diff -r 000000000000 -r 6474c204b198 browser/devtools/debugger/test/browser_dbg_auto-pretty-print-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/debugger/test/browser_dbg_auto-pretty-print-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,114 @@
+/* Any copyright is dedicated to the Public Domain.
+  http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Test that auto pretty printing doesn't accidentally toggle
+ * pretty printing off when we switch to a minified source
+ * that is already pretty printed.
+ */
+
+const TAB_URL = EXAMPLE_URL + "doc_auto-pretty-print-02.html";
+
+let gTab, gDebuggee, gPanel, gDebugger;
+let gEditor, gSources, gPrefs, gOptions, gView;
+
+let gFirstSourceLabel = "code_ugly-6.js";
+let gSecondSourceLabel = "code_ugly-7.js";
+
+let gOriginalPref = Services.prefs.getBoolPref("devtools.debugger.auto-pretty-print");
+Services.prefs.setBoolPref("devtools.debugger.auto-pretty-print", true);
+
+function test(){
+  initDebugger(TAB_URL).then(([aTab, aDebuggee, aPanel]) => {
+    gTab = aTab;
+    gDebuggee = aDebuggee;
+    gPanel = aPanel;
+    gDebugger = gPanel.panelWin;
+    gEditor = gDebugger.DebuggerView.editor;
+    gSources = gDebugger.DebuggerView.Sources;
+    gPrefs = gDebugger.Prefs;
+    gOptions = gDebugger.DebuggerView.Options;
+    gView = gDebugger.DebuggerView;
+
+    // Should be on by default.
+    testAutoPrettyPrintOn();
+
+    waitForSourceShown(gPanel, gFirstSourceLabel)
+      .then(testSourceIsUgly)
+      .then(() => waitForSourceShown(gPanel, gFirstSourceLabel))
+      .then(testSourceIsPretty)
+      .then(testPrettyPrintButtonOn)
+      .then(() => {
+        // Switch to the second source.
+        let finished = waitForDebuggerEvents(gPanel, gDebugger.EVENTS.SOURCE_SHOWN);
+        gSources.selectedIndex = 1;
+        return finished;
+      })
+      .then(testSecondSourceLabel)
+      .then(() => {
+        // Switch back to first source.
+        let finished = waitForDebuggerEvents(gPanel, gDebugger.EVENTS.SOURCE_SHOWN);
+        gSources.selectedIndex = 0;
+        return finished;
+      })
+      .then(testFirstSourceLabel)
+      .then(testPrettyPrintButtonOn)
+      // Disable auto pretty printing so it does not affect the following tests.
+      .then(disableAutoPrettyPrint)
+      .then(() => closeDebuggerAndFinish(gPanel))
+      .then(null, aError => {
+        ok(false, "Got an error: " + DevToolsUtils.safeErrorString(aError));
+      })
+  });
+}
+
+function testSourceIsUgly() {
+  ok(!gEditor.getText().contains("\n  "),
+    "The source shouldn't be pretty printed yet.");
+}
+
+function testFirstSourceLabel(){
+  ok(gSources.containsValue(EXAMPLE_URL + gFirstSourceLabel),
+    "First source url is correct.");
+}
+
+function testSecondSourceLabel(){
+  ok(gSources.containsValue(EXAMPLE_URL + gSecondSourceLabel),
+    "Second source url is correct.");
+}
+
+function testAutoPrettyPrintOn(){
+  is(gPrefs.autoPrettyPrint, true,
+    "The auto-pretty-print pref should be on.");
+  is(gOptions._autoPrettyPrint.getAttribute("checked"), "true",
+    "The Auto pretty print menu item should be checked.");
+}
+
+function testPrettyPrintButtonOn(){
+  is(gDebugger.document.getElementById("pretty-print").checked, true,
+    "The button should be checked when the source is selected.");
+}
+
+function disableAutoPrettyPrint(){
+  gOptions._autoPrettyPrint.setAttribute("checked", "false");
+  gOptions._toggleAutoPrettyPrint();
+  gOptions._onPopupHidden();
+}
+
+function testSourceIsPretty() {
+  ok(gEditor.getText().contains("\n  "),
+    "The source should be pretty printed.")
+}
+
+registerCleanupFunction(function() {
+  gTab = null;
+  gDebuggee = null;
+  gPanel = null;
+  gDebugger = null;
+  gEditor = null;
+  gSources = null;
+  gOptions = null;
+  gPrefs = null;
+  gView = null;
+  Services.prefs.setBoolPref("devtools.debugger.auto-pretty-print", gOriginalPref);
+});