stages: add new unit test for kickstart stage

This commit adds a simple and lightweight unit test for the new
kickstart options. It's pretty simple but also cheap and runs
fast.

stages/test/test_kickstart.py

@@ -0,0 +1,56 @@
+#!/usr/bin/python3
+
+import os.path
+import tempfile
+from dataclasses import dataclass
+
+import pytest
+
+from osbuild.testutil.imports import import_module_from_path
+
+
+@dataclass
+class KsTestCase:
+    """KsTestCase is a single test case for the kickstart stage
+
+    options:  a dict with the options passed to the kickstart stage
+    expected: the expected string in the generated kickstart file
+    """
+    options: str
+    expected: str
+
+
+@pytest.fixture(name="ks_test_cases")
+def ks_test_cases_fixtures():
+    return [
+        KsTestCase(
+            options={"lang": "en_US.UTF-8"}, expected="lang en_US.UTF-8"),
+        KsTestCase(
+            options={"keyboard": "us"}, expected="keyboard us"),
+        KsTestCase(
+            options={"timezone": "UTC"}, expected="timezone UTC"),
+        KsTestCase(
+            options={
+                "lang": "en_US.UTF-8",
+                "keyboard": "us",
+                "timezone": "UTC",
+            },
+            expected="lang en_US.UTF-8\nkeyboard us\ntimezone UTC",
+        ),
+    ]
+
+
+def test_kickstart(ks_test_cases):
+    ks_stage_path = os.path.join(os.path.dirname(__file__), "../org.osbuild.kickstart")
+    ks_stage = import_module_from_path("ks_stage", ks_stage_path)
+
+    ks_path = "kickstart/kfs.cfg"
+    with tempfile.TemporaryDirectory("kickstart-test-") as tmpdir:
+        for tc in ks_test_cases:
+            options = {"path": ks_path}
+            options.update(tc.options)
+            ks_stage.main(tmpdir, options)
+
+            with open(os.path.join(tmpdir, ks_path), encoding="utf-8") as fp:
+                ks_content = fp.read()
+            assert ks_content == tc.expected + "\n"

tox.ini

@@ -19,7 +19,7 @@ deps =
     pyyaml
 
 setenv =
-    LINTABLES = osbuild/ assemblers/* devices/* inputs/* mounts/* runners/* sources/* stages/*
+    LINTABLES = osbuild/ assemblers/* devices/* inputs/* mounts/* runners/* sources/* stages/*.* stages/test/*.py
     TYPEABLES = osbuild
 
 passenv =