test: add unit tests for core, parser and operations

tests/test_validator.py

@@ -0,0 +1,21 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+from sshctl.config.validator import validate_config
+
+
+def test_validate_nonexistent(tmp_path: Path) -> None:
+    result = validate_config(tmp_path / "nonexistent")
+    assert not result.passed
+    assert any("not found" in i.message for i in result.issues)
+
+
+def test_validate_valid(sample_config: Path) -> None:
+    result = validate_config(sample_config)
+    assert result.passed
+
+
+def test_validate_with_includes(config_with_includes: Path) -> None:
+    result = validate_config(config_with_includes)
+    assert result.passed