public function testWriteAfter() { $mockTextFile = m::mock(TextFile::class); $mockTextFile->shouldReceive("writeAfter")->with(1, "hasan gilak")->once(); $mockTextFile->shouldReceive("extractAgainAllLinesIntoArray")->once(); $this->textChains->setFile($mockTextFile); $this->textChains->writeAfter(1, "hasan gilak"); }