Reading test data from JSON in Selenium Python - Framework Patterns

Framework Mode - Reading test data from JSON

Folder Structure

selenium-python-project/
├── tests/
│   ├── test_login.py
│   └── test_checkout.py
├── pages/
│   ├── login_page.py
│   └── checkout_page.py
├── data/
│   └── test_data.json
├── utils/
│   └── json_reader.py
├── config/
│   └── config.yaml
├── drivers/
│   └── chromedriver.exe
└── requirements.txt

This structure keeps test data in the data/ folder as JSON files. Utility code to read JSON is in utils/json_reader.py. Tests use this data to run with different inputs.

Test Framework Layers

• Driver Layer: Manages browser drivers (e.g., ChromeDriver) to control browsers.
• Page Objects: Classes representing web pages with methods to interact with page elements.
• Tests: Test scripts that use page objects and test data to perform checks.
• Utilities: Helper functions like JSON readers to load test data from files.
• Configuration: Settings for environments, browsers, and credentials stored in config files.

Configuration Patterns

• Environment Config: Use config/config.yaml to store URLs, browser types, and credentials.
• Test Data: Store test inputs in JSON files inside data/ folder.
• Loading Data: Use a utility function in utils/json_reader.py to read JSON and return Python dictionaries.
• Parameterization: Tests read data from JSON and run multiple times with different inputs.

Test Reporting and CI/CD Integration

• Use pytest with plugins like pytest-html to generate readable HTML reports.
• Integrate tests in CI/CD pipelines (e.g., GitHub Actions, Jenkins) to run tests automatically on code changes.
• Reports include which test data inputs passed or failed, helping track data-driven test results.

Best Practices

• Separate Test Data: Keep test data outside test code for easy updates without code changes.
• Reusable JSON Reader: Create a single utility function to read JSON files to avoid duplication.
• Clear Naming: Name JSON keys clearly to match test input fields for easy mapping.
• Parameterize Tests: Use test frameworks' parameterization features to run tests with multiple data sets.
• Keep Data Small: Keep JSON test data focused and small for fast test runs and easy maintenance.

Self Check

Where in this folder structure would you add a new JSON file for test data related to user registration?

Key Result

Store test data as JSON files in a dedicated data folder and load them via utility functions for data-driven Selenium tests in Python.