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gaia/apps/system/test/unit/lockscreen/source/dom_event_source_test.js

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+/* global DOMEventSource */
+'use strict';
+
+/**
+ * To test if DOMEventSource can really register the events and forward to
+ * the target handler.
+ **/
+requireApp('system/lockscreen/js/source/source_event.js');
+requireApp('system/lockscreen/js/source/dom_event_source.js');
+
+suite('DOMEventSource > ', function() {
+
+  test(`DOMEventSource would forward events from native event listener`,
+  function() {
+    var stubForwardTo = this.sinon.stub();
+    var stubAddEventListener =
+      this.sinon.stub(window, 'addEventListener');
+    var stubRemoveEventListener =
+      this.sinon.stub(window, 'removeEventListener');
+    var source = new DOMEventSource({
+      events: ['foo']
+    });
+    source.start(stubForwardTo);
+    assert.isTrue(stubAddEventListener.called);
+    source.onchange(new CustomEvent('foo'));
+    source.onchange(new CustomEvent('foo'));
+    assert.isTrue(stubForwardTo.calledTwice);
+    source.stop();
+    assert.isTrue(stubRemoveEventListener.called);
+    source.onchange(new CustomEvent('foo'));
+    assert.isFalse(stubForwardTo.calledThrice);
+  });
+});
+

gaia/apps/system/test/unit/lockscreen/source/minute_clock_source_test.js

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+/* global MinuteClockSource */
+'use strict';
+
+/**
+ * To test if MinuteClockSource can really register the events and forward to
+ * the target handler.
+ **/
+requireApp('system/lockscreen/js/source/source_event.js');
+requireApp('system/lockscreen/js/source/minute_clock_source.js');
+
+suite('MinuteClockSource > ', function() {
+
+  test(`MinuteClockSource is a source fire the event every [interval]`,
+  function() {
+    var clock = sinon.useFakeTimers();
+    var stubForwardTo = sinon.stub();
+    var source = new MinuteClockSource({
+      type: 'dummy-ticking'
+    });
+    // Fake clock would stub the clock and make it as at the second 0
+    // of this minute, so it would wait 60 seconds to set the timeout.
+    source.start(stubForwardTo);
+    clock.tick(100);
+    assert.isTrue(stubForwardTo.calledOnce,
+      `it doesn't wait 0 seconds to start ticking`);
+    clock.tick(60000);
+    assert.isTrue(stubForwardTo.calledTwice,
+      `it doesn't tick after the #1 minute`);
+    clock.tick(59000);
+    assert.isFalse(stubForwardTo.calledThrice,
+      `it ticks too more times before the #2 minute`);
+    clock.tick(1000);
+    assert.isTrue(stubForwardTo.calledThrice,
+      `it doesn't tick 3 times after the #2 minute`);
+  });
+});