PhlyTest\Http\MessageTraitTest::testGetHeadersKeepsHeaderCaseSensitivity PHP Метод

    public function testGetHeadersKeepsHeaderCaseSensitivity()
    {
        $message = $this->message->withHeader('X-Foo', ['Foo', 'Bar']);
        $this->assertNotSame($this->message, $message);
        $this->assertEquals(['X-Foo' => ['Foo', 'Bar']], $message->getHeaders());
    }