1 files changed, 164 insertions, 0 deletions
diff --git a/modules/libpref/test/unit/test_changeType.js b/modules/libpref/test/unit/test_changeType.js
new file mode 100644
index 0000000000..94f3a84f13
--- /dev/null
+++ b/modules/libpref/test/unit/test_changeType.js
@@ -0,0 +1,164 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* Tests for changing the type of a preference (bug 985998) */
+
+function run_test() {
+  var ps = Services.prefs;
+
+  let defaultBranch = ps.getDefaultBranch("");
+  let userBranch = ps.getBranch("");
+
+  // Prefs that only have a default value -- we can't change their type.
+  defaultBranch.setBoolPref("TypeTest.default.bool", true);
+  defaultBranch.setIntPref("TypeTest.default.int", 23);
+  defaultBranch.setCharPref("TypeTest.default.char", "hey");
+
+  Assert.equal(userBranch.getBoolPref("TypeTest.default.bool"), true);
+  Assert.equal(userBranch.getIntPref("TypeTest.default.int"), 23);
+  Assert.equal(userBranch.getCharPref("TypeTest.default.char"), "hey");
+
+  // Prefs that only have a user value -- we can change their type, but only
+  // when we set the user value.
+  userBranch.setBoolPref("TypeTest.user.bool", false);
+  userBranch.setIntPref("TypeTest.user.int", 24);
+  userBranch.setCharPref("TypeTest.user.char", "hi");
+
+  Assert.equal(userBranch.getBoolPref("TypeTest.user.bool"), false);
+  Assert.equal(userBranch.getIntPref("TypeTest.user.int"), 24);
+  Assert.equal(userBranch.getCharPref("TypeTest.user.char"), "hi");
+
+  // Prefs that have both a default and a user value -- we can't change their
+  // type.
+  defaultBranch.setBoolPref("TypeTest.both.bool", true);
+  userBranch.setBoolPref("TypeTest.both.bool", false);
+  defaultBranch.setIntPref("TypeTest.both.int", 25);
+  userBranch.setIntPref("TypeTest.both.int", 26);
+  defaultBranch.setCharPref("TypeTest.both.char", "yo");
+  userBranch.setCharPref("TypeTest.both.char", "ya");
+
+  Assert.equal(userBranch.getBoolPref("TypeTest.both.bool"), false);
+  Assert.equal(userBranch.getIntPref("TypeTest.both.int"), 26);
+  Assert.equal(userBranch.getCharPref("TypeTest.both.char"), "ya");
+
+  // We only have a default value, and we try to set a default value of a
+  // different type --> fails.
+  do_check_throws(function () {
+    defaultBranch.setCharPref("TypeTest.default.bool", "boo");
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setIntPref("TypeTest.default.bool", 5);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setCharPref("TypeTest.default.int", "boo");
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setBoolPref("TypeTest.default.int", true);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setBoolPref("TypeTest.default.char", true);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setIntPref("TypeTest.default.char", 6);
+  }, Cr.NS_ERROR_UNEXPECTED);
+
+  // We only have a default value, and we try to set a user value of a
+  // different type --> fails.
+  do_check_throws(function () {
+    userBranch.setCharPref("TypeTest.default.bool", "boo");
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    userBranch.setIntPref("TypeTest.default.bool", 5);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    userBranch.setCharPref("TypeTest.default.int", "boo");
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    userBranch.setBoolPref("TypeTest.default.int", true);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    userBranch.setBoolPref("TypeTest.default.char", true);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    userBranch.setIntPref("TypeTest.default.char", 6);
+  }, Cr.NS_ERROR_UNEXPECTED);
+
+  // We only have a user value, and we try to set a default value of a
+  // different type --> fails.
+  do_check_throws(function () {
+    defaultBranch.setCharPref("TypeTest.user.bool", "boo");
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setIntPref("TypeTest.user.bool", 5);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setCharPref("TypeTest.user.int", "boo");
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setBoolPref("TypeTest.user.int", true);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setBoolPref("TypeTest.user.char", true);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setIntPref("TypeTest.user.char", 6);
+  }, Cr.NS_ERROR_UNEXPECTED);
+
+  // We only have a user value, and we try to set a user value of a
+  // different type --> SUCCEEDS.
+  userBranch.setCharPref("TypeTest.user.bool", "boo");
+  Assert.equal(userBranch.getCharPref("TypeTest.user.bool"), "boo");
+  userBranch.setIntPref("TypeTest.user.bool", 5);
+  Assert.equal(userBranch.getIntPref("TypeTest.user.bool"), 5);
+  userBranch.setCharPref("TypeTest.user.int", "boo");
+  Assert.equal(userBranch.getCharPref("TypeTest.user.int"), "boo");
+  userBranch.setBoolPref("TypeTest.user.int", true);
+  Assert.equal(userBranch.getBoolPref("TypeTest.user.int"), true);
+  userBranch.setBoolPref("TypeTest.user.char", true);
+  Assert.equal(userBranch.getBoolPref("TypeTest.user.char"), true);
+  userBranch.setIntPref("TypeTest.user.char", 6);
+  Assert.equal(userBranch.getIntPref("TypeTest.user.char"), 6);
+
+  // We have both a default value and user value, and we try to set a default
+  // value of a different type --> fails.
+  do_check_throws(function () {
+    defaultBranch.setCharPref("TypeTest.both.bool", "boo");
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setIntPref("TypeTest.both.bool", 5);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setCharPref("TypeTest.both.int", "boo");
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setBoolPref("TypeTest.both.int", true);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setBoolPref("TypeTest.both.char", true);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    defaultBranch.setIntPref("TypeTest.both.char", 6);
+  }, Cr.NS_ERROR_UNEXPECTED);
+
+  // We have both a default value and user value, and we try to set a user
+  // value of a different type --> fails.
+  do_check_throws(function () {
+    userBranch.setCharPref("TypeTest.both.bool", "boo");
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    userBranch.setIntPref("TypeTest.both.bool", 5);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    userBranch.setCharPref("TypeTest.both.int", "boo");
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    userBranch.setBoolPref("TypeTest.both.int", true);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    userBranch.setBoolPref("TypeTest.both.char", true);
+  }, Cr.NS_ERROR_UNEXPECTED);
+  do_check_throws(function () {
+    userBranch.setIntPref("TypeTest.both.char", 6);
+  }, Cr.NS_ERROR_UNEXPECTED);
+}