1 files changed, 54 insertions, 0 deletions
diff --git a/www/wiki/tests/phpunit/includes/libs/DeferredStringifierTest.php b/www/wiki/tests/phpunit/includes/libs/DeferredStringifierTest.php
new file mode 100644
index 00000000..c9cdf583
--- /dev/null
+++ b/www/wiki/tests/phpunit/includes/libs/DeferredStringifierTest.php
@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * @covers DeferredStringifier
+ */
+class DeferredStringifierTest extends PHPUnit\Framework\TestCase {
+
+	use MediaWikiCoversValidator;
+
+	/**
+	 * @dataProvider provideToString
+	 */
+	public function testToString( $params, $expected ) {
+		$class = new ReflectionClass( DeferredStringifier::class );
+		$ds = $class->newInstanceArgs( $params );
+		$this->assertEquals( $expected, (string)$ds );
+	}
+
+	public static function provideToString() {
+		return [
+			// No args
+			[
+				[
+					function () {
+						return 'foo';
+					}
+				],
+				'foo'
+			],
+			// Has args
+			[
+				[
+					function ( $i ) {
+						return $i;
+					},
+					'bar'
+				],
+				'bar'
+			],
+		];
+	}
+
+	/**
+	 * Verify that the callback is not called if
+	 * it is never converted to a string
+	 */
+	public function testCallbackNotCalled() {
+		$ds = new DeferredStringifier( function () {
+			throw new Exception( 'This should not be reached!' );
+		} );
+		// No exception was thrown
+		$this->assertTrue( true );
+	}
+}