Add tests for OpenSeadragon.getViewer

test/modules/viewerretrieval.js

@@ -0,0 +1,93 @@
+/* global QUnit, $, testLog */
+
+(function() {
+    var viewer1;
+    var viewer2;
+
+    QUnit.module('ViewerRetrieval', {
+        beforeEach: function () {
+            $('<div id="example1"></div><div id="example2"></div>')
+                .appendTo("#qunit-fixture");
+
+            testLog.reset();
+
+            viewer1 = OpenSeadragon({
+                id: 'example1',
+                prefixUrl: 'build/openseadragon/images/',
+                springStiffness: 100 // Faster animation = faster tests
+            });
+
+            viewer2 = OpenSeadragon({
+                id: 'example2',
+                prefixUrl: 'build/openseadragon/images/',
+                springStiffness: 100
+            });
+        },
+
+        afterEach: function () {
+            if (viewer1 && viewer1.destroy) {
+                viewer1.destroy();
+            }
+            if (viewer2 && viewer2.destroy) {
+                viewer2.destroy();
+            }
+            viewer1 = viewer2 = null;
+        }
+    });
+
+    QUnit.test('Get Viewers by Id', function(assert) {
+        var retrievedViewer1 = OpenSeadragon.getViewer('example1');
+        assert.ok(retrievedViewer1, 'Attached viewer retrieved');
+        assert.equal(retrievedViewer1, viewer1, 'Viewers are same instance');
+
+        var retrievedViewer2 = OpenSeadragon.getViewer('example2');
+        assert.ok(retrievedViewer2, 'Attached viewer retrieved');
+        assert.equal(retrievedViewer2, viewer2, 'Viewers are same instance');
+
+        // Internal state
+        assert.equal(OpenSeadragon._viewers.size, 2, 'Correct amount of viewers');
+    });
+
+    QUnit.test('Get Viewers by Element', function(assert) {
+        var retrievedViewer1 = OpenSeadragon.getViewer(
+            document.getElementById('example1'));
+        assert.ok(retrievedViewer1, 'Attached viewer retrieved');
+        assert.equal(retrievedViewer1, viewer1, 'Viewers are same instance');
+
+        var retrievedViewer2 = OpenSeadragon.getViewer(
+            document.getElementById('example2'));
+        assert.ok(retrievedViewer2, 'Attached viewer retrieved');
+        assert.equal(retrievedViewer2, viewer2, 'Viewers are same instance');
+
+        // Internal state
+        assert.equal(OpenSeadragon._viewers.size, 2, 'Correct amount of viewers');
+    });
+
+    QUnit.test('Undefined on Get Non-Existent Viewer by Id', function(assert) {
+        var notFoundViewer = OpenSeadragon.getViewer('no-viewer');
+        assert.equal(notFoundViewer, undefined, "Not found viewer is undefined");
+    });
+
+    QUnit.test('Undefined on Get Non-Existent Viewer by Element', function(assert) {
+        var element = document.createElement('div');
+        element.id = 'no-viewer';
+        document.body.appendChild(element);
+
+        var notFoundViewer = OpenSeadragon.getViewer(element);
+        assert.equal(notFoundViewer, undefined, "Not found viewer is undefined");
+    });
+
+    QUnit.test('Cleanup Viewers Registration', function(assert) {
+        viewer1.destroy();
+        viewer2.destroy();
+        viewer1 = viewer2 = null;
+
+        var retrievedViewer1 = OpenSeadragon.getViewer('example1');
+        var retrievedViewer2 = OpenSeadragon.getViewer('example2');
+        assert.equal(retrievedViewer1, undefined, 'Viewer was destroyed');
+        assert.equal(retrievedViewer2, undefined, 'Viewer was destroyed');
+
+        // Internal state
+        assert.equal(OpenSeadragon._viewers.size, 0, 'No viewers are registered');
+    });
+})();

test/test.html

@@ -22,6 +22,7 @@
     <!-- Polyfill must be inserted first because it is testing functions
          reassignments which could be done by other test. -->
     <script src="/test/modules/polyfills.js"></script>
+    <script src="/test/modules/viewerretrieval.js"></script>
     <script src="/test/modules/basic.js"></script>
     <script src="/test/modules/strings.js"></script>
     <script src="/test/modules/formats.js"></script>