diff --git a/test/source/event.cpp b/test/source/event.cpp
new file mode 100644
index 0000000..5f19e81
--- /dev/null
+++ b/test/source/event.cpp
@@ -0,0 +1,152 @@
+#include <cerrno>
+#include <functional>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <memory>
+#include <sdeventplus/event.hpp>
+#include <sdeventplus/exception.hpp>
+#include <sdeventplus/source/event.hpp>
+#include <sdeventplus/test/sdevent.hpp>
+#include <systemd/sd-event.h>
+#include <utility>
+
+namespace sdeventplus
+{
+namespace source
+{
+namespace
+{
+
+using testing::DoAll;
+using testing::Return;
+using testing::SaveArg;
+using testing::SetArgPointee;
+
+using UniqueEvent = std::unique_ptr<sdeventplus::Event,
+                                    std::function<void(sdeventplus::Event*)>>;
+
+class EventTest : public testing::Test
+{
+  protected:
+    testing::StrictMock<test::SdEventMock> mock;
+    sd_event_source* const expected_source =
+        reinterpret_cast<sd_event_source*>(1234);
+    sd_event* const expected_event = reinterpret_cast<sd_event*>(2345);
+    UniqueEvent event = make_event(expected_event);
+
+    UniqueEvent make_event(sd_event* event)
+    {
+        auto deleter = [this, event](sdeventplus::Event* e) {
+            EXPECT_CALL(this->mock, sd_event_unref(event))
+                .WillOnce(Return(nullptr));
+            delete e;
+        };
+        return UniqueEvent(
+            new sdeventplus::Event(event, std::false_type(), &mock), deleter);
+    }
+
+    void expect_destruct()
+    {
+        {
+            testing::InSequence sequence;
+            EXPECT_CALL(mock, sd_event_source_set_enabled(expected_source,
+                                                          SD_EVENT_OFF))
+                .WillOnce(Return(0));
+            EXPECT_CALL(mock, sd_event_source_unref(expected_source))
+                .WillOnce(Return(nullptr));
+        }
+        EXPECT_CALL(mock, sd_event_unref(expected_event))
+            .WillOnce(Return(nullptr));
+    }
+};
+
+TEST_F(EventTest, DeferConstruct)
+{
+    EXPECT_CALL(mock, sd_event_ref(expected_event))
+        .WillOnce(Return(expected_event));
+    void* userdata;
+    EXPECT_CALL(mock, sd_event_source_set_userdata(expected_source, testing::_))
+        .WillOnce(DoAll(SaveArg<1>(&userdata), Return(nullptr)));
+    sd_event_handler_t handler;
+    EXPECT_CALL(mock, sd_event_add_defer(expected_event, testing::_, testing::_,
+                                         nullptr))
+        .WillOnce(DoAll(SetArgPointee<1>(expected_source), SaveArg<2>(&handler),
+                        Return(0)));
+    int completions = 0;
+    Event::Callback callback = [&completions](Event&) { completions++; };
+    Defer defer(*event, std::move(callback));
+    EXPECT_EQ(&defer, userdata);
+    EXPECT_FALSE(callback);
+    EXPECT_EQ(0, completions);
+
+    EXPECT_EQ(0, handler(nullptr, &defer));
+    EXPECT_EQ(1, completions);
+
+    expect_destruct();
+}
+
+TEST_F(EventTest, PostConstruct)
+{
+    EXPECT_CALL(mock, sd_event_ref(expected_event))
+        .WillOnce(Return(expected_event));
+    void* userdata;
+    EXPECT_CALL(mock, sd_event_source_set_userdata(expected_source, testing::_))
+        .WillOnce(DoAll(SaveArg<1>(&userdata), Return(nullptr)));
+    sd_event_handler_t handler;
+    EXPECT_CALL(mock, sd_event_add_post(expected_event, testing::_, testing::_,
+                                        nullptr))
+        .WillOnce(DoAll(SetArgPointee<1>(expected_source), SaveArg<2>(&handler),
+                        Return(0)));
+    int completions = 0;
+    Event::Callback callback = [&completions](Event&) { completions++; };
+    Post post(*event, std::move(callback));
+    EXPECT_EQ(&post, userdata);
+    EXPECT_FALSE(callback);
+    EXPECT_EQ(0, completions);
+
+    EXPECT_EQ(0, handler(nullptr, &post));
+    EXPECT_EQ(1, completions);
+
+    expect_destruct();
+}
+
+TEST_F(EventTest, ExitConstruct)
+{
+    EXPECT_CALL(mock, sd_event_ref(expected_event))
+        .WillOnce(Return(expected_event));
+    void* userdata;
+    EXPECT_CALL(mock, sd_event_source_set_userdata(expected_source, testing::_))
+        .WillOnce(DoAll(SaveArg<1>(&userdata), Return(nullptr)));
+    sd_event_handler_t handler;
+    EXPECT_CALL(mock, sd_event_add_exit(expected_event, testing::_, testing::_,
+                                        nullptr))
+        .WillOnce(DoAll(SetArgPointee<1>(expected_source), SaveArg<2>(&handler),
+                        Return(0)));
+    int completions = 0;
+    Event::Callback callback = [&completions](Event&) { completions++; };
+    Exit exit(*event, std::move(callback));
+    EXPECT_EQ(&exit, userdata);
+    EXPECT_FALSE(callback);
+    EXPECT_EQ(0, completions);
+
+    EXPECT_EQ(0, handler(nullptr, &exit));
+    EXPECT_EQ(1, completions);
+
+    expect_destruct();
+}
+
+TEST_F(EventTest, ConstructFailure)
+{
+    EXPECT_CALL(mock, sd_event_add_defer(expected_event, testing::_, testing::_,
+                                         nullptr))
+        .WillOnce(Return(-EINVAL));
+    int completions = 0;
+    Event::Callback callback = [&completions](Event&) { completions++; };
+    EXPECT_THROW(Defer(*event, std::move(callback)), SdEventError);
+    EXPECT_TRUE(callback);
+    EXPECT_EQ(0, completions);
+}
+
+} // namespace
+} // namespace source
+} // namespace sdeventplus