diff --git a/libc/cmake/modules/LLVMLibCRules.cmake b/libc/cmake/modules/LLVMLibCRules.cmake
--- a/libc/cmake/modules/LLVMLibCRules.cmake
+++ b/libc/cmake/modules/LLVMLibCRules.cmake
@@ -355,7 +355,7 @@
     ${LIBC_UNITTEST_DEPENDS}
   )
 
-  target_link_libraries(${target_name} PRIVATE LibcUnitTest)
+  target_link_libraries(${target_name} PRIVATE LibcUnitTest libc_test_utils)
 
   add_custom_command(
     TARGET ${target_name}
diff --git a/libc/utils/CMakeLists.txt b/libc/utils/CMakeLists.txt
--- a/libc/utils/CMakeLists.txt
+++ b/libc/utils/CMakeLists.txt
@@ -2,3 +2,4 @@
 add_subdirectory(HdrGen)
 add_subdirectory(UnitTest)
 add_subdirectory(benchmarks)
+add_subdirectory(testutils)
diff --git a/libc/utils/testutils/CMakeLists.txt b/libc/utils/testutils/CMakeLists.txt
new file mode 100644
--- /dev/null
+++ b/libc/utils/testutils/CMakeLists.txt
@@ -0,0 +1,11 @@
+
+add_library(
+  libc_test_utils
+  Support.h
+  Thread.cpp
+  Thread.h
+)
+
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
+  target_sources(libc_test_utils PRIVATE ${LIBC_TARGET_OS}/sleep.cpp)
+endif()
diff --git a/libc/utils/testutils/Support.h b/libc/utils/testutils/Support.h
new file mode 100644
--- /dev/null
+++ b/libc/utils/testutils/Support.h
@@ -0,0 +1,21 @@
+//===------------ Declaration of test support utilities ---------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_UTILS_TESTUTILS_SUPPORT_H
+#define LLVM_LIBC_UTILS_TESTUTILS_SUPPORT_H
+
+namespace __llvm_libc {
+namespace testutils {
+
+extern "C" void abort();
+int sleep(unsigned int seconds);
+
+} // namespace testutils
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_UTILS_TESTUTILS_SUPPORT_H
diff --git a/libc/utils/testutils/Thread.h b/libc/utils/testutils/Thread.h
new file mode 100644
--- /dev/null
+++ b/libc/utils/testutils/Thread.h
@@ -0,0 +1,63 @@
+//===---- A Thread class which is a wrapper over std::thread ----*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_UTILS_TESTUTILS_THREAD_H
+#define LLVM_LIBC_UTILS_TESTUTILS_THREAD_H
+
+namespace __llvm_libc {
+namespace testutils {
+
+class Thread {
+private:
+  class ClassWithCall {
+  public:
+    virtual ~ClassWithCall() {}
+    virtual void call() = 0;
+  };
+
+  class Caller {
+  private:
+    ClassWithCall *Callee;
+
+  public:
+    explicit Caller(ClassWithCall *C) : Callee(C) {}
+
+    void operator()() { Callee->call(); }
+  };
+
+  template <typename Callable>
+  class GenericClassWithCall : public ClassWithCall {
+  public:
+    explicit GenericClassWithCall(Callable C) : TheCallable(C) {}
+
+    void call() override { TheCallable(); }
+
+  private:
+    Callable TheCallable;
+  };
+
+  void startThread(Caller C);
+
+public:
+  template <typename Callable>
+  Thread(Callable C) : WithCallObj(new GenericClassWithCall<Callable>(C)) {
+    Caller TheCaller(WithCallObj);
+    startThread(TheCaller);
+  }
+
+  void join();
+
+private:
+  ClassWithCall *WithCallObj;
+  void *StdThreadPtr;
+};
+
+} // namespace testutils
+} // namespace __llvm_libc
+
+#endif // LLVM_LIBC_UTILS_TESTUTILS_THREAD_H
diff --git a/libc/utils/testutils/Thread.cpp b/libc/utils/testutils/Thread.cpp
new file mode 100644
--- /dev/null
+++ b/libc/utils/testutils/Thread.cpp
@@ -0,0 +1,27 @@
+//===-- Implementation of the Thread class as a wrapper over std::thread --===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "Thread.h"
+
+#include <thread>
+
+namespace __llvm_libc {
+namespace testutils {
+
+void Thread::startThread(Thread::Caller C) {
+  StdThreadPtr = new std::thread(C);
+}
+
+void Thread::join() {
+  reinterpret_cast<std::thread *>(StdThreadPtr)->join();
+  delete reinterpret_cast<std::thread *>(StdThreadPtr);
+  delete WithCallObj;
+}
+
+} // namespace testutils
+} // namespace __llvm_libc
diff --git a/libc/utils/testutils/linux/sleep.cpp b/libc/utils/testutils/linux/sleep.cpp
new file mode 100644
--- /dev/null
+++ b/libc/utils/testutils/linux/sleep.cpp
@@ -0,0 +1,17 @@
+//===---------------- Wrapper over the linux sleep function ---------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <unistd.h>
+
+namespace __llvm_libc {
+namespace testutils {
+
+int sleep(unsigned int Seconds) { return ::sleep(Seconds); }
+
+} // namespace testutils
+} // namespace __llvm_libc