@Test
public void createTextXmlContentTypeShouldReturnSameInstanceWhenDefaultBuiltInInstanceAlreadyExists() {

	// Given
	String textXmlContentTypeString = "text/xml";
	// When
	ContentType textXmlContentType = ContentType.createContentType(textXmlContentTypeString);
	ContentType otherTextXmlContentType = ContentType.createContentType(textXmlContentTypeString);
	// Then
	assertTrue(textXmlContentType == otherTextXmlContentType);
}