6. Automatic testing

Unit test with mocka

Testing your IA is very important. In order to automatically test the modules, the IA project bundles the Mocha framework, a complete test suite.

Running the tests

One command line:

$ tests

It will run the mocha test suite.

Implementing the tests

If a module contains a test/ folder, it will automatically be tested by the mocha runner.

Examples

Testing for expected result using assert

describe('Calculator', function() {
it('Respond with matching records (3x2 = 6)', function(done) {
    let resultPromise = Calculator.getData(['3*2'], '', "en_gb", i18n);
    resultPromise.then((result) => {
        assert.equal(result, 6);
        done();
    }).catch((error) => {
        done(error);
    })
});

Testing for error handling

Note: the done function without parameter corresponds to a success and with a parameter is an error

it('Handling error', function(done) {
    let resultPromise = Calculator.getData(['3****2'], '', "en_gb", i18n);
    resultPromise.then((result) => {
        done('Error should be handled');
    }).catch((error) => {
        if (error === "Your formula isn't valid") {
            done();
        } else {
            done(error);
        }
    })
});

How to mock data

Proxyquire dynamically injects your mock inside the module to test. You can inject a mock into a module by requiring the module using proxyquire and passing along the mock to use.

Here's an example for an hypothetical geo_solver which uses an elasticsearch config:

const geoSolver = proxyquire('../geo_solver', {'elasticsearch':elasticMock});

Links related

• For a complete Mocha feature list, check mocha's website
  • https://mochajs.org
• For a complete documentation, check mocha's wiki
  • https://github.com/mochajs/mocha/wiki
• For a complete documentation, check proxyquire's github
  • https://github.com/thlorenz/proxyquire