DEVX-83: fix: fail lint-dockerfiles when hadolint is missing

tests/unit/test_install_tools.py

@@ -222,6 +222,24 @@ class TestInstallTea:
         assert (tmp_path / "tea").exists()
 
 
+class TestInstallHadolint:
+    def test_already_installed(self) -> None:
+        with patch.object(install_tools, "_is_installed", return_value=True):
+            assert install_tools.install_hadolint() is True
+
+    def test_install(self, tmp_path: Path) -> None:
+        def _write_file(url: str, path: Path) -> tuple[str, None]:
+            Path(path).write_bytes(b"binary")
+            return str(path), None
+
+        with patch.object(install_tools, "_is_installed", return_value=False):
+            with patch.object(install_tools, "TARGET_DIR", tmp_path):
+                with patch.object(platform, "machine", return_value="x86_64"):
+                    with patch.object(install_tools, "_download", side_effect=_write_file):
+                        assert install_tools.install_hadolint() is True
+        assert (tmp_path / "hadolint").exists()
+
+
 class TestListTools:
     def test_list(self, tmp_path: Path) -> None:
         with patch.object(install_tools, "TARGET_DIR", tmp_path):
@@ -251,6 +269,11 @@ class TestInstallTool:
             assert install_tools._install_tool("tea") is True
         mock.assert_called_once()
 
+    def test_hadolint(self) -> None:
+        with patch.object(install_tools, "install_hadolint", return_value=True) as mock:
+            assert install_tools._install_tool("hadolint") is True
+        mock.assert_called_once()
+
     def test_unknown_tool(self) -> None:
         with pytest.raises(ClickException, match="Unknown tool"):
             install_tools._install_tool("unknown")
@@ -269,7 +292,7 @@ class TestMain:
         with patch.object(install_tools, "_install_tool", return_value=True) as mock_install:
             result = runner.invoke(install_tools.main, [])
         assert result.exit_code == 0
-        assert mock_install.call_count == 4
+        assert mock_install.call_count == 5
 
     def test_install_specific_tool(self) -> None:
         runner = CliRunner()