Bug 1615450 - Add `Services.appinfo` to JEXL filter context r=leplatrem

Differential Revision: https://phabricator.services.mozilla.com/D62839

--HG--
extra : moz-landing-system : lando

toolkit/components/utils/ClientEnvironment.jsm

@@ -259,4 +259,8 @@ class ClientEnvironmentBase {
   static get attribution() {
     return AttributionCode.getAttrDataAsync();
   }
+
+  static get appinfo() {
+    return Services.appinfo;
+  }
 }

toolkit/components/utils/test/browser/browser.ini

@@ -1 +1,2 @@
+[browser_ClientEnvironment.js]
 [browser_JsonSchemaValidator.js]

toolkit/components/utils/test/browser/browser_ClientEnvironment.js

@@ -0,0 +1,28 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/*
+ * This can't be an xpcshell-test because, according to
+ * `toolkit/modules/Services.jsm`, "Not all applications implement
+ * nsIXULAppInfo (e.g. xpcshell doesn't)."
+ */
+const { ClientEnvironmentBase } = ChromeUtils.import(
+  "resource://gre/modules/components-utils/ClientEnvironment.jsm"
+);
+
+add_task(function testBuildId() {
+  ok(
+    ClientEnvironmentBase.appinfo !== undefined,
+    "appinfo should be available in the context"
+  );
+  ok(
+    typeof ClientEnvironmentBase.appinfo === "object",
+    "appinfo should be an object"
+  );
+  ok(
+    typeof ClientEnvironmentBase.appinfo.appBuildID === "string",
+    "buildId should be a string"
+  );
+});