diff --git a/Tests/LibThreading/CMakeLists.txt b/Tests/LibThreading/CMakeLists.txt
new file mode 100644
index 00000000000000..40021e9d4a5d85
--- /dev/null
+++ b/Tests/LibThreading/CMakeLists.txt
@@ -0,0 +1,4 @@
+file(GLOB TEST_SOURCES CONFIGURE_DEPENDS "*.cpp")
+foreach(source ${TEST_SOURCES})
+    serenity_test(${source} LibThreading LIBS LibThreading LibPthread)
+endforeach()
diff --git a/Tests/LibThreading/TestThread.cpp b/Tests/LibThreading/TestThread.cpp
new file mode 100644
index 00000000000000..8d5c7eae48099a
--- /dev/null
+++ b/Tests/LibThreading/TestThread.cpp
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2021, Spencer Dixon <spencercdixon@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibTest/TestCase.h>
+#include <LibThreading/Thread.h>
+#include <unistd.h>
+
+TEST_CASE(threads_can_detach)
+{
+    int should_be_42 = 0;
+
+    auto thread = Threading::Thread::construct([&should_be_42]() {
+        usleep(10 * 1000);
+        should_be_42 = 42;
+        return 0;
+    });
+    thread->start();
+    thread->detach();
+    usleep(20 * 1000);
+
+    EXPECT(should_be_42 == 42);
+}
+
+TEST_CASE(joining_detached_thread_errors)
+{
+    auto thread = Threading::Thread::construct([]() { return 0; });
+    thread->start();
+    thread->detach();
+
+    EXPECT(thread->join().is_error());
+}