1 files changed, 91 insertions, 0 deletions
diff --git a/remote/shared/messagehandler/test/xpcshell/test_Errors.js b/remote/shared/messagehandler/test/xpcshell/test_Errors.js
new file mode 100644
index 0000000000..26187dac11
--- /dev/null
+++ b/remote/shared/messagehandler/test/xpcshell/test_Errors.js
@@ -0,0 +1,91 @@
+/* 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/. */
+
+const { error } = ChromeUtils.importESModule(
+  "chrome://remote/content/shared/messagehandler/Errors.sys.mjs"
+);
+
+// Note: this test file is similar to remote/shared/webdriver/test/xpcshell/test_Errors.js
+// because shared/webdriver/Errors.jsm and shared/messagehandler/Errors.jsm share
+// similar helpers.
+
+add_task(function test_toJSON() {
+  let e0 = new error.MessageHandlerError();
+  let e0s = e0.toJSON();
+  equal(e0s.error, "message handler error");
+  equal(e0s.message, "");
+
+  let e1 = new error.MessageHandlerError("a");
+  let e1s = e1.toJSON();
+  equal(e1s.message, e1.message);
+
+  let e2 = new error.UnsupportedCommandError("foo");
+  let e2s = e2.toJSON();
+  equal(e2.status, e2s.error);
+  equal(e2.message, e2s.message);
+});
+
+add_task(function test_fromJSON() {
+  Assert.throws(
+    () => error.MessageHandlerError.fromJSON({ error: "foo" }),
+    /Not of MessageHandlerError descent/
+  );
+  Assert.throws(
+    () => error.MessageHandlerError.fromJSON({ error: "Error" }),
+    /Not of MessageHandlerError descent/
+  );
+  Assert.throws(
+    () => error.MessageHandlerError.fromJSON({}),
+    /Undeserialisable error type/
+  );
+  Assert.throws(
+    () => error.MessageHandlerError.fromJSON(undefined),
+    /TypeError/
+  );
+
+  let e1 = new error.MessageHandlerError("1");
+  let e1r = error.MessageHandlerError.fromJSON({
+    error: "message handler error",
+    message: "1",
+  });
+  ok(e1r instanceof error.MessageHandlerError);
+  equal(e1r.name, e1.name);
+  equal(e1r.status, e1.status);
+  equal(e1r.message, e1.message);
+
+  let e2 = new error.UnsupportedCommandError("foo");
+  let e2r = error.MessageHandlerError.fromJSON({
+    error: "unsupported message handler command",
+    message: "foo",
+  });
+  ok(e2r instanceof error.MessageHandlerError);
+  ok(e2r instanceof error.UnsupportedCommandError);
+  equal(e2r.name, e2.name);
+  equal(e2r.status, e2.status);
+  equal(e2r.message, e2.message);
+
+  // parity with toJSON
+  let e3 = new error.UnsupportedCommandError("foo");
+  let e3toJSON = e3.toJSON();
+  let e3fromJSON = error.MessageHandlerError.fromJSON(e3toJSON);
+  equal(e3toJSON.error, e3fromJSON.status);
+  equal(e3toJSON.message, e3fromJSON.message);
+  equal(e3toJSON.stacktrace, e3fromJSON.stack);
+});
+
+add_task(function test_MessageHandlerError() {
+  let err = new error.MessageHandlerError("foo");
+  equal("MessageHandlerError", err.name);
+  equal("foo", err.message);
+  equal("message handler error", err.status);
+  ok(err instanceof error.MessageHandlerError);
+});
+
+add_task(function test_UnsupportedCommandError() {
+  let e = new error.UnsupportedCommandError("foo");
+  equal("UnsupportedCommandError", e.name);
+  equal("foo", e.message);
+  equal("unsupported message handler command", e.status);
+  ok(e instanceof error.MessageHandlerError);
+});