Writing the first test class in UVM

In UVM, how does a test connect with environment and create stimulus?

Here comes the answer

• create a test derived from "uvm_test"

e.g

class tx_test  extends  uvm_test;

 

    `uvm_component_utils (tx_test)

 

      function new (string  name, uvm_component parent);

         super.new(name,parent);

      endfunction

      tx_env        env;         // define env handle

      virtual function void build_phase (uvm_phase phase);

        env  = tx_env :: type_id :: create("env", this);

      endfunction

    virtual task  run_phase (uvm_phase  phase);

         tx_sequence  seq ; // define the sequence handle

         seq  =  tx_sequence :: type_id :: create ("seq", this);

         phase.raise_objection (this);

         seq.start(env.sqr.start);

         phase.drop_objection(this);

     endtask

endclass