describe
 pytest-expecter
 pytest-cov
 pytest-random
+scripttest == 1.3
 
 # Coverage
 coverage

tests/test_cli.py

@@ -1,16 +1,35 @@
-# pylint: disable=unused-variable,expression-not-assigned
+# pylint: disable=unused-variable,expression-not-assigned,redefined-outer-name
 
+import sys
+
+import pytest
+import scripttest
 from expecter import expect
-from click.testing import CliRunner
 
-from osmerge.cli import main
+
+@pytest.fixture
+def env(tmpdir):
+    path = str(tmpdir.join("test"))
+    env = scripttest.TestFileEnvironment(path)
+    return env
+
+
+@pytest.fixture
+def cli(env):
+    prog = sys.executable, '-m', 'osmerge'
+    return lambda *args: env.run(*prog, *args, expect_error=True)
 
 
 def describe_cli():
 
-    def it_can_be_called_without_a_command():
-        runner = CliRunner()
+    def it_displays_help_information(cli):
+        cmd = cli('--help')
+
+        expect(cmd.returncode) == 0
+        expect(cmd.stdout).contains("Usage: ")
 
-        result = runner.invoke(main)
+    def it_displays_version_information(cli):
+        cmd = cli('--version')
 
-        expect(result.exit_code) == 0
+        expect(cmd.returncode) == 0
+        expect(cmd.stdout or cmd.stderr).contains("OSMerge v0.")