Added unit test.

tests.py

@@ -0,0 +1,33 @@
+"""Installer unit tests."""
+
+import os
+import shutil
+import tempfile
+import unittest
+
+import run
+
+
+class ConfigFileTestCase(unittest.TestCase):
+    """Test configuration file generation."""
+
+    def setUp(self):
+        """Create temp dir."""
+        self.workdir = tempfile.mkdtemp()
+        self.cfgfile = os.path.join(self.workdir, "installer.cfg")
+
+    def tearDown(self):
+        """Delete temp dir."""
+        shutil.rmtree(self.workdir)
+
+    def test_configfile_generation(self):
+        """Check simple case."""
+        run.main([
+            "--stop-after-configfile-check",
+            "--configfile", self.cfgfile,
+            "example.test"])
+        self.assertTrue(os.path.exists(self.cfgfile))
+
+
+if __name__ == "__main__":
+    unittest.main()