set up testing

.vscode/settings.json

@@ -6,5 +6,13 @@
       "source.organizeImports": "explicit"
     },
   },
-  "isort.args":["--profile", "black"],
+  "isort.args": [
+    "--profile",
+    "black"
+  ],
+  "python.testing.pytestArgs": [
+    "tests"
+  ],
+  "python.testing.unittestEnabled": false,
+  "python.testing.pytestEnabled": true,
 }

tests/test_smoke_test.py

@@ -0,0 +1,10 @@
+from click.testing import CliRunner
+
+from xexe.cli import smoke_test
+
+
+def test_smoke_test():
+    runner = CliRunner()
+    result = runner.invoke(smoke_test)
+    assert result.exit_code == 0
+    assert "Oink oink!" in result.output