diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/browser_dbg_reload-same-script.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/browser_dbg_reload-same-script.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,78 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Tests if the same source is shown after a page is reloaded.
+ */
+
+const TAB_URL = EXAMPLE_URL + "doc_script-switching-01.html";
+const FIRST_URL = EXAMPLE_URL + "code_script-switching-01.js";
+const SECOND_URL = EXAMPLE_URL + "code_script-switching-02.js";
+
+function test() {
+  // Debug test slaves are a bit slow at this test.
+  requestLongerTimeout(2);
+
+  let gTab, gDebuggee, gPanel, gDebugger;
+  let gSources, gStep;
+
+  initDebugger(TAB_URL).then(([aTab, aDebuggee, aPanel]) => {
+    gTab = aTab;
+    gDebuggee = aDebuggee;
+    gPanel = aPanel;
+    gDebugger = aPanel.panelWin;
+    gSources = gDebugger.DebuggerView.Sources;
+    gStep = 0;
+
+    waitForSourceShown(gPanel, FIRST_URL).then(performTest);
+  });
+
+  function performTest() {
+    switch (gStep++) {
+      case 0:
+        testCurrentSource(FIRST_URL, "");
+        reload().then(performTest);
+        break;
+      case 1:
+        testCurrentSource(FIRST_URL);
+        reload().then(performTest);
+        break;
+      case 2:
+        testCurrentSource(FIRST_URL);
+        switchAndReload(SECOND_URL).then(performTest);
+        break;
+      case 3:
+        testCurrentSource(SECOND_URL);
+        reload().then(performTest);
+        break;
+      case 4:
+        testCurrentSource(SECOND_URL);
+        reload().then(performTest);
+        break;
+      case 5:
+        testCurrentSource(SECOND_URL);
+        closeDebuggerAndFinish(gPanel);
+        break;
+    }
+  }
+
+  function reload() {
+    return reloadActiveTab(gPanel, gDebugger.EVENTS.SOURCES_ADDED);
+  }
+
+  function switchAndReload(aUrl) {
+    let finished = waitForDebuggerEvents(gPanel, gDebugger.EVENTS.SOURCE_SHOWN).then(reload);
+    gSources.selectedValue = aUrl;
+    return finished;
+  }
+
+  function testCurrentSource(aUrl, aExpectedUrl = aUrl) {
+    info("Currently preferred source: '" + gSources.preferredValue + "'.");
+    info("Currently selected source: '" + gSources.selectedValue + "'.");
+
+    is(gSources.preferredValue, aExpectedUrl,
+      "The preferred source url wasn't set correctly (" + gStep + ").");
+    is(gSources.selectedValue, aUrl,
+      "The selected source isn't the correct one (" + gStep + ").");
+  }
+}