@Test
public void addHeaderMethodShouldReturnSameInstanceOfBuilder() {

	// Given
	String key = "testKey";
	String value = "testValue";
	
	String url = "test";
	HttpMethod method = HttpMethod.GET;
	VolleyerConfiguration configuration = DefaultVolleyerConfigurationFactory.create();
	TestPurposeRequestBuilder builder = new TestPurposeRequestBuilder(requestQueue, configuration, url, method);
	
	// When
	TestPurposeRequestBuilder newBuilder = builder.addHeader(key, value);
	// Then
	assertTrue(builder == newBuilder);
}