Asking about the Coverage summary in Unit test of angular 2?

问题

When I run test in angular 2 and I see a few keywords output on console command in Coverage Summary section as Statements, Branches, Functions....

And I don't know exactly what is it?

Any help explain this for me, thank you.

回答1:

• Statement: I think this article does a pretty goo d job explaining what a statement it. The coverage tests that all your statements are getting hit.

• Branch: When you use conditionals it create branches

  if (condition) {
    doThis();       // this is a branch
  } else {
    doThat();       // this is a branch
  }
  

  Is your testing hitting all the branches?

• Functions: The functions that you declare.

  class SomeClas {
    methodOne() {}
    methodTwo() {}
  }
  
  it('..', () => {
    new SomeClass().methodOne();
  })
  

  SomeClass has two methods, but only one is getting tested. 50%. If you either explicitly call methodTwo in your test or methodOne calls methodTwo, your coverage goes to 100%

• Lines:: The lines of code, checks to see if all the lines of code are being hit.

来源：https://stackoverflow.com/questions/40017929/asking-about-the-coverage-summary-in-unit-test-of-angular-2