Added registered UpdateListener to prevent null pointer during testing. Tested clear().
Registered UpdateListener to prevent null pointer exception during testing.
Registered UpdateListener to prevent null pointer exception during testing.
Registered UpdateListener to prevent null pointer exception during testing.
Update toString() test to take into account change to operand format (inclusion of #).
Registered UpdateListener to prevent null pointer exception during testing.
Registered UpdateListener to prevent null pointer exception during testing.
Registered UpdateListener to prevent null pointer exception during testing.
Registered UpdateListener to prevent null pointer exception during testing.