diff --git a/tests/pthread_test.cpp b/tests/pthread_test.cpp
index 4c59bd4..5ce7d4d 100644
--- a/tests/pthread_test.cpp
+++ b/tests/pthread_test.cpp
@@ -3164,3 +3164,12 @@
   ASSERT_ERRNO(0);
 #pragma clang diagnostic pop
 }
+
+TEST(pthread, pthread_setaffinity) {
+  cpu_set_t set;
+  CPU_ZERO(&set);
+  ASSERT_EQ(0, pthread_getaffinity_np(pthread_self(), sizeof(set), &set));
+  // It's hard to make any more general claim than this,
+  // but it ought to be safe to ask for the same affinity you already have.
+  ASSERT_EQ(0, pthread_setaffinity_np(pthread_self(), sizeof(set), &set));
+}
diff --git a/tests/sched_test.cpp b/tests/sched_test.cpp
index 8e65057..448fae9 100644
--- a/tests/sched_test.cpp
+++ b/tests/sched_test.cpp
@@ -328,3 +328,12 @@
   ASSERT_ERRNO(EINVAL);
 #pragma clang diagnostic pop
 }
+
+TEST(pthread, sched_setaffinity) {
+  cpu_set_t set;
+  CPU_ZERO(&set);
+  ASSERT_EQ(0, sched_getaffinity(getpid(), sizeof(set), &set));
+  // It's hard to make any more general claim than this,
+  // but it ought to be safe to ask for the same affinity you already have.
+  ASSERT_EQ(0, sched_setaffinity(getpid(), sizeof(set), &set));
+}