fixed test break.

tests/unit/framework/validators/ExistValidatorTest.php

@@ -32,7 +32,7 @@ class ExistValidatorTest extends DatabaseTestCase
 			$this->fail('Exception should have been thrown at this time');
 		} catch (Exception $e) {
 			$this->assertInstanceOf('yii\base\InvalidConfigException', $e);
-			$this->assertEquals('The "className" property must be set.', $e->getMessage());
+			$this->assertEquals('The "targetClass" property must be set.', $e->getMessage());
 		}
 		// combine to save the time creating a new db-fixture set (likely ~5 sec)
 		try {
@@ -41,7 +41,7 @@ class ExistValidatorTest extends DatabaseTestCase
 			$this->fail('Exception should have been thrown at this time');
 		} catch (Exception $e) {
 			$this->assertInstanceOf('yii\base\InvalidConfigException', $e);
-			$this->assertEquals('The "attributeName" property must be configured as a string.', $e->getMessage());
+			$this->assertEquals('The "targetAttribute" property must be configured as a string.', $e->getMessage());
 		}
 	}