refs #252 - better error handling for form.fill()

@@ -40,6 +40,7 @@ This version is yet to be released.
 - fixed [#231](https://github.com/n1k0/casperjs/pull/231) - added `--pre` and `--post` options to the `casperjs test` command to load test files before and after the execution of testsuite
 - fixed [#232](https://github.com/n1k0/casperjs/issues/232) - symlink resolution in the ruby version of the `casperjs` executable
 - fixed [#236](https://github.com/n1k0/casperjs/issues/236) - fixed `Casper.exit` returned `this` after calling `phantom.exit()` which may caused PhantomJS to hang
+- fixed [#252](https://github.com/n1k0/casperjs/issues/252) - better form.fill() error handling
 - added [`ClientUtils.getDocumentHeight()`](http://casperjs.org/api.html#clientutils.getDocumentHeight)
 - added [`toString()`](http://casperjs.org/api.html#casper.toString) and [`status()`](http://casperjs.org/api.html#casper.status) methods to `Casper` prototype.
 

@@ -630,19 +630,19 @@ Casper.prototype.fill = function fill(selector, vals, submit) {
     } else if (fillResults.errors.length > 0) {
         (function _each(self){
             fillResults.errors.forEach(function _forEach(error) {
-                self.log("form error: " + error, "error");
+                throw new CasperError(error);
             });
         })(this);
         if (submit) {
-            this.log("Errors encountered while filling form; submission aborted", "warning");
+            this.warn("Errors encountered while filling form; submission aborted");
             submit = false;
         }
     }
     // File uploads
     if (fillResults.files && fillResults.files.length > 0) {
         if (utils.isObject(selector) && selector.type === 'xpath') {
-            this.echo('⚠  Filling file upload fields is currently not supported using', 'COMMENT');
-            this.echo('   XPath selectors; Please use a CSS selector instead.', 'COMMENT');
+            this.warn('Filling file upload fields is currently not supported using ' +
+                      'XPath selectors; Please use a CSS selector instead.');
         } else {
             (function _each(self) {
                 fillResults.files.forEach(function _forEach(file) {

@@ -226,9 +226,10 @@
                             name: name,
                             path: err.path
                         });
+                    } else if(err.name === "FieldNotFound") {
+                        out.errors.push('Form field named "' + name + '" was not found.');
                     } else {
-                        this.log(err, "error");
-                        throw err;
+                        out.errors.push(err.toString());
                     }
                 }
             }
@@ -541,8 +542,10 @@
                 fields = field;
                 field = fields[0];
             }
-            if (!field instanceof HTMLElement) {
-                this.log("Invalid field type; only HTMLElement and NodeList are supported", "error");
+            if (!(field instanceof HTMLElement)) {
+                var error = new Error('Invalid field type; only HTMLElement and NodeList are supported');
+                error.name = 'FieldNotFound';
+                throw error;
             }
             if (this.options && this.options.safeLogs && field.getAttribute('type') === "password") {
                 // obfuscate password value

@@ -52,6 +52,13 @@ casper.then(function() {
     this.test.assertUrlMatch(/topic=bar/, 'Casper.fill() select field was submitted');
 });
 
+casper.thenOpen('tests/site/form.html', function() {
+    this.test.comment('Unexistent fields');
+    this.test.assertRaises(this.fill, ['form[action="result.html"]', {
+        unexistent: 42
+    }, true], 'Casper.fill() raises an exception when unable to fill a form');
+});
+
 // multiple forms
 casper.thenOpen('tests/site/multiple-forms.html', function() {
     this.test.comment('Multiple forms');