chore: import upstream snapshot with attribution

python/tests/test_util.py

@@ -0,0 +1,89 @@
+# Copyright 2025-present the zvec project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+from __future__ import annotations
+
+from unittest.mock import MagicMock, patch
+
+import pytest
+from zvec import require_module
+
+
+# ----------------------------
+# require_module func Test Case
+# ----------------------------
+def test_require_module_success():
+    module = require_module("os")
+    assert module is not None
+    assert hasattr(module, "path")
+
+
+def test_require_module_with_submodule_success():
+    module = require_module("os.path")
+    assert module is not None
+    assert hasattr(module, "join")
+
+
+def test_require_module_import_error():
+    with pytest.raises(ImportError) as exc_info:
+        require_module("nonexistent_module")
+
+    exception_msg = str(exc_info.value)
+    assert "Required package 'nonexistent_module' is not installed." in exception_msg
+
+
+def test_require_module_with_mitigation_import_error():
+    with pytest.raises(ImportError) as exc_info:
+        require_module("nonexistent_module.submodule", mitigation="custom_package")
+
+    exception_msg = str(exc_info.value)
+    assert "Required package 'custom_package' is not installed." in exception_msg
+    assert (
+        "Module 'nonexistent_module.submodule' is part of 'nonexistent_module'"
+        in exception_msg
+    )
+    assert "please pip install 'custom_package'." in exception_msg
+
+
+def test_require_module_submodule_import_error():
+    with pytest.raises(ImportError) as exc_info:
+        require_module("os.nonexistent_submodule")
+
+    exception_msg = str(exc_info.value)
+    assert (
+        "Required package 'os.nonexistent_submodule' is not installed." in exception_msg
+    )
+    assert "Module 'os.nonexistent_submodule' is part of 'os'" in exception_msg
+    assert "please pip install 'os'." in exception_msg
+
+
+@patch("importlib.import_module")
+def test_require_module_wraps_original_exception(mock_import_module):
+    original_exception = ImportError("Original error")
+    mock_import_module.side_effect = original_exception
+
+    with pytest.raises(ImportError) as exc_info:
+        require_module("some_module")
+
+    assert exc_info.value.__cause__ is original_exception
+
+
+@patch("importlib.import_module")
+def test_require_module_calls_importlib(mock_import_module):
+    mock_module = MagicMock()
+    mock_import_module.return_value = mock_module
+
+    result = require_module("test_module")
+
+    mock_import_module.assert_called_once_with("test_module")
+    assert result is mock_module