increase test coverage

Author: shenxianpeng

tests/test_util.py

@@ -1,9 +1,24 @@
 import logging
 import pytest
 from itertools import product
-from unittest.mock import patch
+from unittest.mock import patch, mock_open, MagicMock
+from pathlib import Path
+import subprocess
+import sys
 
-from cpp_linter_hooks.util import ensure_installed, is_installed
+from cpp_linter_hooks.util import (
+    ensure_installed, 
+    is_installed, 
+    get_version_from_dependency,
+    _resolve_version,
+    _get_runtime_version,
+    _install_tool,
+    _resolve_install,
+    CLANG_FORMAT_VERSIONS,
+    CLANG_TIDY_VERSIONS,
+    DEFAULT_CLANG_FORMAT_VERSION,
+    DEFAULT_CLANG_TIDY_VERSION,
+)
 
 
 VERSIONS = [None, "20"]
@@ -79,3 +94,297 @@ def test_ensure_installed_tool_not_found(caplog):
             "not found and could not be installed" in record.message
             for record in caplog.records
         )
+
+
+# Tests for get_version_from_dependency
+@pytest.mark.benchmark
+def test_get_version_from_dependency_success():
+    """Test get_version_from_dependency with valid pyproject.toml."""
+    mock_toml_content = {
+        "project": {
+            "dependencies": [
+                "clang-format==20.1.7",
+                "clang-tidy==20.1.0",
+                "other-package==1.0.0"
+            ]
+        }
+    }
+    
+    with patch("pathlib.Path.exists", return_value=True), \
+         patch("toml.load", return_value=mock_toml_content):
+        
+        result = get_version_from_dependency("clang-format")
+        assert result == "20.1.7"
+        
+        result = get_version_from_dependency("clang-tidy")
+        assert result == "20.1.0"
+
+
+@pytest.mark.benchmark
+def test_get_version_from_dependency_missing_file():
+    """Test get_version_from_dependency when pyproject.toml doesn't exist."""
+    with patch("pathlib.Path.exists", return_value=False):
+        result = get_version_from_dependency("clang-format")
+        assert result is None
+
+
+@pytest.mark.benchmark
+def test_get_version_from_dependency_missing_dependency():
+    """Test get_version_from_dependency with missing dependency."""
+    mock_toml_content = {
+        "project": {
+            "dependencies": [
+                "other-package==1.0.0"
+            ]
+        }
+    }
+    
+    with patch("pathlib.Path.exists", return_value=True), \
+         patch("toml.load", return_value=mock_toml_content):
+        
+        result = get_version_from_dependency("clang-format")
+        assert result is None
+
+
+@pytest.mark.benchmark
+def test_get_version_from_dependency_malformed_toml():
+    """Test get_version_from_dependency with malformed toml."""
+    mock_toml_content = {}
+    
+    with patch("pathlib.Path.exists", return_value=True), \
+         patch("toml.load", return_value=mock_toml_content):
+        
+        result = get_version_from_dependency("clang-format")
+        assert result is None
+
+
+# Tests for _resolve_version
+@pytest.mark.benchmark
+@pytest.mark.parametrize("user_input,expected", [
+    (None, None),
+    ("20", "20.1.7"),  # Should find latest 20.x
+    ("20.1", "20.1.7"),  # Should find latest 20.1.x
+    ("20.1.7", "20.1.7"),  # Exact match
+    ("18", "18.1.8"),  # Should find latest 18.x
+    ("18.1", "18.1.8"),  # Should find latest 18.1.x
+    ("99", None),  # Non-existent major version
+    ("20.99", None),  # Non-existent minor version
+    ("invalid", None),  # Invalid version string
+])
+def test_resolve_version_clang_format(user_input, expected):
+    """Test _resolve_version with various inputs for clang-format."""
+    result = _resolve_version(CLANG_FORMAT_VERSIONS, user_input)
+    assert result == expected
+
+
+@pytest.mark.benchmark
+@pytest.mark.parametrize("user_input,expected", [
+    (None, None),
+    ("20", "20.1.0"),  # Should find latest 20.x
+    ("18", "18.1.8"),  # Should find latest 18.x
+    ("19", "19.1.0.1"),  # Should find latest 19.x
+    ("99", None),  # Non-existent major version
+])
+def test_resolve_version_clang_tidy(user_input, expected):
+    """Test _resolve_version with various inputs for clang-tidy."""
+    result = _resolve_version(CLANG_TIDY_VERSIONS, user_input)
+    assert result == expected
+
+
+# Tests for _get_runtime_version
+@pytest.mark.benchmark
+def test_get_runtime_version_clang_format():
+    """Test _get_runtime_version for clang-format."""
+    mock_output = "Ubuntu clang-format version 20.1.7-1ubuntu1\n"
+    
+    with patch("subprocess.check_output", return_value=mock_output):
+        result = _get_runtime_version("clang-format")
+        assert result == "20.1.7-1ubuntu1"
+
+
+@pytest.mark.benchmark
+def test_get_runtime_version_clang_tidy():
+    """Test _get_runtime_version for clang-tidy."""
+    mock_output = "LLVM (http://llvm.org/):\n  LLVM version 20.1.0\n"
+    
+    with patch("subprocess.check_output", return_value=mock_output):
+        result = _get_runtime_version("clang-tidy")
+        assert result == "20.1.0"
+
+
+@pytest.mark.benchmark
+def test_get_runtime_version_exception():
+    """Test _get_runtime_version when subprocess fails."""
+    with patch("subprocess.check_output", side_effect=subprocess.CalledProcessError(1, ["clang-format"])):
+        result = _get_runtime_version("clang-format")
+        assert result is None
+
+
+@pytest.mark.benchmark
+def test_get_runtime_version_clang_tidy_single_line():
+    """Test _get_runtime_version for clang-tidy with single line output."""
+    mock_output = "LLVM version 20.1.0\n"
+    
+    with patch("subprocess.check_output", return_value=mock_output):
+        result = _get_runtime_version("clang-tidy")
+        assert result is None  # Should return None for single line
+
+
+# Tests for _install_tool
+@pytest.mark.benchmark
+def test_install_tool_success():
+    """Test _install_tool successful installation."""
+    mock_path = "/usr/bin/clang-format"
+    
+    with patch("subprocess.check_call") as mock_check_call, \
+         patch("shutil.which", return_value=mock_path):
+        
+        result = _install_tool("clang-format", "20.1.7")
+        assert result == mock_path
+        
+        mock_check_call.assert_called_once_with([
+            sys.executable, "-m", "pip", "install", "clang-format==20.1.7"
+        ])
+
+
+@pytest.mark.benchmark
+def test_install_tool_failure():
+    """Test _install_tool when pip install fails."""
+    with patch("subprocess.check_call", side_effect=subprocess.CalledProcessError(1, ["pip"])), \
+         patch("cpp_linter_hooks.util.LOG") as mock_log:
+        
+        result = _install_tool("clang-format", "20.1.7")
+        assert result is None
+        
+        mock_log.error.assert_called_once_with("Failed to install %s==%s", "clang-format", "20.1.7")
+
+
+@pytest.mark.benchmark
+def test_install_tool_success_but_not_found():
+    """Test _install_tool when install succeeds but tool not found in PATH."""
+    with patch("subprocess.check_call"), \
+         patch("shutil.which", return_value=None):
+        
+        result = _install_tool("clang-format", "20.1.7")
+        assert result is None
+
+
+# Tests for _resolve_install
+@pytest.mark.benchmark
+def test_resolve_install_tool_already_installed_correct_version():
+    """Test _resolve_install when tool is already installed with correct version."""
+    mock_path = "/usr/bin/clang-format"
+    
+    with patch("shutil.which", return_value=mock_path), \
+         patch("cpp_linter_hooks.util._get_runtime_version", return_value="20.1.7"):
+        
+        result = _resolve_install("clang-format", "20.1.7")
+        assert result == Path(mock_path)
+
+
+@pytest.mark.benchmark
+def test_resolve_install_tool_version_mismatch():
+    """Test _resolve_install when tool has wrong version."""
+    mock_path = "/usr/bin/clang-format"
+    
+    with patch("shutil.which", return_value=mock_path), \
+         patch("cpp_linter_hooks.util._get_runtime_version", return_value="18.1.8"), \
+         patch("cpp_linter_hooks.util._install_tool", return_value=Path(mock_path)) as mock_install, \
+         patch("cpp_linter_hooks.util.LOG") as mock_log:
+        
+        result = _resolve_install("clang-format", "20.1.7")
+        assert result == Path(mock_path)
+        
+        mock_install.assert_called_once_with("clang-format", "20.1.7")
+        mock_log.info.assert_called_once_with(
+            "%s version mismatch (%s != %s), reinstalling...",
+            "clang-format", "18.1.8", "20.1.7"
+        )
+
+
+@pytest.mark.benchmark
+def test_resolve_install_tool_not_installed():
+    """Test _resolve_install when tool is not installed."""
+    with patch("shutil.which", return_value=None), \
+         patch("cpp_linter_hooks.util._install_tool", return_value=Path("/usr/bin/clang-format")) as mock_install:
+        
+        result = _resolve_install("clang-format", "20.1.7")
+        assert result == Path("/usr/bin/clang-format")
+        
+        mock_install.assert_called_once_with("clang-format", "20.1.7")
+
+
+@pytest.mark.benchmark
+def test_resolve_install_no_version_specified():
+    """Test _resolve_install when no version is specified."""
+    with patch("shutil.which", return_value=None), \
+         patch("cpp_linter_hooks.util._install_tool", return_value=Path("/usr/bin/clang-format")) as mock_install:
+        
+        result = _resolve_install("clang-format", None)
+        assert result == Path("/usr/bin/clang-format")
+        
+        mock_install.assert_called_once_with("clang-format", DEFAULT_CLANG_FORMAT_VERSION)
+
+
+@pytest.mark.benchmark
+def test_resolve_install_invalid_version():
+    """Test _resolve_install with invalid version."""
+    with patch("shutil.which", return_value=None), \
+         patch("cpp_linter_hooks.util._install_tool", return_value=Path("/usr/bin/clang-format")) as mock_install:
+        
+        result = _resolve_install("clang-format", "invalid.version")
+        assert result == Path("/usr/bin/clang-format")
+        
+        # Should fallback to default version
+        mock_install.assert_called_once_with("clang-format", DEFAULT_CLANG_FORMAT_VERSION)
+
+
+# Tests for ensure_installed edge cases
+@pytest.mark.benchmark
+def test_ensure_installed_version_mismatch(caplog):
+    """Test ensure_installed with version mismatch scenario."""
+    mock_path = "/usr/bin/clang-format"
+    
+    with patch("shutil.which", return_value=mock_path), \
+         patch("cpp_linter_hooks.util._get_runtime_version", return_value="18.1.8"), \
+         patch("cpp_linter_hooks.util._install_tool", return_value=Path(mock_path)):
+        
+        caplog.clear()
+        caplog.set_level(logging.INFO, logger="cpp_linter_hooks.util")
+        
+        result = ensure_installed("clang-format", "20.1.7")
+        assert result == "clang-format"
+        
+        # Should log version mismatch
+        assert any("version mismatch" in record.message for record in caplog.records)
+
+
+@pytest.mark.benchmark
+def test_ensure_installed_no_runtime_version():
+    """Test ensure_installed when runtime version cannot be determined."""
+    mock_path = "/usr/bin/clang-format"
+    
+    with patch("shutil.which", return_value=mock_path), \
+         patch("cpp_linter_hooks.util._get_runtime_version", return_value=None):
+        
+        result = ensure_installed("clang-format", "20.1.7")
+        assert result == "clang-format"
+
+
+# Tests for constants and defaults
+@pytest.mark.benchmark
+def test_default_versions():
+    """Test that default versions are set correctly."""
+    assert DEFAULT_CLANG_FORMAT_VERSION is not None
+    assert DEFAULT_CLANG_TIDY_VERSION is not None
+    assert isinstance(DEFAULT_CLANG_FORMAT_VERSION, str)
+    assert isinstance(DEFAULT_CLANG_TIDY_VERSION, str)
+
+
+@pytest.mark.benchmark
+def test_version_lists_not_empty():
+    """Test that version lists are not empty."""
+    assert len(CLANG_FORMAT_VERSIONS) > 0
+    assert len(CLANG_TIDY_VERSIONS) > 0
+    assert all(isinstance(v, str) for v in CLANG_FORMAT_VERSIONS)
+    assert all(isinstance(v, str) for v in CLANG_TIDY_VERSIONS)