feat: add unit tests

test/README.md

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+# MoneyPrinterTurbo Test Directory
+
+This directory contains unit tests for the **MoneyPrinterTurbo** project.
+
+## Directory Structure
+
+- `services/`: Tests for components in the `app/services` directory  
+  - `test_video.py`: Tests for the video service  
+  - `test_task.py`: Tests for the task service  
+
+## Running Tests
+
+You can run the tests using Python’s built-in `unittest` framework:
+
+```bash
+# Run all tests
+python -m unittest discover -s test
+
+# Run a specific test file
+python -m unittest test/services/test_video.py
+
+# Run a specific test class
+python -m unittest test.services.test_video.TestVideoService
+
+# Run a specific test method
+python -m unittest test.services.test_video.TestVideoService.test_preprocess_video
+````
+
+## Adding New Tests
+
+To add tests for other components, follow these guidelines:
+
+1. Create test files prefixed with `test_` in the appropriate subdirectory
+2. Use `unittest.TestCase` as the base class for your test classes
+3. Name test methods with the `test_` prefix
+
+## Test Resources
+
+Place any resource files required for testing in the `test/resources` directory.