diff --git a/tests/test_olg_scheduler.cpp b/tests/test_olg_scheduler.cpp
index 7e027ef..13e6b0c 100644
--- a/tests/test_olg_scheduler.cpp
+++ b/tests/test_olg_scheduler.cpp
@@ -103,6 +103,12 @@ TEST(TestOlgScheduler, EventLoopBasic)
     EXPECT_THAT(evl.getTree()[1U], IsNull());
     EXPECT_FALSE(evl.isEmpty());
 
+    // Check the type ID.
+    constexpr std::array<std::uint8_t, 16> expected_type_id =
+        {0xB6, 0x87, 0x48, 0xA6, 0x7A, 0xDB, 0x4D, 0xF1, 0xB3, 0x1D, 0xA9, 0x8D, 0x50, 0xA7, 0x82, 0x47};
+    const auto actual_type_id = decltype(evt_a)::_get_type_id_();
+    EXPECT_THAT(actual_type_id, testing::ElementsAreArray(expected_type_id));
+
     auto evt_b = evl.repeat(100ms,  // Smaller deadline goes on the left.
                             [&](const auto& arg) { b.emplace(arg); });
     EXPECT_THAT(evl.getTree()[0U]->getDeadline().value().time_since_epoch(), 10'100ms);