1 files changed, 119 insertions, 0 deletions
diff --git a/services/sync/tests/unit/test_utils_catch.js b/services/sync/tests/unit/test_utils_catch.js
new file mode 100644
index 0000000000..590d04527f
--- /dev/null
+++ b/services/sync/tests/unit/test_utils_catch.js
@@ -0,0 +1,119 @@
+const { Service } = ChromeUtils.importESModule(
+  "resource://services-sync/service.sys.mjs"
+);
+
+add_task(async function run_test() {
+  _("Make sure catch when copied to an object will correctly catch stuff");
+  let ret, rightThis, didCall, didThrow, wasCovfefe, wasLocked;
+  let obj = {
+    _catch: Utils.catch,
+    _log: {
+      debug(str) {
+        didThrow = str.search(/^Exception/) == 0;
+      },
+      info(str) {
+        wasLocked = str.indexOf("Cannot start sync: already syncing?") == 0;
+      },
+    },
+
+    func() {
+      return this._catch(async function () {
+        rightThis = this == obj;
+        didCall = true;
+        return 5;
+      })();
+    },
+
+    throwy() {
+      return this._catch(async function () {
+        rightThis = this == obj;
+        didCall = true;
+        throw new Error("covfefe");
+      })();
+    },
+
+    callbacky() {
+      return this._catch(
+        async function () {
+          rightThis = this == obj;
+          didCall = true;
+          throw new Error("covfefe");
+        },
+        async function (ex) {
+          wasCovfefe = ex && ex.message == "covfefe";
+        }
+      )();
+    },
+
+    lockedy() {
+      return this._catch(async function () {
+        rightThis = this == obj;
+        didCall = true;
+        Utils.throwLockException(null);
+      })();
+    },
+
+    lockedy_chained() {
+      return this._catch(async function () {
+        rightThis = this == obj;
+        didCall = true;
+        Utils.throwLockException(null);
+      })();
+    },
+  };
+
+  _("Make sure a normal call will call and return");
+  rightThis = didCall = didThrow = wasLocked = false;
+  ret = await obj.func();
+  Assert.equal(ret, 5);
+  Assert.ok(rightThis);
+  Assert.ok(didCall);
+  Assert.ok(!didThrow);
+  Assert.equal(wasCovfefe, undefined);
+  Assert.ok(!wasLocked);
+
+  _(
+    "Make sure catch/throw results in debug call and caller doesn't need to handle exception"
+  );
+  rightThis = didCall = didThrow = wasLocked = false;
+  ret = await obj.throwy();
+  Assert.equal(ret, undefined);
+  Assert.ok(rightThis);
+  Assert.ok(didCall);
+  Assert.ok(didThrow);
+  Assert.equal(wasCovfefe, undefined);
+  Assert.ok(!wasLocked);
+
+  _("Test callback for exception testing.");
+  rightThis = didCall = didThrow = wasLocked = false;
+  ret = await obj.callbacky();
+  Assert.equal(ret, undefined);
+  Assert.ok(rightThis);
+  Assert.ok(didCall);
+  Assert.ok(didThrow);
+  Assert.ok(wasCovfefe);
+  Assert.ok(!wasLocked);
+
+  _("Test the lock-aware catch that Service uses.");
+  obj._catch = Service._catch;
+  rightThis = didCall = didThrow = wasLocked = false;
+  wasCovfefe = undefined;
+  ret = await obj.lockedy();
+  Assert.equal(ret, undefined);
+  Assert.ok(rightThis);
+  Assert.ok(didCall);
+  Assert.ok(didThrow);
+  Assert.equal(wasCovfefe, undefined);
+  Assert.ok(wasLocked);
+
+  _("Test the lock-aware catch that Service uses with a chained promise.");
+  rightThis = didCall = didThrow = wasLocked = false;
+  wasCovfefe = undefined;
+  ret = await obj.lockedy_chained();
+  Assert.equal(ret, undefined);
+  Assert.ok(rightThis);
+  Assert.ok(didCall);
+  Assert.ok(didThrow);
+  Assert.equal(wasCovfefe, undefined);
+  Assert.ok(wasLocked);
+});