diff --git a/‎lib/commit.js‎
Lines changed: 1 addition & 1 deletion b/‎lib/commit.js‎
Lines changed: 1 addition & 1 deletion
diff --git a/‎test/tests/diff.js‎
Lines changed: 5 additions & 5 deletions b/‎test/tests/diff.js‎
Lines changed: 5 additions & 5 deletions
@@ -173,7 +173,7 @@ Commit.prototype.getDiff = function(callback) {
     var diffs = parents.map(function(parent) {
       return parent.getTree().then(function(parentTree) {
         return commit.getTree().then(function(thisTree) {
-          return parentTree.diff(thisTree);
+          return thisTree.diff(parentTree);
         });
       });
     });
 
@@ -59,18 +59,18 @@ describe("Diff", function() {
     assert.equal(lines[1].origin(), Diff.LINE.CONTEXT);
     assert.equal(lines[2].origin(), Diff.LINE.CONTEXT);
 
-    var oldContent = "\n__Before submitting a pull request, please ensure " +
+    var oldContent = "__Before submitting a pull request, please ensure " +
       "both unit tests and lint checks pass.__\n";
-    assert.equal(lines[2].content(), oldContent);
+    assert.equal(lines[3].content(), oldContent);
     assert.equal(lines[3].origin(), Diff.LINE.DELETION);
-    assert.equal(lines[4].contentLen(), 90);
+    assert.equal(lines[3].contentLen(), 90);
 
     var newContent = "__Before submitting a pull request, please ensure " +
       "both that you've added unit tests to cover your shiny new code, " +
       "and that all unit tests and lint checks pass.__\n";
-    assert.equal(lines[3].content(), newContent);
+    assert.equal(lines[4].content(), newContent);
     assert.equal(lines[4].origin(), Diff.LINE.ADDITION);
-    assert.equal(lines[3].contentLen(), 162);
+    assert.equal(lines[4].contentLen(), 162);
   });
 
   it("can diff the workdir with index", function() {