public function testAddCustomHeader() { $mail = new \r8\Mail($this->getTestTransport()); $this->assertEquals(array(), $mail->getCustomHeaders()); $this->assertSame($mail, $mail->addCustomHeader('X-Test', 'Example Header')); $this->assertEquals(array('X-Test' => 'Example Header'), $mail->getCustomHeaders()); $this->assertSame($mail, $mail->addCustomHeader('X-Test', Null)); $this->assertEquals(array('X-Test' => ''), $mail->getCustomHeaders()); $this->assertSame($mail, $mail->addCustomHeader('In-Reply-To', 'abcxyz')); $this->assertEquals(array('X-Test' => '', 'In-Reply-To' => 'abcxyz'), $mail->getCustomHeaders()); }