V School Code Challenges

About

• A playground Node.js environment for testing and debugging pure functions.
• Useful for running local debugger and creating custom test cases for code puzzles from Edabit, Code Wars, etc.

Getting Started

• npm install
• npm run test (See Testing Single Challenges for further configuration)
• In VS Code, you can run the debugger using the Jest configuration called Unit Test listed in .vscode/launch.json file. Hotkey is F5. This will automatically read the jest.config.js file
• If you get stuck, solutions can be found by running git checkout solutions

Testing Single Challenges

• To run tests for all cases defined for a given challenge, set the property globals.testSingleChallenge within jest.config.js to the name of the file you wish to test as defined in /challenges (omit the .js extension). For example:

// jest.config.js
module.exports = {
    globals: {
        testSingleChallenge: "add_func"
    },
    //...
}

• If no value for globals.testSingleChallenge is provided, all tests will run for all challenges by default.

Testing Single Test Cases

• To run a test on a single test case for a given challenge, set the property globals.testSingleTestCase within jest.config.js to the index of the test case you wish to try. The property globals.testSingleChallenge must also be defined. For example:

// jest.config.js
module.exports = {
    globals: {
        testSingleChallenge: "add_func",
        testSingleTestCase: 0
    },
    // ...
}

Creating Custom Challenges

• Within /challenges directory, create a file which contains a default export of the function you wish to test. For example:

// challenges/add_func.js
module.exports = (x, y) => { return x + y };

• In test-cases.js add a property (using same name as the file created above) to the default export object which defines an array containing the set of inputs and expected values. Each test case should look something like this:

// test-cases.js
module.exports = {
    add_func: [
        [
            // arguments to be passed the 'add_func' function:
            [1, 2], 
            // expected output of the 'add_func' function:
            3
        ],
        [[0, 0], 0],
        [[-1, -2], -3],
    ],
    // etc...
}

Custom Tests

• The default workflow in main.test.js may not work for some scenarios, so custom tests can be added to custom.test.js.
• By default custom tests are switched off. To enable them, set the property globals.skipCustomTests within jest.config.js to false.
• To run only custom tests, set the property globals.runCustomTestsOnly within jest.config.js to true. This will override the other settings.

Author

• Reach out to Ben Turner for any questions, bugs, or contribution requests.