Expose and pre-populate thread ID in devtools dialog (#10953)

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

test/components/views/dialogs/devtools/Event-test.tsx

@@ -0,0 +1,71 @@
+/*
+Copyright 2023 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from "react";
+import { render } from "@testing-library/react";
+import { Room } from "matrix-js-sdk/src/models/room";
+import { PendingEventOrdering } from "matrix-js-sdk/src/client";
+
+import MatrixClientContext from "../../../../../src/contexts/MatrixClientContext";
+import { MatrixClientPeg } from "../../../../../src/MatrixClientPeg";
+import { stubClient } from "../../../../test-utils";
+import { DevtoolsContext } from "../../../../../src/components/views/dialogs/devtools/BaseTool";
+import { TimelineEventEditor } from "../../../../../src/components/views/dialogs/devtools/Event";
+
+describe("<EventEditor />", () => {
+    beforeEach(() => {
+        stubClient();
+    });
+
+    it("should render", () => {
+        const cli = MatrixClientPeg.safeGet();
+        const { asFragment } = render(
+            <MatrixClientContext.Provider value={cli}>
+                <DevtoolsContext.Provider
+                    value={{
+                        room: new Room("!roomId", cli, "@alice:example.com", {
+                            pendingEventOrdering: PendingEventOrdering.Detached,
+                        }),
+                    }}
+                >
+                    <TimelineEventEditor onBack={() => {}} />
+                </DevtoolsContext.Provider>
+            </MatrixClientContext.Provider>,
+        );
+        expect(asFragment()).toMatchSnapshot();
+    });
+
+    describe("thread context", () => {
+        it("should pre-populate a thread relationship", () => {
+            const cli = MatrixClientPeg.safeGet();
+            const { asFragment } = render(
+                <MatrixClientContext.Provider value={cli}>
+                    <DevtoolsContext.Provider
+                        value={{
+                            room: new Room("!roomId", cli, "@alice:example.com", {
+                                pendingEventOrdering: PendingEventOrdering.Detached,
+                            }),
+                            threadRootId: "$this_is_a_thread_id",
+                        }}
+                    >
+                        <TimelineEventEditor onBack={() => {}} />
+                    </DevtoolsContext.Provider>
+                </MatrixClientContext.Provider>,
+            );
+            expect(asFragment()).toMatchSnapshot();
+        });
+    });
+});