test_runner: add coverage support with watch mode. #51253
Description
What is the problem this feature will solve?
Currently, we can't get coverage report along with watch flag.
code:
import test from "node:test";
test("foo", () => {});run cmd ./node/node --test --watch --experimental-test-coverage
output:
pulkitgupta@Pulkits-MacBook-Air jest-2 % ../node/node --test --watch --experimental-test-coverage
✔ foo (0.867791ms)
^C%
pulkitgupta@Pulkits-MacBook-Air jest-2 % no coverage report.
What is the feature you are proposing to solve the problem?
To show test coverage with watch mode, (something similar what jest does).
output:
pulkitgupta@Pulkits-MacBook-Air jest-2 % ../node/node --test --watch --experimental-test-coverage
✔ foo (1.044042ms)
ℹ start of coverage report
ℹ ---------------------------------------------------------------
ℹ file | line % | branch % | funcs % | uncovered lines
ℹ ---------------------------------------------------------------
ℹ index.test.mjs | 100.00 | 100.00 | 100.00 |
ℹ ---------------------------------------------------------------
ℹ all files | 100.00 | 100.00 | 100.00 |
ℹ ---------------------------------------------------------------
ℹ end of coverage report
^C% What alternatives have you considered?
No response