postcss-critical-split/testsuite/deprecation-warn-save-feature/process.js

A PostCSS plugin that takes existing CSS files and splits out the annotated critical styles into a seperate file.

var postcss = require('postcss'),
	fs = require('fs');

module.exports = function(criticalSplit, input, output, opts) {
	spyOn(console, 'warn').and.callFake(function(message){
		// do nothing
	});

	spyOn(fs, 'writeFileSync').and.callFake(function(path, data) {
		return true;
	});

	expect(console.warn).not.toHaveBeenCalled();

	return postcss([criticalSplit(opts)]).process(input)
		.then(function(result) {
			expect(console.warn).toHaveBeenCalled();
		});
}