From ebe3ae4d4d4668f3f47a30f10592714df1c9b803 Mon Sep 17 00:00:00 2001
From: Max Hausch <cheriimoya@googlemail.com>
Date: Wed, 24 Feb 2021 09:32:22 +0100
Subject: [PATCH] buildRustPackage: Add cargoTestFlags

This makes it possible to pass flags to `cargo test`, which is needed if
a crate is compiled with custom feature flags.
---
 doc/languages-frameworks/rust.section.md          | 7 +++++++
 pkgs/build-support/rust/hooks/cargo-check-hook.sh | 3 ++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/doc/languages-frameworks/rust.section.md b/doc/languages-frameworks/rust.section.md
index 48510b37add3..a3f0238bf3a1 100644
--- a/doc/languages-frameworks/rust.section.md
+++ b/doc/languages-frameworks/rust.section.md
@@ -193,6 +193,13 @@ rustPlatform.buildRustPackage {
 Please note that the code will be compiled twice here: once in `release` mode
 for the `buildPhase`, and again in `debug` mode for the `checkPhase`.
 
+Test flags, e.g., `--features xxx/yyy`, can be passed to `cargo test` via the
+`cargoTestFlags` attribute.
+
+Another attribute, called `checkFlags`, is used to pass arguments to the test
+binary itself, as stated
+(here)[https://doc.rust-lang.org/cargo/commands/cargo-test.html].
+
 #### Tests relying on the structure of the `target/` directory
 
 Some tests may rely on the structure of the `target/` directory. Those tests
diff --git a/pkgs/build-support/rust/hooks/cargo-check-hook.sh b/pkgs/build-support/rust/hooks/cargo-check-hook.sh
index 82e669af3a08..bc913c6ab074 100644
--- a/pkgs/build-support/rust/hooks/cargo-check-hook.sh
+++ b/pkgs/build-support/rust/hooks/cargo-check-hook.sh
@@ -1,4 +1,5 @@
 declare -a checkFlags
+declare -a cargoTestFlags
 
 cargoCheckHook() {
     echo "Executing cargoCheckHook"
@@ -15,7 +16,7 @@ cargoCheckHook() {
         threads=1
     fi
 
-    argstr="--${cargoCheckType} --target @rustTargetPlatformSpec@ --frozen";
+    argstr="--${cargoCheckType} --target @rustTargetPlatformSpec@ --frozen ${cargoTestFlags}";
 
     (
         set -x