test: ffi: ts: fix test

We return a different error structure now, so we have to adjust the
test.
I adjusted the way we test the to match the errors tests. We check
conditions in the browser context and then assert the results outside
the browser context.

Author: fewerner

crypto-ffi/bindings/js/test/wdio/transactionContext.test.ts

@@ -5,6 +5,7 @@ import {
     CoreCryptoError,
     CoreCryptoContext,
     ErrorType,
+    isMlsOtherError,
 } from "../../src/CoreCrypto";
 
 beforeEach(async () => {
@@ -43,7 +44,9 @@ describe("transaction context", () => {
         const alice = crypto.randomUUID();
         await ccInit(alice);
 
-        const error = await browser.execute(async (clientName) => {
+        const result = await browser.execute(async (clientName) => {
+
+            const isMlsOtherError = window.ccModule.isMlsOtherError;
             const cc = window.ensureCcDefined(clientName);
 
             let context: CoreCryptoContext | null = null;
@@ -58,16 +61,18 @@ describe("transaction context", () => {
                     1
                 );
             } catch (err) {
-                const error = err as CoreCryptoError<ErrorType>;
-                return { name: error.name, message: error.message };
+                console.log(JSON.stringify(err))
+                return {
+                    errorWasThrown: true,
+                    isCorrectInstance: isMlsOtherError(err),
+                    contextMatches: err.context.context.msg === "This transaction context has already been finished and can no longer be used."
+                };
             }
             return null;
         }, alice);
-        expect(error).not.toBeNull();
-        expect(error?.name).toEqual("MlsErrorOther");
-        expect(error?.message).toEqual(
-            "This transaction context has already been finished and can no longer be used."
-        );
+        expect(result.errorWasThrown).toBe(true);
+        expect(result.isCorrectInstance).toBe(true);
+        expect(result.contextMatches).toBe(true);
     });
 
     it("should roll back transaction after error", async () => {
@@ -78,7 +83,7 @@ describe("transaction context", () => {
             const cc = window.ensureCcDefined(clientName);
             const basicCredentialType = window.ccModule.CredentialType.Basic;
             const conversationId = new window.ccModule.ConversationId(
-                new TextEncoder().encode("testConversation")
+                new TextEncoder().encode("testConversation").buffer
             );
 
             const expectedError = new Error("Message of expected error", {