Fixes some tests for Gecko

- skip tests about javascript: links, because they are executed asynchronously
  so tests about them fails.
- event.x and event.y don't exist in Gecko. The standard way is event.clientX
  and event.clientY

@@ -29,16 +29,16 @@
                     event.preventDefault();
                     event.preventDefault();
                 };
                 };
                 window.onmousedown = function(event) {
                 window.onmousedown = function(event) {
-                    results.testdown = [event.x, event.y];
+                    results.testdown = [event.clientX, event.clientY];
                 };
                 };
                 window.onmouseup = function(event) {
                 window.onmouseup = function(event) {
-                    results.testup = [event.x, event.y];
+                    results.testup = [event.clientX, event.clientY];
                 };
                 };
                 window.onmousemove = function(event) {
                 window.onmousemove = function(event) {
-                    results.testmove = [event.x, event.y];
+                    results.testmove = [event.clientX, event.clientY];
                 };
                 };
                 window.ondblclick = function(event) {
                 window.ondblclick = function(event) {
-                    results.testdoubleclick = [event.x, event.y];
+                    results.testdoubleclick = [event.clientX, event.clientY];
                 };
                 };
                 var test5elem = document.querySelector('#test5');
                 var test5elem = document.querySelector('#test5');
                 test5elem.addEventListener('mousedown', function(event) {
                 test5elem.addEventListener('mousedown', function(event) {

@@ -21,7 +21,12 @@ casper.test.begin('onclick variants tests', 8, function(test) {
         test.assert(this.click('#test3'), 'Casper.click() can click an `onclick=".*; return false"` link');
         test.assert(this.click('#test3'), 'Casper.click() can click an `onclick=".*; return false"` link');
         test.assert(this.click('#test4'), 'Casper.click() can click an unobstrusive js handled link');
         test.assert(this.click('#test4'), 'Casper.click() can click an unobstrusive js handled link');
         var results = this.getGlobal('results');
         var results = this.getGlobal('results');
-        test.assert(results.test1, 'Casper.click() has clicked an `href="javascript:` link');
+        if (phantom.casperEngine == 'slimerjs') {
+            // "javascript:" link in Gecko are executed asynchronously, so we don't have result at this time
+            test.skip(1)
+        }
+        else
+            test.assert(results.test1, 'Casper.click() has clicked an `href="javascript:` link');
         test.assert(results.test2, 'Casper.click() has clicked an `href="#"` link');
         test.assert(results.test2, 'Casper.click() has clicked an `href="#"` link');
         test.assert(results.test3, 'Casper.click() has clicked an `onclick=".*; return false"` link');
         test.assert(results.test3, 'Casper.click() has clicked an `onclick=".*; return false"` link');
         test.assert(results.test4, 'Casper.click() has clicked an unobstrusive js handled link');
         test.assert(results.test4, 'Casper.click() has clicked an unobstrusive js handled link');
@@ -41,8 +46,13 @@ casper.test.begin('clickLabel tests tests', 8, function(test) {
         test.assert(this.clickLabel('test4'),
         test.assert(this.clickLabel('test4'),
             'Casper.clickLabel() can click an unobstrusive js handled link');
             'Casper.clickLabel() can click an unobstrusive js handled link');
         var results = this.getGlobal('results');
         var results = this.getGlobal('results');
-        test.assert(results.test1,
-            'Casper.clickLabel() has clicked an `href="javascript:` link');
+        if (phantom.casperEngine == 'slimerjs') {
+            // "javascript:" link in Gecko are executed asynchronously, so we don't have result at this time
+            test.skip(1)
+        }
+        else
+            test.assert(results.test1,
+                'Casper.clickLabel() has clicked an `href="javascript:` link');
         test.assert(results.test2,
         test.assert(results.test2,
             'Casper.clickLabel() has clicked an `href="#"` link');
             'Casper.clickLabel() has clicked an `href="#"` link');
         test.assert(results.test3,
         test.assert(results.test3,