Add test and adjust PHP function arguments

Signed-off-by: Lukas Reschke <lukas@statuscode.ch>

lib/private/RichObjectStrings/Validator.php

@@ -97,7 +97,7 @@ class Validator implements IValidator {
 	 * @param array $definition
 	 * @return string[]
 	 */
-	protected function getRequiredParameters($type, $definition) {
+	protected function getRequiredParameters($type, array $definition) {
 		if (isset($this->requiredParameters[$type])) {
 			return $this->requiredParameters[$type];
 		}

tests/lib/RichObjectStrings/DefinitionsTest.php

@@ -36,6 +36,15 @@ class DefinitionsTest extends TestCase {
 		return $testsuite;
 	}
 
+	/**
+	 * @expectedException \OCP\RichObjectStrings\InvalidObjectExeption
+	 * @expectedExceptionMessage Object type is undefined
+	 */
+	public function testGetDefinitionNotExisting() {
+		$definitions = new Definitions();
+		$definitions->getDefinition('NotExistingType');
+	}
+
 	/**
 	 * @dataProvider dataGetDefinition
 	 * @param string $type