feat(unstable): deno test --coverage (#6901)

This commit adds basic support for collecting coverage
data using "deno test". 

Currently the report is only a text added to the end
of output from "deno test".

1 files changed, 5 insertions, 0 deletions

diff --git a/cli/tests/test_coverage.ts b/cli/tests/test_coverage.ts
new file mode 100644
index 000000000..72844422f
--- /dev/null
+++ b/cli/tests/test_coverage.ts
@@ -0,0 +1,5 @@
+import { returnsHi } from "./subdir/mod1.ts";
+
+Deno.test("returnsHiSuccess", function () {
+  returnsHi();
+});