@Test
public void createApplicationXmlContentTypeShouldReturnSameInstanceWhenDefaultBuiltInInstanceAlreadyExists() {

	// Given
	String applicationXmlContentTypeString = "application/xml";
	// When
	ContentType applicationXmlContentType = ContentType.createContentType(applicationXmlContentTypeString);
	ContentType otherApplicationXmlContentType = ContentType.createContentType(applicationXmlContentTypeString);
	// Then
	assertTrue(applicationXmlContentType == otherApplicationXmlContentType);
}