diff --git a/tests/utils.py b/tests/cmake.py
similarity index 67%
rename from tests/utils.py
rename to tests/cmake.py
index 6123626..b8c8f69 100644
--- a/tests/utils.py
+++ b/tests/cmake.py
@@ -1,15 +1,15 @@
-#!/usr/bin/env python3
-
 from typing import List
 from subprocess import Popen, PIPE
 
 """
-Utility functions needed by all test scripts.
+Helper functions to run CMake commands.
 """
 
 
-def run_process(args: List[str], cwd=None):
-    with Popen(args, stdout=PIPE, stderr=PIPE, bufsize=1, universal_newlines=True, cwd=cwd) as p:
+def run_process(args: List[str], cwd=None) -> int:
+    with Popen(
+        args, stdout=PIPE, stderr=PIPE, bufsize=1, universal_newlines=True, cwd=cwd
+    ) as p:
         for line in p.stdout:
             print(line, end="")
         for line in p.stderr:
diff --git a/tests/data/mini_c_test/CMakeLists.txt b/tests/data/mini_c_test/CMakeLists.txt
index c59b31c..01ce02e 100644
--- a/tests/data/mini_c_test/CMakeLists.txt
+++ b/tests/data/mini_c_test/CMakeLists.txt
@@ -15,7 +15,7 @@ include(FetchContent)
 FetchContent_Declare(
     googletest
     GIT_REPOSITORY https://github.com/google/googletest.git
-    GIT_TAG release-1.12.1
+    GIT_TAG v1.15.2
 )
 
 if(WIN32)
diff --git a/tests/mini_c_test.py b/tests/mini_c_test.py
index d65c9e6..2808964 100644
--- a/tests/mini_c_test.py
+++ b/tests/mini_c_test.py
@@ -1,12 +1,10 @@
-#!/usr/bin/env python3
-
+from pathlib import Path
 from platform import system
 
-from .utils import *
+from .cmake import cmake_configure, cmake_build_target
 
 
 class TestMiniCProject:
-
     def test_build_and_test_mini_c_gmock(self):
         project_dir = "tests/data/mini_c_test"
         build_dir = f"{project_dir}/build"
@@ -26,3 +24,4 @@ def test_build_and_test_mini_c_gmock(self):
         exit_code = cmake_build_target(build_dir, "all")
         """CMake build shall be successful. The build includes the unit tests here."""
         assert exit_code == 0
+        assert Path(binary).exists()