Add test showing how error translation works in FormHelper.

Refs #5382

Author: markstory

tests/TestCase/View/Helper/FormHelperTest.php

@@ -1865,6 +1865,60 @@ public function testEmptyInputErrorValidation() {
 		$this->assertHtml($expected, $result);
 	}
 
+/**
+ * Test validation errors, when calling input() overriding validation messages
+ *
+ * @return void
+ */
+	public function testInputErrorMessage() {
+		$this->article['errors'] = [
+			'title' => ['error message']
+		];
+		$this->Form->create($this->article);
+
+		$result = $this->Form->input('title', [
+			'error' => 'Custom error!'
+		]);
+		$expected = [
+			'div' => ['class' => 'input text required error'],
+			'label' => ['for' => 'title'],
+			'Title',
+			'/label',
+			'input' => [
+				'type' => 'text', 'name' => 'title',
+				'id' => 'title', 'class' => 'form-error',
+				'required' => 'required',
+			],
+			['div' => ['class' => 'error-message']],
+			'Custom error!',
+			'/div',
+			'/div'
+		];
+		$this->assertHtml($expected, $result);
+
+		$result = $this->Form->input('title', [
+			'error' => ['error message' => 'Custom error!']
+		]);
+		$expected = [
+			'div' => ['class' => 'input text required error'],
+			'label' => ['for' => 'title'],
+			'Title',
+			'/label',
+			'input' => [
+				'type' => 'text',
+				'name' => 'title',
+				'id' => 'title',
+				'class' => 'form-error',
+				'required' => 'required'
+			],
+			['div' => ['class' => 'error-message']],
+			'Custom error!',
+			'/div',
+			'/div'
+		];
+		$this->assertHtml($expected, $result);
+	}
+
 /**
  * Tests displaying errors for nested entities
  *