fixed #821 - test.assertRaises always PASS

@@ -688,20 +688,23 @@ Tester.prototype.assertRaises =
 Tester.prototype.assertRaise =
 Tester.prototype.assertThrows = function assertRaises(fn, args, message) {
     "use strict";
-    var context = {
+    var thrown = false,
+        error = undefined,
+        context = {
             type: "assertRaises",
             standard: "Function raises an error"
         };
     try {
         fn.apply(null, args);
-        this.assert(false, message, context);
-    } catch (error) {
-        this.assert(true, message, utils.mergeObjects(context, {
+    } catch (err) {
+        thrown = true;
+        error = err;
+    }
+    this.assert(thrown, message, utils.mergeObjects(context, {
         values: {
             error: error
         }
     }));
-    }
 };
 
 /**

@@ -48,12 +48,12 @@ casper.test.begin('Common assertions tests', 47, function(test) {
         test.assertRaises(function() {
             throw new Error('plop');
         }, [], 'Tester.assertRaises() works as expected');
-        test.assertRaise(function() {
-            throw new Error('plop');
-        }, [], 'Tester.assertRaise() works as expected [alias]');
-        test.assertThrows(function() {
-            throw new Error('plop');
-        }, [], 'Tester.assertThrows() works as expected [alias]');
+        try {
+            test.assertRaises(function() {}, []);
+            test.fail("Tester.assertRaises() doesn't pass when no error is thrown");
+        } catch (err) {
+            test.pass("Tester.assertRaises() doesn't pass when no error is thrown");
+        }
         test.assertResourceExists(/index\.html/, 'Tester.assertResourceExists() works as expected');
         test.assertResourceExist(/index\.html/, 'Tester.assertResourceExist() works as expected [alias]');
         test.assertTitle('CasperJS test index', 'Tester.assertTitle() works as expected');