Add line widget tests (for #2460)

Author: Adam Ahmed

test/index.html

@@ -96,6 +96,7 @@ <h2>Test Suite</h2>
     <script src="../mode/xquery/test.js"></script>
     <script src="../addon/mode/multiplex_test.js"></script>
     <script src="vim_test.js"></script>
+    <script src="widget_test.js"></script>
     <script src="emacs_test.js"></script>
     <script>
       window.onload = runHarness;

test/widget_test.js

@@ -0,0 +1,53 @@
+(function() {
+  "use strict";
+
+  namespace = "widget_";
+
+  function makeLineWidget(cm, line, height, options) {
+    var widgetEl = document.createElement('div');
+    widgetEl.style.height = height + 'px';
+    widgetEl.textContent = 'dummy text';
+
+    return {
+      el : widgetEl,
+      widget : cm.addLineWidget(line, widgetEl, options || {})
+    };
+  }
+
+  function testWidgetsAffectDocumentHeight(tagline, docLines, widgetLine, viewportLine) {
+    var initialHeight = 100;
+    var changedHeight = 150;
+
+    testCM('lineWidgetDocHeight_' + tagline, function(cm) {
+      var startingDocHeight = cm.getScrollInfo().height;
+
+      if (viewportLine != null) {
+	cm.scrollIntoView({ line : viewportLine, ch: 0 });
+      }
+
+      var widgetInfo = makeLineWidget(cm, widgetLine, initialHeight);
+      eq(startingDocHeight + initialHeight, cm.getScrollInfo().height, 'addLineWidget(): widget height should be added to document height.');
+
+      widgetInfo.el.style.height = changedHeight + 'px';
+      widgetInfo.widget.changed();
+      eq(startingDocHeight + changedHeight, cm.getScrollInfo().height, 'widget.changed(): widget height should be updated in document height.');
+
+      widgetInfo.widget.clear();
+      eq(startingDocHeight, cm.getScrollInfo().height, 'widget.clear(): widget height should be removed from document height.');
+    }, {
+      value : new Array(docLines + 1).join('blah\n')
+    })
+  }
+
+  testWidgetsAffectDocumentHeight('shortFile_WidgetAtTop', 50, 0);
+  testWidgetsAffectDocumentHeight('shortFile_WidgetAtBottom', 50, 49);
+
+  testWidgetsAffectDocumentHeight('longFile_WidgetAtTop', 1000, 1);
+  testWidgetsAffectDocumentHeight('longFile_WidgetAtMiddle', 1000, 500);
+  testWidgetsAffectDocumentHeight('longFile_WidgetAtBottom', 1000, 1000);
+
+  testWidgetsAffectDocumentHeight('longFile_WidgetAtTop_viewportBottom', 1000, 0, 999);
+  testWidgetsAffectDocumentHeight('longFile_WidgetAtMiddle_viewportBottom', 1000, 499, 999);
+  testWidgetsAffectDocumentHeight('longFile_WidgetAtBottom_viewportBottom', 1000, 999, 999);
+
+})();