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diff --git a/tests/test-clock-watcher.cpp b/tests/test-clock-watcher.cpp
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+/*
+ * Copyright 2014 Canonical Ltd.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 3, as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranties of
+ * MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *   Charles Kerr <charles.kerr@canonical.com>
+ */
+
+#include <datetime/clock-watcher.h>
+
+#include <gtest/gtest.h>
+
+#include "state-fixture.h"
+
+using namespace unity::indicator::datetime;
+
+class ClockWatcherFixture: public StateFixture
+{
+private:
+
+    typedef StateFixture super;
+
+protected:
+
+    std::vector<std::string> m_triggered;
+    std::unique_ptr<ClockWatcher> m_watcher;
+
+    void SetUp()
+    {
+        super::SetUp();
+
+        m_watcher.reset(new ClockWatcherImpl(m_state));
+        m_watcher->alarm_reached().connect([this](const Appointment& appt){
+            m_triggered.push_back(appt.uid);
+        });
+
+        EXPECT_TRUE(m_triggered.empty());
+    }
+
+    void TearDown()
+    {
+        m_triggered.clear();
+        m_watcher.reset();
+
+        super::TearDown();
+    }
+
+    std::vector<Appointment> build_some_appointments()
+    {
+        const auto now = m_state->clock->localtime();
+        auto tomorrow = g_date_time_add_days (now.get(), 1);
+        auto tomorrow_begin = g_date_time_add_full (tomorrow, 0, 0, 0,
+                                                    -g_date_time_get_hour(tomorrow),
+                                                    -g_date_time_get_minute(tomorrow),
+                                                    -g_date_time_get_seconds(tomorrow));
+        auto tomorrow_end = g_date_time_add_full (tomorrow_begin, 0, 0, 1, 0, 0, -1);
+
+        Appointment a1; // an alarm clock appointment
+        a1.color = "red";
+        a1.summary = "Alarm";
+        a1.summary = "http://www.example.com/";
+        a1.uid = "example";
+        a1.has_alarms = true;
+        a1.begin = tomorrow_begin;
+        a1.end = tomorrow_end;
+
+        auto ubermorgen_begin = g_date_time_add_days (tomorrow, 1);
+        auto ubermorgen_end = g_date_time_add_full (tomorrow_begin, 0, 0, 1, 0, 0, -1);
+
+        Appointment a2; // a non-alarm appointment
+        a2.color = "green";
+        a2.summary = "Other Text";
+        a2.summary = "http://www.monkey.com/";
+        a2.uid = "monkey";
+        a2.has_alarms = false;
+        a2.begin = ubermorgen_begin;
+        a2.end = ubermorgen_end;
+
+        // cleanup
+        g_date_time_unref(ubermorgen_end);
+        g_date_time_unref(ubermorgen_begin);
+        g_date_time_unref(tomorrow_end);
+        g_date_time_unref(tomorrow_begin);
+        g_date_time_unref(tomorrow);
+
+        return std::vector<Appointment>({a1, a2});
+    }
+};
+
+/***
+****
+***/
+
+TEST_F(ClockWatcherFixture, AppointmentsChanged)
+{
+    // Add some appointments to the planner.
+    // One of these matches our state's localtime, so that should get triggered.
+    std::vector<Appointment> a = build_some_appointments();
+    a[0].begin = m_state->clock->localtime();
+    m_state->planner->upcoming.set(a);
+
+    // Confirm that it got fired
+    EXPECT_EQ(1, m_triggered.size());
+    EXPECT_EQ(a[0].uid, m_triggered[0]);
+}
+
+
+TEST_F(ClockWatcherFixture, TimeChanged)
+{
+    // Add some appointments to the planner.
+    // Neither of these match the state's localtime, so nothing should be triggered.
+    std::vector<Appointment> a = build_some_appointments();
+    m_state->planner->upcoming.set(a);
+    EXPECT_TRUE(m_triggered.empty());
+
+    // Set the state's clock to a time that matches one of the appointments.
+    // That appointment should get triggered.
+    m_mock_state->mock_clock->set_localtime(a[1].begin);
+    EXPECT_EQ(1, m_triggered.size());
+    EXPECT_EQ(a[1].uid, m_triggered[0]);
+}
+
+
+TEST_F(ClockWatcherFixture, MoreThanOne)
+{
+    const auto now = m_state->clock->localtime();
+    std::vector<Appointment> a = build_some_appointments();
+    a[0].begin = a[1].begin = now;
+    m_state->planner->upcoming.set(a);
+
+    EXPECT_EQ(2, m_triggered.size());
+    EXPECT_EQ(a[0].uid, m_triggered[0]);
+    EXPECT_EQ(a[1].uid, m_triggered[1]);
+}
+
+
+TEST_F(ClockWatcherFixture, NoDuplicates)
+{
+    // Setup: add an appointment that gets triggered.
+    const auto now = m_state->clock->localtime();
+    const std::vector<Appointment> appointments = build_some_appointments();
+    std::vector<Appointment> a;
+    a.push_back(appointments[0]);
+    a[0].begin = now;
+    m_state->planner->upcoming.set(a);
+    EXPECT_EQ(1, m_triggered.size());
+    EXPECT_EQ(a[0].uid, m_triggered[0]);
+
+    // Now change the appointment vector by adding one to it.
+    // Confirm that the ClockWatcher doesn't re-trigger a[0]
+    a.push_back(appointments[1]);
+    m_state->planner->upcoming.set(a);
+    EXPECT_EQ(1, m_triggered.size());
+    EXPECT_EQ(a[0].uid, m_triggered[0]);
+}