How to test ENUMs using JUNIT

assertEquals("FRAME", CosProfileType.FRAME.name());

It will work only when field and value both are same but won't wotk for below:

FRAME ("frame_value")

Better to check with

assertEquals("FRAME", CosProfileType.FRAME.getFieldName());

You are comparing and String to an Enum that will never be equal.

Try:

@Test
public void testAdd() {
    TrafficProfileExtension ext = new TrafficProfileExtension();
    assertEquals("FRAME", ext.CosProfileType.FRAME.toString());

}

Since CosProfileType is declared public static it is effectively a top level class (enum) so you could do

assertEquals("FRAME", CosProfileType.FRAME.name());