Scroll down button: when scrolled up, or new non-visible message

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test/views/scroll_down_button_view_test.js

@@ -0,0 +1,40 @@
+/*
+ * vim: ts=4:sw=4:expandtab
+ */
+describe('ScrollDownButtonView', function() {
+    // TODO: in electron branch, where we have access to real i18n, uncomment assertions against real strings
+
+    it('renders with count = 0', function() {
+        var view = new Whisper.ScrollDownButtonView();
+        view.render();
+        assert.equal(view.count, 0);
+        // assert.match(view.$el.html(), /Scroll to bottom/);
+    });
+
+    it('renders with count = 1', function() {
+        var view = new Whisper.ScrollDownButtonView({count: 1});
+        view.render();
+        assert.equal(view.count, 1);
+        assert.match(view.$el.html(), /new-messages/);
+        // assert.match(view.$el.html(), /New message below/);
+    });
+
+    it('renders with count = 2', function() {
+        var view = new Whisper.ScrollDownButtonView({count: 2});
+        view.render();
+        assert.equal(view.count, 2);
+
+        assert.match(view.$el.html(), /new-messages/);
+        // assert.match(view.$el.html(), /New messages below/);
+    });
+
+    it('increments count and re-renders', function() {
+        var view = new Whisper.ScrollDownButtonView();
+        view.render();
+        assert.equal(view.count, 0);
+        assert.notMatch(view.$el.html(), /new-messages/);
+        view.increment(1);
+        assert.equal(view.count, 1);
+        assert.match(view.$el.html(), /new-messages/);
+    });
+});