How to collect coverage of .test.ts files?

[effigies]

Hi all. I typically collect coverage information on my test files as well as my main files, so that I can see if a test is failing to run or a branch is never hit.

It looks like deno coverage has an --exclude flag that defaults to excluding .test.ts and similar files, but either I don't know how to disable it (I tried --excludes=^$) or deno test --coverage doesn't collect this coverage data in the first place.

ref: Don’t omit tests from coverage

[bartlomieju]

It looks like deno coverage has an --exclude flag that defaults to excluding .test.ts and similar files, but either I don't know how to disable it (I tried --excludes=^$) or deno test --coverage doesn't collect this coverage data in the first place.

The last sentence is correct. The test files are explicitly opted out of coverage and their reports are not written to disk.

[effigies]

Is there a way to enable them?

[bartlomieju]

Not at the moment, this is hardcoded here:

deno/cli/tools/coverage/mod.rs

Lines 439 to 459 in 7aa22da

	coverages
	.into_iter()
	.filter(|e| {
	let is_internal = e.url.starts_with("ext:")
	|| e.url.starts_with("data:")
	|| e.url.ends_with("__anonymous__")
	|| e.url.ends_with("$deno$test.mjs")
	|| e.url.contains("/$deno$stdin.")
	|| e.url.ends_with(".snap")
	|| is_supported_test_path(Path::new(e.url.as_str()))
	|| doc_test_re.is_match(e.url.as_str())
	|| Url::parse(&e.url)
	.ok()
	.map(|url| in_npm_pkg_checker.in_npm_package(&url))
	.unwrap_or(false);
	let is_included = include.iter().any(|p| p.is_match(&e.url));
	let is_excluded = exclude.iter().any(|p| p.is_match(&e.url));
	(include.is_empty() || is_included) && !is_excluded && !is_internal
	})

I'll be happy to accept a PR that makes it configurable.