Bug 1338306 - nsIPrefBranch.get*Pref should support providing a default value, r=bsmedberg.

1 files changed, 48 insertions, 0 deletions

diff --git a/modules/libpref/test/unit/test_defaultValues.js b/modules/libpref/test/unit/test_defaultValues.js
new file mode 100644
index 000000000..d04bcc04a
--- /dev/null
+++ b/modules/libpref/test/unit/test_defaultValues.js
@@ -0,0 +1,48 @@
+/* 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 providing a default value to get{Bool,Char,Float,Int}Pref */
+
+function run_test() {
+  var ps = Cc["@mozilla.org/preferences-service;1"]
+             .getService(Ci.nsIPrefService)
+             .QueryInterface(Ci.nsIPrefBranch);
+
+  let prefName = "test.default.values.bool";
+  do_check_throws(function() { ps.getBoolPref(prefName); },
+                  Cr.NS_ERROR_UNEXPECTED);
+  strictEqual(ps.getBoolPref(prefName, false), false);
+  strictEqual(ps.getBoolPref(prefName, true), true);
+  ps.setBoolPref(prefName, true);
+  strictEqual(ps.getBoolPref(prefName), true);
+  strictEqual(ps.getBoolPref(prefName, false), true);
+  strictEqual(ps.getBoolPref(prefName, true), true);
+
+  prefName = "test.default.values.char";
+  do_check_throws(function() { ps.getCharPref(prefName); },
+                  Cr.NS_ERROR_UNEXPECTED);
+  strictEqual(ps.getCharPref(prefName, ""), "");
+  strictEqual(ps.getCharPref(prefName, "string"), "string");
+  ps.setCharPref(prefName, "foo");
+  strictEqual(ps.getCharPref(prefName), "foo");
+  strictEqual(ps.getCharPref(prefName, "string"), "foo");
+
+  prefName = "test.default.values.float";
+  do_check_throws(function() { ps.getFloatPref(prefName); },
+                  Cr.NS_ERROR_UNEXPECTED);
+  strictEqual(ps.getFloatPref(prefName, 3.5), 3.5);
+  strictEqual(ps.getFloatPref(prefName, 0), 0);
+  ps.setCharPref(prefName, 1.75);
+  strictEqual(ps.getFloatPref(prefName), 1.75);
+  strictEqual(ps.getFloatPref(prefName, 3.5), 1.75);
+
+  prefName = "test.default.values.int";
+  do_check_throws(function() { ps.getIntPref(prefName); },
+                  Cr.NS_ERROR_UNEXPECTED);
+  strictEqual(ps.getIntPref(prefName, 3), 3);
+  strictEqual(ps.getIntPref(prefName, 0), 0);
+  ps.setIntPref(prefName, 42);
+  strictEqual(ps.getIntPref(prefName), 42);
+  strictEqual(ps.getIntPref(prefName, 3), 42);
+}