Add tests for shouldShowThread()

h/static/scripts/test/widget-controller-test.coffee

@@ -86,3 +86,34 @@ describe 'WidgetController', ->
       assert.calledWith(loadSpy, [40..59])
       assert.calledWith(loadSpy, [60..79])
       assert.calledWith(loadSpy, [80..99])
+
+  describe 'shouldShowThread()', ->
+    it 'returns false for orphan annotations', ->
+      # Turn the 'show_unanchored_annotations' feature off.
+      $scope.feature = -> false
+
+      container =
+        message:
+          $orphan: true
+
+      assert($scope.shouldShowThread(container) is false)
+
+    it 'returns true for non-orphan annotations', ->
+      # Turn the 'show_unanchored_annotations' feature off.
+      $scope.feature = -> false
+
+      container =
+        message:
+          $orphan: false
+
+      assert($scope.shouldShowThread(container) is true)
+
+    it 'returns true for orphan annotations if show_unanchored_annotations is on', ->
+      # Turn the 'show_unanchored_annotations' feature on.
+      $scope.feature = -> true
+
+      container =
+        message:
+          $orphan: true
+
+      assert($scope.shouldShowThread(container) is true)