Bluz\Response\Response::getHeader PHP Method

    public function getHeader($header)
    {
        if ($this->hasHeader($header)) {
            return join(', ', $this->headers[$header]);
        } else {
            return '';
        }
    }

 /**
  * @covers \Bluz\Response\Response::addHeader
  * @covers \Bluz\Response\Response::getHeader
  * @covers \Bluz\Response\Response::getHeaderAsArray
  */
 public function testAddHeader()
 {
     $this->response->addHeader('foo', 'bar');
     $this->response->addHeader('foo', 'baz');
     $this->assertTrue($this->response->hasHeader('foo'));
     $this->assertEquals('bar, baz', $this->response->getHeader('foo'));
     $this->assertEqualsArray(['bar', 'baz'], $this->response->getHeaderAsArray('foo'));
     $this->assertEqualsArray([], $this->response->getHeaderAsArray('baz'));
 }