diff -r 000000000000 -r 6474c204b198 browser/devtools/scratchpad/test/browser_scratchpad_open.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/scratchpad/test/browser_scratchpad_open.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,76 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// only finish() when correct number of tests are done
+const expected = 3;
+var count = 0;
+var lastUniqueName = null;
+
+function done()
+{
+  if (++count == expected) {
+    finish();
+  }
+}
+
+function test()
+{
+  waitForExplicitFinish();
+  testOpen();
+  testOpenWithState();
+  testOpenInvalidState();
+}
+
+function testUniqueName(name)
+{
+  ok(name, "Scratchpad has a uniqueName");
+
+  if (lastUniqueName === null) {
+    lastUniqueName = name;
+    return;
+  }
+
+  ok(name !== lastUniqueName,
+      "Unique name for this instance differs from the last one.");
+}
+
+function testOpen()
+{
+  openScratchpad(function(win) {
+    is(win.Scratchpad.filename, undefined, "Default filename is undefined");
+    isnot(win.Scratchpad.getText(), null, "Default text should not be null");
+    is(win.Scratchpad.executionContext, win.SCRATCHPAD_CONTEXT_CONTENT,
+      "Default execution context is content");
+    testUniqueName(win.Scratchpad.uniqueName);
+
+    win.close();
+    done();
+  }, {noFocus: true});
+}
+
+function testOpenWithState()
+{
+  let state = {
+    filename: "testfile",
+    executionContext: 2,
+    text: "test text"
+  };
+
+  openScratchpad(function(win) {
+    is(win.Scratchpad.filename, state.filename, "Filename loaded from state");
+    is(win.Scratchpad.executionContext, state.executionContext, "Execution context loaded from state");
+    is(win.Scratchpad.getText(), state.text, "Content loaded from state");
+    testUniqueName(win.Scratchpad.uniqueName);
+
+    win.close();
+    done();
+  }, {state: state, noFocus: true});
+}
+
+function testOpenInvalidState()
+{
+  let win = openScratchpad(null, {state: 7});
+  ok(!win, "no scratchpad opened if state is not an object");
+  done();
+}