bug symfony#10926 [DomCrawler] Fixed the initial state for options without value attribute (stof)

This PR was merged into the 2.3 branch.

Discussion
----------

[DomCrawler] Fixed the initial state for options without value attribute

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | n/a

Commits
-------

78cff96 [DomCrawler] Fixed the initial state for options without value attribute

Author: fabpot

src/Symfony/Component/DomCrawler/Field/ChoiceFormField.php

@@ -232,22 +232,22 @@ protected function initialize()
 
             $found = false;
             foreach ($this->xpath->query('descendant::option', $this->node) as $option) {
-                $this->options[] = $this->buildOptionValue($option);
+                $optionValue = $this->buildOptionValue($option);
+                $this->options[] = $optionValue;
 
                 if ($option->hasAttribute('selected')) {
                     $found = true;
                     if ($this->multiple) {
-                        $this->value[] = $option->getAttribute('value');
+                        $this->value[] = $optionValue['value'];
                     } else {
-                        $this->value = $option->getAttribute('value');
+                        $this->value = $optionValue['value'];
                     }
                 }
             }
 
             // if no option is selected and if it is a simple select box, take the first option as the value
-            $option = $this->xpath->query('descendant::option', $this->node)->item(0);
-            if (!$found && !$this->multiple && $option instanceof \DOMElement) {
-                $this->value = $option->getAttribute('value');
+            if (!$found && !$this->multiple && !empty($this->options)) {
+                $this->value = $this->options[0]['value'];
             }
         }
     }

src/Symfony/Component/DomCrawler/Tests/Field/ChoiceFormFieldTest.php

@@ -319,6 +319,11 @@ public function testOptionWithNoValue()
     {
         $node = $this->createSelectNodeWithEmptyOption(array('foo' => false, 'bar' => false));
         $field = new ChoiceFormField($node);
+        $this->assertEquals('foo', $field->getValue());
+
+        $node = $this->createSelectNodeWithEmptyOption(array('foo' => false, 'bar' => true));
+        $field = new ChoiceFormField($node);
+        $this->assertEquals('bar', $field->getValue());
         $field->select('foo');
         $this->assertEquals('foo', $field->getValue(), '->select() changes the selected option');
     }