3 files changed, 47 insertions, 2 deletions
diff --git a/source/test/unittests/CMakeLists.txt b/source/test/unittests/CMakeLists.txt
index 674f442..853d896 100644
--- a/source/test/unittests/CMakeLists.txt
+++ b/source/test/unittests/CMakeLists.txt
@@ -2,5 +2,6 @@ target_sources(
   ${KIT_TEST_SUITE}
     PRIVATE
       async_function.test.c test_duration.test.c main.test.c
-      string_ref.test.c array_ref.test.c input_stream.test.c lower_bound.test.c
-      input_buffer.test.c dynamic_array.test.c)
+      string_ref.test.c atomic.test.c thread.test.c array_ref.test.c
+      input_stream.test.c lower_bound.test.c input_buffer.test.c
+      dynamic_array.test.c)
diff --git a/source/test/unittests/atomic.test.c b/source/test/unittests/atomic.test.c
new file mode 100644
index 0000000..9f1a10b
--- /dev/null
+++ b/source/test/unittests/atomic.test.c
@@ -0,0 +1,26 @@
+#include "../../kit/atomic.h"
+
+#define KIT_TEST_FILE atomic
+#include "../../kit_test/test.h"
+
+TEST("atomic store and load") {
+  ATOMIC(int) value;
+  atomic_store_explicit(&value, 20, memory_order_relaxed);
+  REQUIRE(atomic_load_explicit(&value, memory_order_relaxed) == 20);
+}
+
+TEST("atomic exchange") {
+  ATOMIC(int) value;
+  atomic_store_explicit(&value, 20, memory_order_relaxed);
+  REQUIRE(atomic_exchange_explicit(&value, 42,
+                                   memory_order_relaxed) == 20);
+  REQUIRE(atomic_load_explicit(&value, memory_order_relaxed) == 42);
+}
+
+TEST("atomic fetch add") {
+  ATOMIC(int) value;
+  atomic_store_explicit(&value, 20, memory_order_relaxed);
+  REQUIRE(atomic_fetch_add_explicit(&value, 22,
+                                    memory_order_relaxed) == 20);
+  REQUIRE(atomic_load_explicit(&value, memory_order_relaxed) == 42);
+}
diff --git a/source/test/unittests/thread.test.c b/source/test/unittests/thread.test.c
new file mode 100644
index 0000000..fed564b
--- /dev/null
+++ b/source/test/unittests/thread.test.c
@@ -0,0 +1,18 @@
+#include "../../kit/thread.h"
+
+#define KIT_TEST_FILE thread
+#include "../../kit_test/test.h"
+
+static void *test_thread_fn(void *data) {
+  ptrdiff_t *value = (ptrdiff_t *) data;
+  return (void *) (*value + 20);
+}
+
+TEST("run thread") {
+  pthread_t t;
+  ptrdiff_t value = 22;
+  pthread_create(&t, NULL, test_thread_fn, &value);
+  void *result;
+  pthread_join(t, &result);
+  REQUIRE((ptrdiff_t) result == 42);
+}