better error handling

@@ -5,3 +5,4 @@ modules/querystring.js
 samples/**
 tests/**
 tmp
+./*.js

@@ -69,12 +69,16 @@ CasperError.prototype = Object.getPrototypeOf(new Error());
     }
 
     function __die(message) {
-        console.error(message);
+        if (message) {
+            console.error(message);
+        }
         phantom.exit(1);
     }
 
     function __terminate(message) {
-        console.log(message);
+        if (message) {
+            console.log(message);
+        }
         phantom.exit();
     }
 
@@ -90,13 +94,17 @@ CasperError.prototype = Object.getPrototypeOf(new Error());
         }
     })(phantom.version);
 
-    // Hooks in default phantomjs error handler to print a hint when a possible
-    // casperjs command misuse is detected.
+    // Hooks in default phantomjs error handler
     phantom.onError = function onPhantomError(msg, trace) {
         phantom.defaultErrorHandler.apply(phantom, arguments);
+        // print a hint when a possible casperjs command misuse is detected
         if (msg.indexOf("ReferenceError: Can't find variable: casper") === 0) {
             console.error('Hint: you may want to use the `casperjs test` command.');
         }
+        // exits on syntax error
+        if (msg.indexOf('SyntaxError: Parse error') === 0) {
+            __die();
+        }
     };
 
     // Patching fs

@@ -360,7 +360,6 @@ Casper.prototype.checkStep = function checkStep(self, onComplete) {
         }
     } catch (error) {
         self.emit('complete.error', error);
-        throw error;
     }
 };
 
@@ -1372,7 +1371,6 @@ Casper.prototype.runStep = function runStep(step) {
         }
     } catch (err) {
         this.emit('step.error', err);
-        throw err;
     }
     if (!skipLog) {
         this.emit('step.complete', stepResult);

@@ -259,7 +259,7 @@ Tester.prototype.assertTrue = function assert(subject, message, context) {
         }
     }, context || {});
     if (!result.success && result.doThrow) {
-        throw new AssertionError(message, result);
+        throw new AssertionError(message || result.standard, result);
     }
     return this.processAssertionResult(result);
 };

+qsfjdhf!èrè"èqwnfkmsghfkswjdgfjksn

@@ -81,6 +81,20 @@ class CasperExecTest(unittest.TestCase):
         self.assertCommandOutputEquals(script_path, 'it works')
 
     @timeout(20)
+    def test_syntax_error(self):
+        script_path = os.path.join(TEST_ROOT, 'error', 'syntax.js')
+        self.assertCommandOutputContains(script_path, [
+            'SyntaxError: Parse error',
+        ], failing=True)
+
+    @timeout(20)
+    def test_syntax_error_in_test(self):
+        script_path = os.path.join(TEST_ROOT, 'error', 'syntax.js')
+        self.assertCommandOutputContains('test %s' % script_path, [
+            'SyntaxError: Parse error',
+        ], failing=True)
+
+    @timeout(20)
     def test_simple_test_script(self):
         script_path = os.path.join(TEST_ROOT, 'tester', 'mytest.js')
         self.assertCommandOutputContains('test ' + script_path, [