QUnit Step assertion plugin

This plugin for QUnit adds a step assertion method to test
the proper sequence in which the code should execute.

Usage

``js
assert.step(expected, message);
`

Where:
- expected: The expected step number (assertion sequence index)
- message: Optional message, same as for other assertions




Examples

`js
QUnit.test("example test", function(assert) {
function x() {
assert.step(2, "function y should be called first");
}
function y() {
assert.step(1);
}
y();
x();
});
``

For more examples, refer to the unit tests.

Contributing

In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality. Lint and test your code using grunt.