1 files changed, 95 insertions, 0 deletions
diff --git a/services/sync/tests/unit/test_utils_json.js b/services/sync/tests/unit/test_utils_json.js
new file mode 100644
index 0000000000..5bf26b2361
--- /dev/null
+++ b/services/sync/tests/unit/test_utils_json.js
@@ -0,0 +1,95 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const { FileUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/FileUtils.sys.mjs"
+);
+
+add_task(async function test_roundtrip() {
+  _("Do a simple write of an array to json and read");
+  await Utils.jsonSave("foo", {}, ["v1", "v2"]);
+
+  let foo = await Utils.jsonLoad("foo", {});
+  Assert.equal(typeof foo, "object");
+  Assert.equal(foo.length, 2);
+  Assert.equal(foo[0], "v1");
+  Assert.equal(foo[1], "v2");
+});
+
+add_task(async function test_string() {
+  _("Try saving simple strings");
+  await Utils.jsonSave("str", {}, "hi");
+
+  let str = await Utils.jsonLoad("str", {});
+  Assert.equal(typeof str, "string");
+  Assert.equal(str.length, 2);
+  Assert.equal(str[0], "h");
+  Assert.equal(str[1], "i");
+});
+
+add_task(async function test_number() {
+  _("Try saving a number");
+  await Utils.jsonSave("num", {}, 42);
+
+  let num = await Utils.jsonLoad("num", {});
+  Assert.equal(typeof num, "number");
+  Assert.equal(num, 42);
+});
+
+add_task(async function test_nonexistent_file() {
+  _("Try loading a non-existent file.");
+  let val = await Utils.jsonLoad("non-existent", {});
+  Assert.equal(val, undefined);
+});
+
+add_task(async function test_save_logging() {
+  _("Verify that writes are logged.");
+  let trace;
+  await Utils.jsonSave(
+    "log",
+    {
+      _log: {
+        trace(msg) {
+          trace = msg;
+        },
+      },
+    },
+    "hi"
+  );
+  Assert.ok(!!trace);
+});
+
+add_task(async function test_load_logging() {
+  _("Verify that reads and read errors are logged.");
+
+  // Write a file with some invalid JSON
+  let file = await IOUtils.getFile(PathUtils.profileDir, "weave", "log.json");
+  let fos = Cc["@mozilla.org/network/file-output-stream;1"].createInstance(
+    Ci.nsIFileOutputStream
+  );
+  let flags =
+    FileUtils.MODE_WRONLY | FileUtils.MODE_CREATE | FileUtils.MODE_TRUNCATE;
+  fos.init(file, flags, FileUtils.PERMS_FILE, fos.DEFER_OPEN);
+  let stream = Cc["@mozilla.org/intl/converter-output-stream;1"].createInstance(
+    Ci.nsIConverterOutputStream
+  );
+  stream.init(fos, "UTF-8");
+  stream.writeString("invalid json!");
+  stream.close();
+
+  let trace, debug;
+  let obj = {
+    _log: {
+      trace(msg) {
+        trace = msg;
+      },
+      debug(msg) {
+        debug = msg;
+      },
+    },
+  };
+  let val = await Utils.jsonLoad("log", obj);
+  Assert.ok(!val);
+  Assert.ok(!!trace);
+  Assert.ok(!!debug);
+});