diff -r 000000000000 -r 6474c204b198 browser/base/content/test/newtab/browser_newtab_unpin.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/newtab/browser_newtab_unpin.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,56 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/*
+ * These tests make sure that when a site gets unpinned it is either moved to
+ * its actual place in the grid or removed in case it's not on the grid anymore.
+ */
+function runTests() {
+  // we have a pinned link that didn't change its position since it was pinned.
+  // nothing should happend when we unpin it.
+  yield setLinks("0,1,2,3,4,5,6,7,8");
+  setPinnedLinks(",1");
+
+  yield addNewTabPageTab();
+  checkGrid("0,1p,2,3,4,5,6,7,8");
+
+  yield unpinCell(1);
+  checkGrid("0,1,2,3,4,5,6,7,8");
+
+  // we have a pinned link that is not anymore in the list of the most-visited
+  // links. this should disappear, the remaining links adjust their positions
+  // and a new link will appear at the end of the grid.
+  yield setLinks("0,1,2,3,4,5,6,7,8");
+  setPinnedLinks(",99");
+
+  yield addNewTabPageTab();
+  checkGrid("0,99p,1,2,3,4,5,6,7");
+
+  yield unpinCell(1);
+  checkGrid("0,1,2,3,4,5,6,7,8");
+
+  // we have a pinned link that changed its position since it was pinned. it
+  // should be moved to its new position after being unpinned.
+  yield setLinks("0,1,2,3,4,5,6,7");
+  setPinnedLinks(",1,,,,,,,0");
+
+  yield addNewTabPageTab();
+  checkGrid("2,1p,3,4,5,6,7,,0p");
+
+  yield unpinCell(1);
+  checkGrid("1,2,3,4,5,6,7,,0p");
+
+  yield unpinCell(8);
+  checkGrid("0,1,2,3,4,5,6,7,");
+
+  // we have pinned link that changed its position since it was pinned. the
+  // link will disappear from the grid because it's now a much lower priority
+  yield setLinks("0,1,2,3,4,5,6,7,8,9");
+  setPinnedLinks("9");
+
+  yield addNewTabPageTab();
+  checkGrid("9p,0,1,2,3,4,5,6,7");
+
+  yield unpinCell(0);
+  checkGrid("0,1,2,3,4,5,6,7,8");
+}