getRequestHeaders example

    public function testCollect()
    {
        $c = new RequestDataCollector();

        $c->collect($request = $this->createRequest(), $this->createResponse());
        $c->lateCollect();

        $attributes = $c->getRequestAttributes();

        $this->assertSame('request', $c->getName());
        $this->assertInstanceOf(ParameterBag::class, $c->getRequestHeaders());
        $this->assertInstanceOf(ParameterBag::class, $c->getRequestServer());
        $this->assertInstanceOf(ParameterBag::class, $c->getRequestCookies());
        $this->assertInstanceOf(ParameterBag::class, $attributes);
        $this->assertInstanceOf(ParameterBag::class, $c->getRequestRequest());
        $this->assertInstanceOf(ParameterBag::class, $c->getRequestQuery());
        $this->assertInstanceOf(ParameterBag::class, $c->getResponseCookies());
        $this->assertSame('html', $c->getFormat());
        $this->assertEquals('foobar', $c->getRoute());
        $this->assertEquals(['name' => 'foo'], $c->getRouteParams());
        $this->assertSame([], $c->getSessionAttributes());
        $this->assertSame('en', $c->getLocale());