Another test attempt for #5356

tests/unit/framework/helpers/HtmlTest.php

@@ -278,12 +278,6 @@ EOD;
     public function testListBox()
     {
         $expected = <<<EOD
-<select name="test[]" multiple size="4">
-
-</select>
-EOD;
-        $this->assertEqualsWithoutLE($expected, Html::listBox('test', null, [], ['multiple' => true]));
-        $expected = <<<EOD
 <select name="test" size="4">
 
 </select>

tests/unit/framework/widgets/ActiveFormTest.php

@@ -50,4 +50,21 @@ EOF
             , (string) $form->field($model, 'name', $o)->input('email', ['required' => 'test']));
 
     }
+
+    public function testIssue5356()
+    {
+        $model = new DynamicModel(['categories']);
+        $model->categories = 1;
+        ob_start();
+        $form = new ActiveForm(['action' => '/something']);
+        ob_end_clean();
+
+        // https://github.com/yiisoft/yii2/issues/5356
+        $this->assertEquals(<<<EOF
+<div class="form-group field-dynamicmodel-name">
+<input type="email" id="dynamicmodel-name" class="form-control" name="DynamicModel[name]" required>
+</div>
+EOF
+             , (string) $form->field($model, 'categories')->listBox(['apple', 'banana', 'avocado'], ['multiple' => true]));
+    }
 }