:octocat: fix no.1 for #45

tests/Output/QRStringTest.php

@@ -12,6 +12,7 @@
 
 namespace chillerlan\QRCodeTest\Output;
 
+use chillerlan\QRCodeExamples\MyCustomOutput;
 use chillerlan\QRCode\{QRCode, QROptions};
 use chillerlan\QRCode\Output\{QROutputInterface, QRString};
 
@@ -57,4 +58,19 @@ class QRStringTest extends QROutputTestAbstract{
 		$this::assertStringContainsString('B', $data);
 	}
 
+	/**
+	 * covers the custom output functionality via an example
+	 */
+	public function testCustomOutput():void{
+		$this->options->version         = 5;
+		$this->options->eccLevel        = QRCode::ECC_L;
+		$this->options->outputType      = QRCode::OUTPUT_CUSTOM;
+		$this->options->outputInterface = MyCustomOutput::class;
+
+		$this::assertSame(
+			file_get_contents(__DIR__.'/samples/custom'),
+			(new QRCode($this->options))->render('test')
+		);
+	}
+
 }