diff --git a/spec/justRebase.spec.js b/spec/justRebase.spec.js
new file mode 100644
index 00000000..14cf242a
--- /dev/null
+++ b/spec/justRebase.spec.js
@@ -0,0 +1,52 @@
+var HeadlessGit = require('../src/js/git/headless').HeadlessGit;
+var TreeCompare = require('../src/js/git/treeCompare').TreeCompare;
+
+var loadTree = function(json) {
+  return JSON.parse(unescape(json));
+};
+
+var compareAnswer = function(headless, expectedJSON) {
+  var expectedTree = loadTree(expectedJSON);
+  var actualTree = headless.gitEngine.exportTree();
+
+  return TreeCompare.compareTrees(expectedTree, actualTree);
+};
+
+var compareAnswerExpect = function(headless, expectedJSON) {
+  var equal = compareAnswer(headless, expectedJSON);
+  if (!equal) {
+    var expectedTree = loadTree(expectedJSON);
+    var actualTree = headless.gitEngine.exportTree();
+    console.log('expected Tree', expectedTree);
+    console.log('actual Tree', actualTree);
+    console.log('~~~~~~~~~~~~~~~~~~~~~');
+  }
+  expect(equal).toBe(true);
+};
+
+var expectTree = function(command, expectedJSON) {
+  var headless = new HeadlessGit();
+  headless.sendCommand(command);
+  compareAnswerExpect(headless, expectedJSON);
+};
+
+var expectTreeAsync = function(command, expectedJSON) {
+  var headless = new HeadlessGit();
+  runs(function() {
+    headless.sendCommand(command);
+  });
+  waitsFor(function() {
+    return compareAnswer(headless, expectedJSON);
+  }, 'trees should be equal', 750);
+};
+
+describe('GitEngine', function() {
+  it('Rebases', function() {
+    expectTreeAsync(
+      'gc; git checkout -b side C1; gc; git rebase master',
+      '%7B%22branches%22%3A%7B%22master%22%3A%7B%22target%22%3A%22C2%22%2C%22id%22%3A%22master%22%7D%2C%22side%22%3A%7B%22target%22%3A%22C3%27%22%2C%22id%22%3A%22side%22%7D%7D%2C%22commits%22%3A%7B%22C0%22%3A%7B%22parents%22%3A%5B%5D%2C%22id%22%3A%22C0%22%2C%22rootCommit%22%3Atrue%7D%2C%22C1%22%3A%7B%22parents%22%3A%5B%22C0%22%5D%2C%22id%22%3A%22C1%22%7D%2C%22C2%22%3A%7B%22parents%22%3A%5B%22C1%22%5D%2C%22id%22%3A%22C2%22%7D%2C%22C3%22%3A%7B%22parents%22%3A%5B%22C1%22%5D%2C%22id%22%3A%22C3%22%7D%2C%22C3%27%22%3A%7B%22parents%22%3A%5B%22C2%22%5D%2C%22id%22%3A%22C3%27%22%7D%7D%2C%22HEAD%22%3A%7B%22target%22%3A%22side%22%2C%22id%22%3A%22HEAD%22%7D%7D'
+    );
+  });
+
+});
+