I2C Verification environment using the UVM

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In this model you use in /iic/iic_tb/test/iicPcTest/iicPcTest.svh
phase.raise_objection(this,“iicPcTest”);

What is the difference between uvm_test_done. and phase.?

  •      uvm_test_done.raise_objection(this);  

  •      phase.raise_objection(this,"iicPcTest");

Also, which is better use?
Ben