/** * @covers nochso\Diff\Format\Upstream::format * @covers nochso\Diff\Format\Upstream::setHeader */ public function testCustomHeaderCanBeUsed() { $formatter = new Upstream(); $formatter->setHeader(['CUSTOM HEADER']); $diff = Diff::create('a', 'b'); $this->assertEquals("CUSTOM HEADER\n@@ @@\n-a\n+b\n", $formatter->format($diff)); }