ExUnit sets a process label for each test (#14758)

Author: nathanl

lib/ex_unit/lib/ex_unit/runner.ex

@@ -440,6 +440,7 @@ defmodule ExUnit.Runner do
          context
        ) do
     spawn_monitor(fn ->
+      Process.set_label({test.case, test.name})
       ExUnit.OnExitHandler.register(self())
       generate_test_seed(seed, test, rand_algorithm)
       context = context |> Map.merge(test.tags) |> Map.put(:test_pid, self())

lib/ex_unit/test/ex_unit_test.exs

@@ -1234,6 +1234,14 @@ defmodule ExUnitTest do
     end
   end
 
+  test "sets process label for each test" do
+    # TODO: Remove check once we support Erlang/OTP 27+
+    if function_exported?(:proc_lib, :get_label, 1) do
+      label = apply(:proc_lib, :get_label, [self()])
+      assert label == {ExUnitTest, :"test sets process label for each test"}
+    end
+  end
+
   defp configure_and_reload_on_exit(opts) do
     old_opts = ExUnit.configuration()