1 files changed, 45 insertions, 0 deletions
diff --git a/devtools/client/shared/test/browser_prefs-02.js b/devtools/client/shared/test/browser_prefs-02.js
new file mode 100644
index 000000000..f0f638d63
--- /dev/null
+++ b/devtools/client/shared/test/browser_prefs-02.js
@@ -0,0 +1,45 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that preference helpers work properly with custom types of Float and Json.
+
+const { PrefsHelper } = require("devtools/client/shared/prefs");
+
+function test() {
+  let originalJson = Services.prefs.getCharPref(
+    "devtools.performance.timeline.hidden-markers");
+  let originalFloat = Services.prefs.getCharPref(
+    "devtools.performance.memory.sample-probability");
+
+  let Prefs = new PrefsHelper("devtools.performance", {
+    "float": ["Float", "memory.sample-probability"],
+    "json": ["Json", "timeline.hidden-markers"]
+  });
+
+  Prefs.registerObserver();
+
+  // Float
+  Services.prefs.setCharPref("devtools.performance.timeline.hidden-markers", "{\"a\":1}");
+  is(Prefs.json.a, 1, "The JSON pref value is correctly casted on get.");
+
+  Prefs.json = { b: 2 };
+  is(Prefs.json.a, undefined, "The JSON pref value is correctly casted on set (1).");
+  is(Prefs.json.b, 2, "The JSON pref value is correctly casted on set (2).");
+
+  // Float
+  Services.prefs.setCharPref("devtools.performance.memory.sample-probability", "3.14");
+  is(Prefs.float, 3.14, "The float pref value is correctly casted on get.");
+
+  Prefs.float = 6.28;
+  is(Prefs.float, 6.28, "The float pref value is correctly casted on set.");
+
+  Prefs.unregisterObserver();
+
+  Services.prefs.setCharPref("devtools.performance.timeline.hidden-markers",
+                             originalJson);
+  Services.prefs.setCharPref("devtools.performance.memory.sample-probability",
+                             originalFloat);
+  finish();
+}