https://bugs.gentoo.org/935370
https://github.com/BLAKE3-team/BLAKE3/pull/405

From aad68f7f009b7e0607b3eee3b8b8e3021fa38bd7 Mon Sep 17 00:00:00 2001
From: matoro <matoro@users.noreply.github.com>
Date: Tue, 2 Jul 2024 19:36:45 -0400
Subject: [PATCH] build(CMake): support running tests with ctest

---
 CMakeLists.txt | 11 +++++++++++
 test.py        |  4 ++--
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3a3b232d..e778e3d7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -168,6 +168,17 @@ else()
   BLAKE3_DISABLE_SIMD()
 endif()
 
+# cmake test support
+if (BLAKE3_BUILD_TESTING)
+  find_package(Python3 REQUIRED)
+  get_target_property(BLAKE3_SOURCES blake3 SOURCES)
+  add_executable(blake3-testing ${BLAKE3_SOURCES} main.c)
+  set_property(TARGET blake3-testing PROPERTY OUTPUT_NAME blake3)
+  target_compile_definitions(blake3-testing PRIVATE BLAKE3_TESTING=1)
+  enable_testing()
+  add_test(test_vectors "${Python3_EXECUTABLE}" "${CMAKE_CURRENT_SOURCE_DIR}/test.py" WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
+endif()
+
 # cmake install support
 install(FILES blake3.h DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
 install(TARGETS blake3 EXPORT blake3-targets)
diff --git a/test.py b/test.py
index 98b1c3df..2eb1f07e 100755
--- a/test.py
+++ b/test.py
@@ -2,7 +2,7 @@
 
 from binascii import hexlify
 import json
-from os import path
+from os import getcwd, path
 import subprocess
 
 HERE = path.dirname(__file__)
@@ -11,7 +11,7 @@
 
 
 def run_blake3(args, input):
-    output = subprocess.run([path.join(HERE, "blake3")] + args,
+    output = subprocess.run([path.join(getcwd(), "blake3")] + args,
                             input=input,
                             stdout=subprocess.PIPE,
                             check=True)