feat: enhance test suite for ATT&CK to Excel export functionality

- Added slow marker to several tests in `test_cli.py` and `test_layers.py` to categorize them for longer execution times.
- Refactored `test_export_excel` in `test_cli.py` to utilize a mock `ToExcel` class for testing Excel export argument wiring.
- Improved `test_export_with_memstore_uses_current_dataframe_builder` and `test_export_with_pre_v18_version_uses_legacy_dataframe_builder` in `test_to_excel.py` to validate dataframe building logic based on version.
- Introduced new tests in `test_to_excel.py` to verify the creation of expected workbooks, handling of empty data, deduplication of citations, and sanitization of matrix sheet names.
- Updated `uv.lock` to require pytest version 9.0 or higher for development dependencies.

Author: jondricek

docs/CONTRIBUTING.md

@@ -51,11 +51,14 @@ Run `just` with no arguments to see all available commands. Here are the most co
 
 ```bash
 just lint          # Run pre-commit hooks (ruff format) on all files
-just test          # Run tests
+just test          # Run the full test suite, matching CI expectations
+just test-fast     # Run the fast local subset, excluding integration and slow tests
 just test-cov      # Run tests with coverage report
 just build         # Build the package
 ```
 
+Use `just test-fast` while iterating locally on changes that do not need full STIX-backed export or other slow integration coverage. Tests or setup steps that normally take longer than 10 seconds should be marked `slow`, so they are skipped by `just test-fast`. Before opening a PR, run `just test`; GitHub Actions also runs the full suite with coverage.
+
 To run STIX-backed tests against specific local bundles, pass the bundle paths to pytest:
 
 ```bash

justfile

@@ -35,6 +35,10 @@ ruff-format:
 test:
     uv run pytest
 
+# Run the fast local test subset, excluding integration and slow tests
+test-fast:
+    uv run pytest -m "not integration and not slow"
+
 # Run tests with coverage
 test-cov:
     uv run pytest --cov=mitreattack

mitreattack/diffStix/changelog_helper.py

@@ -10,7 +10,7 @@
 import textwrap
 from dataclasses import dataclass
 from pathlib import Path
-from typing import Dict, List, Optional
+from typing import Any, Dict, List, Optional
 
 import markdown
 import requests
@@ -1429,7 +1429,7 @@ def get_changes_dict(self):
         """Return dict format summarizing detected differences."""
         logger.info("Generating changes info")
 
-        changes_dict = {}
+        changes_dict: Dict[str, Any] = {}
         for domain in self.domains:
             changes_dict[domain] = {}
 

pyproject.toml

@@ -55,7 +55,7 @@ dev = [
     "check-wheel-contents>=0.6.1",
     "commitizen>=4.9.1",
     "pre-commit>=4.0.0",
-    "pytest>=8.4.2",
+    "pytest>=9.0",
     "pytest-cov>=7.0.0",
     "pytest-dotenv>=0.5.2",
     "python-semantic-release>=10.5.0",
@@ -80,8 +80,13 @@ package = true
 module-name = "mitreattack"
 module-root = ""
 
-[tool.pytest.ini_options]
+[tool.pytest]
+minversion = "9.0"
 testpaths = ["tests"]
+markers = [
+    "integration: tests that exercise real external-size data or full integration paths",
+    "slow: tests that are intentionally excluded from default fast runs",
+]
 
 [tool.ruff]
 line-length = 120