Show line number of test declaration

[jamestalmage]

import test from 'ava';

function macro(t, input, expected) {
    t.is(eval(input), expected);
}

test(macro, '2 + 2', 4);
test(macro, '2 + 3', 5);
test(macro, '2 + 4', 7);

   2 passed
   1 failed


   1. [anonymous]

  t.is(eval(input), expected)
       |    |       |        
       6    "2 + 4" 7        

      Test.macro (foo.js:4:4)

Ideally, we would show the declaration stacktrace as well (i.e. foo.js:9:1 in the above example).

[novemberborn]

I don't think this is macro specific. Rather, we should show the relative file path and line on which a test was declared, perhaps in grey below the test title. So in the following:

foo would be followed by test.js line 3

[novemberborn]

The test() function could obtain a stack trace to figure out the line number. Of course the test could be declared in a separate file, so perhaps it should find the first call site from the test file itself. We need to see what the performance implications are of doing this.