From 0917e2ae279c5974f1a5028a48d2e8a808e0e7bb Mon Sep 17 00:00:00 2001
From: sternenseemann <0rpkxez4ksa01gb3typccl0i@systemli.org>
Date: Sat, 19 Jun 2021 21:49:14 +0200
Subject: [PATCH] haskellPackages.tasty-discover: run test suite in native case

For native compilation, we can just add the intermediary build
directory to `PATH` which allows the test suite to be preprocessed by
tasty-discover itself.

When cross-compiling, `doCheck` will be false anyways and this won't
matter (fingers crossed!).
---
 pkgs/development/haskell-modules/configuration-common.nix | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index 8fe82094d54e..2c32d81cf357 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -478,7 +478,11 @@ self: super: {
   doctest-discover = dontCheck super.doctest-discover;
 
   # Depends on itself for testing
-  tasty-discover = dontCheck super.tasty-discover;
+  tasty-discover = overrideCabal super.tasty-discover (drv: {
+    preBuild = ''
+      export PATH="$PWD/dist/build/tasty-discover:$PATH"
+    '' + (drv.preBuild or "");
+  });
 
   # Known issue with nondeterministic test suite failure
   # https://github.com/nomeata/tasty-expected-failure/issues/21