var fs = require('fs');
var page;
var beforeLoadFn;

beforeEach(function() {
	page = require('webpage').create();
	
	page.onConsoleMessage = function(msg) { console.log(msg); };

	page.onError = function(msg, trace) {
		var msgStack = [msg];
		if (trace && trace.length) {
			msgStack.push('TRACE:');
			trace.forEach(function(t) {
				msgStack.push(' -> ' + t.file + ': ' + t.line + (t.function ? ' (in function "' + t.function +'")' : ''));
			});
		}
	    // we need try..catch here as mocha throws error that catched by phantom.onError
	    try {
	    	mocha.throwError(msgStack.join('\n'));
	    } catch(e) { }
	};

	page.onInitialized = function() {
		page.injectJs(node_modules + 'chai/chai.js');
		page.injectJs(node_modules + 'sinon/pkg/sinon.js');
		page.injectJs(node_modules + 'sinon-chrome/chrome.js');
		page.injectJs(node_modules + 'sinon-chrome/src/phantom-tweaks.js');
		page.injectJs(node_modules + 'require-stub/index.js');
	    // call additional function defined in tests
	    if (beforeLoadFn) {
	    	beforeLoadFn();
	    }
	};
});

afterEach(function() {
	page.close();
	beforeLoadFn = null;
});