Intercepting test failures to provide additional context

Question

TL;DR: Is there any known hack to capture and/or print additional context when a Golang test fails? (using standard library testing)

Example:

func TestSomething(t *testing.T) {
  ...
  ...
  if ... {
    t.Fatalf("Something went wrong!")
  }

I would like to attach some generic function to be invoked before the test returns, e.g. debug.PrintStack()

I am working on a large codebase with hundreds of tests.

• Moving to a different testing library is not an option
• Modifying each test is not an option (e.g. add defer)
• I'd really like to avoid re-implementing go test logic...
• (the actual use case is not debug.PrintStack() -- I want to notify some other system of the test failure)

I can see from testing documentation and code that this is not supported.

However I also know if one is determined enough, this is possible, and I am hoping someone can point to some clever hack I can take inspiration from.