ddt

ddt

A Data Driven Test library for node.js

This module iterates a list of input test data and for each data creates a test case by transforming the data and validating the generated result with expected data in the output list.

API

Require the ddt module and call test method against a config object.

var ddt = require('ddt');
ddt.test(config);

save the file e.g. test.js and then execute the test with mocha

mocha test.js

config

• inputs: an array of test case inputs.
• outputs: an array of expected test results.
• transform(input): a function for trasforming an input test case data, this is the function to be tested. Parameter input is the input test case data.
• validate(expected, actual): a function for validating transformed data (from input) to expected value which is from outputs array.
• groupName: a string value representing the group name for all the test cases. If the value is not specified, then all the test cases will be not grouped.
• caseName: could be a string or a function. If it s string value, each test case will be nameed with it; if it is a function, the test case name will be generated from calling of it. The function accepts 3 parameters: index, inputs and outputs for helping generating name based on actual test case.

Example

Suppose have 6 test cases, each test case has an integer input number and the expected value is the double of the input number. So, the 6 input test cases are [1, 2, 3, 4, 5, 6] and the exptected outputs are [2, 4, 6, 8, 10, 12]

var ddt = require('ddt');
var config = {
    inputs: [1, 2, 3, 4, 5, 6],
    outputs: [2, 4, 6, 8, 10, 12],
    trasform: function(input) {
        return 2 * input;
    },
    validate: function(expected, actual) {
        return expected == actual;
    },
    groupName: 'Double of a number',
    caseName: function(index, inputs, outputs) {
        return 'Doubling of number ' + inputs[index] + ' should return ' + outputs[index];
    }
};

ddt.test(config);

Save the file as test.js then use mocha to run the tests

mocha test.js --reporter spec

The test result is:

 Double of a number
    ✓ Doubling of number 1 should return 2 
    ✓ Doubling of number 2 should return 4 
    ✓ Doubling of number 3 should return 6 
    ✓ Doubling of number 4 should return 8 
    ✓ Doubling of number 5 should return 10 
    ✓ Doubling of number 6 should return 12

Test

Make sure mocha is installed globally

npm install mocha -g

Run npm test to run unit test

License

MIT