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node_modules/mark.js/test/specs/iframes/order.js

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+'use strict';
+describe('mark with iframes DOM order', function() {
+  var $ctx, elements;
+  beforeEach(function(done) {
+    loadFixtures('iframes/order.html');
+
+    $ctx = $('.iframes-order');
+    elements = [];
+    new Mark($ctx[0]).mark('lorem', {
+      'diacritics': false,
+      'separateWordSearch': false,
+      'iframes': true,
+      'each': function(node) {
+        elements.push(node);
+      },
+      'done': done
+    });
+  });
+
+  it('should wrap elements in the DOM order', function() {
+    expect(elements.length).toBe(6);
+    elements.forEach(function(node, i){
+      var thisDoc = $(node).prop('ownerDocument'),
+        ownerDoc = $ctx.prop('ownerDocument'),
+        equalDocs = thisDoc === ownerDoc;
+      if ((i + 1) === 1 || (i + 1) === 6){ // first and last element
+        expect(equalDocs).toBe(true);
+      } else { // other elements should be in an iframe
+        expect(equalDocs).toBe(false);
+      }
+    });
+  });
+});