@Test
public void createTextJsonContentTypeShouldReturnSameInstanceWhenDefaultBuiltInInstanceAlreadyExists() {

	// Given
	String textJsonContentTypeString = "text/json";
	// When
	ContentType textJsonContentType = ContentType.createContentType(textJsonContentTypeString);
	ContentType otherTextJsonContentType = ContentType.createContentType(textJsonContentTypeString);
	// Then
	assertTrue(textJsonContentType == otherTextJsonContentType);
}