~/p/elixir (v1.11|✚1…) $ git diff
diff --git a/lib/mix/test/mix/tasks/compile_test.exs b/lib/mix/test/mix/tasks/compile_test.exs
index c7a8f3369..845e90b86 100644
--- a/lib/mix/test/mix/tasks/compile_test.exs
+++ b/lib/mix/test/mix/tasks/compile_test.exs
@@ -233,7 +233,7 @@ test "loads Mix config with --erl-config" do
   end

   test "runs after_compiler callback once" do
-    in_fixture("no_mixfile", fn ->
+    in_fixture("umbrella_dep", fn ->
       callback = fn result -> send(self(), result) end

~/p/elixir (v1.11|✚1…) $ make test_mix
....
  1) test runs after_compiler callback once (Mix.Tasks.CompileTest)
     test/mix/tasks/compile_test.exs:235
     Assertion failed, no matching message after 0ms
     Showing 2 of 2 messages in the mailbox
     code: assert_received {:ok, []}
     mailbox:
       pattern: {:ok, []}
       value:   {:noop, []}

       pattern: {:ok, []}
       value:   {:mix_shell, :info, ["Generated sample app"]}
     stacktrace:
       test/mix/tasks/compile_test.exs:241: anonymous fn/0 in Mix.Tasks.CompileTest."test runs after_compiler callback once"/1
       (elixir 1.11.3) lib/file.ex:1553: File.cd!/2
       test/test_helper.exs:126: MixTest.Case.in_fixture/3
       test/mix/tasks/compile_test.exs:236: (test)

"files.associations": {
    "**/*.html": "html",
    "**/*.html.eex": "html"
  },

"emmet.includeLanguages": {
    "javascript": "javascriptreact",
    "HTML (Eex)": "html"
  },