How to include *_test.go files in HTML coverage reports

Question

I would like to know if there is a way that I can generate an HTML coverage report that also includes statements covered on the tests themselves.

Regarding the merits of doing such a thing, I would like to see that my tests are as useful as the rest of my code. I've become accustomed to including my test code coverage in python and this is something I find helpful.

Update for clarification:

People seem to think I'm talking about testing my tests. I'm not. I just want to see that the statements in my tests are definitely being hit in the HTML coverage report. For example, code coverage on a function in my application might show me that everything's been hit, but it won't necessarily show me that every boundary has been tested. Seeing statements lit up in my test sources show me that I wrote my test well enough. Yes, better factored code shouldn't be so complex as to need that assurance, but sometimes things just aren't better.

Answer 1

I'm not sure I understand the reasoning behind this.

Unit tests, especially in Go, should be simple and straight-forward enough that by just reading them you should be able to spot if a statement is useless.

If that is not the case, maybe you are implementing your unit tests in a way that is too complicated?

If that is the case, I can recommend checking table-driven tests for most cases (not suited for most concurrency-heavy code or methods that depend a lot on manipulating the state, though) as well as trying out TDD (test-driven development).

By using TDD, instead of building your tests in order to try to cover all of your code, you would be writing simple tests that simply validate the specs of your code.

Answer 2

You don't write tests for your tests. Where does it end at that point if you do? Those tests for tests aren't covered. You'll need to write tests for your tests for your tests. But wait! Those tests for your tests for your tests don't have coverage so you better write tests for your tests for your tests for your tests.