Improve display of edited events

test/test-utils/test-utils.ts

@@ -38,6 +38,8 @@ import { normalize } from "matrix-js-sdk/src/utils";
 import { ReEmitter } from "matrix-js-sdk/src/ReEmitter";
 import { MediaHandler } from "matrix-js-sdk/src/webrtc/mediaHandler";
 import { Feature, ServerSupport } from "matrix-js-sdk/src/feature";
+import { CryptoBackend } from "matrix-js-sdk/src/common-crypto/CryptoBackend";
+import { IEventDecryptionResult } from "matrix-js-sdk/src/@types/crypto";
 
 import type { GroupCall } from "matrix-js-sdk/src/webrtc/groupCall";
 import { MatrixClientPeg as peg } from "../../src/MatrixClientPeg";
@@ -315,6 +317,51 @@ export function mkEvent(opts: MakeEventProps): MatrixEvent {
     return mxEvent;
 }
 
+/**
+ * Create an m.room.encrypted event
+ *
+ * @param opts - Values for the event
+ * @param opts.room - The ID of the room for the event
+ * @param opts.user - The sender of the event
+ * @param opts.plainType - The type the event will have, once it has been decrypted
+ * @param opts.plainContent - The content the event will have, once it has been decrypted
+ */
+export async function mkEncryptedEvent(opts: {
+    room: Room["roomId"];
+    user: User["userId"];
+    plainType: string;
+    plainContent: IContent;
+}): Promise<MatrixEvent> {
+    // we construct an event which has been decrypted by stubbing out CryptoBackend.decryptEvent and then
+    // calling MatrixEvent.attemptDecryption.
+
+    const mxEvent = mkEvent({
+        type: "m.room.encrypted",
+        room: opts.room,
+        user: opts.user,
+        event: true,
+        content: {},
+    });
+
+    const decryptionResult: IEventDecryptionResult = {
+        claimedEd25519Key: "",
+        clearEvent: {
+            type: opts.plainType,
+            content: opts.plainContent,
+        },
+        forwardingCurve25519KeyChain: [],
+        senderCurve25519Key: "",
+        untrusted: false,
+    };
+
+    const mockCrypto = {
+        decryptEvent: async (_ev): Promise<IEventDecryptionResult> => decryptionResult,
+    } as CryptoBackend;
+
+    await mxEvent.attemptDecryption(mockCrypto);
+    return mxEvent;
+}
+
 /**
  * Create an m.room.member event.
  * @param {Object} opts Values for the membership.