test(07-01): add auth test fixtures

- Create tests/test_auth/conftest.py with pytest fixtures
- mock_browser: Mock PlaywrightBrowser for unit testing
- mock_canvas: Mock canvas element for QR code screenshot
- sample_cookies: Test cookie data with z_c0 login cookie
- sample_cookies_no_login: Test cookies without login state
- mock_env_file: Temporary .kb_env file fixture
- intermediate_path: Temporary intermediate directory fixture

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/test_auth/conftest.py

@@ -0,0 +1,111 @@
+"""Pytest fixtures for auth module tests
+
+Provides mock objects and test fixtures for ZhihuLogin testing.
+"""
+
+import os
+from pathlib import Path
+from unittest.mock import AsyncMock, MagicMock, patch
+import pytest
+
+
+@pytest.fixture
+def mock_page():
+    """Mock Playwright Page object."""
+    page = MagicMock()
+    page.goto = MagicMock()
+    page.wait_for_selector = MagicMock()
+    page.query_selector = MagicMock()
+    page.set_default_timeout = MagicMock()
+    return page
+
+
+@pytest.fixture
+def mock_context():
+    """Mock Playwright BrowserContext object."""
+    context = MagicMock()
+    context.cookies = MagicMock(return_value=[])
+    context.add_cookies = MagicMock()
+    context.new_page = MagicMock()
+    context.close = MagicMock()
+    return context
+
+
+@pytest.fixture
+def mock_canvas():
+    """Mock Canvas element for QR code."""
+    canvas = MagicMock()
+    canvas.screenshot = MagicMock(return_value=b"fake_png_bytes")
+    return canvas
+
+
+@pytest.fixture
+def mock_browser(mock_page, mock_context, mock_canvas):
+    """Mock PlaywrightBrowser instance.
+
+    Provides a fully mocked browser that can be used for unit testing
+    without requiring actual browser interaction.
+    """
+    browser = MagicMock()
+
+    # Setup browser properties
+    browser.headless = True
+    browser.timeout = 30000
+    browser.page = mock_page
+    browser.context = mock_context
+
+    # Setup methods
+    browser.start = MagicMock()
+    browser.close = MagicMock()
+    browser.goto = MagicMock()
+    browser.wait_for_selector = MagicMock(return_value=mock_canvas)
+    browser.query_selector = MagicMock(return_value=mock_canvas)
+
+    # Setup context.cookies to return cookie list
+    browser.context.cookies = MagicMock(return_value=[])
+
+    return browser
+
+
+@pytest.fixture
+def sample_cookies():
+    """Sample cookie data for testing.
+
+    Returns a list of cookies including z_c0 for login detection.
+    """
+    return [
+        {"name": "z_c0", "value": "test_z_c0_value", "domain": ".zhihu.com"},
+        {"name": "_xsrf", "value": "test_xsrf_value", "domain": ".zhihu.com"},
+        {"name": "d_c0", "value": "test_d_c0_value", "domain": ".zhihu.com"},
+    ]
+
+
+@pytest.fixture
+def sample_cookies_no_login():
+    """Sample cookies without login cookie (z_c0)."""
+    return [
+        {"name": "_xsrf", "value": "test_xsrf_value", "domain": ".zhihu.com"},
+        {"name": "d_c0", "value": "test_d_c0_value", "domain": ".zhihu.com"},
+    ]
+
+
+@pytest.fixture
+def mock_env_file(tmp_path):
+    """Create a temporary .kb_env file for testing.
+
+    Returns the path to the temporary env file.
+    """
+    env_file = tmp_path / ".kb_env"
+    env_file.write_text("")
+    return env_file
+
+
+@pytest.fixture
+def intermediate_path(tmp_path):
+    """Create a temporary intermediate directory for testing.
+
+    Returns the path to the intermediate directory.
+    """
+    intermediate = tmp_path / "intermediate"
+    intermediate.mkdir(parents=True, exist_ok=True)
+    return str(intermediate)