fix(coding-agent): unify compaction UI events closes #2617

packages/coding-agent/test/interactive-mode-compaction.test.ts

@@ -0,0 +1,50 @@
+import { describe, expect, test, vi } from "vitest";
+import { InteractiveMode } from "../src/modes/interactive/interactive-mode.js";
+
+describe("InteractiveMode compaction events", () => {
+	test("rebuilds chat without appending a duplicate compaction summary", async () => {
+		const fakeThis = {
+			isInitialized: true,
+			footer: { invalidate: vi.fn() },
+			autoCompactionEscapeHandler: undefined as (() => void) | undefined,
+			autoCompactionLoader: undefined,
+			defaultEditor: {},
+			statusContainer: { clear: vi.fn() },
+			chatContainer: { clear: vi.fn() },
+			rebuildChatFromMessages: vi.fn(),
+			addMessageToChat: vi.fn(),
+			showError: vi.fn(),
+			showStatus: vi.fn(),
+			flushCompactionQueue: vi.fn().mockResolvedValue(undefined),
+			ui: { requestRender: vi.fn() },
+		};
+
+		const handleEvent = Reflect.get(InteractiveMode.prototype, "handleEvent") as (
+			this: typeof fakeThis,
+			event: {
+				type: "compaction_end";
+				reason: "manual" | "threshold" | "overflow";
+				result: { tokensBefore: number; summary: string } | undefined;
+				aborted: boolean;
+				willRetry: boolean;
+				errorMessage?: string;
+			},
+		) => Promise<void>;
+
+		await handleEvent.call(fakeThis, {
+			type: "compaction_end",
+			reason: "manual",
+			result: {
+				tokensBefore: 123,
+				summary: "summary",
+			},
+			aborted: false,
+			willRetry: false,
+		});
+
+		expect(fakeThis.chatContainer.clear).toHaveBeenCalledTimes(1);
+		expect(fakeThis.rebuildChatFromMessages).toHaveBeenCalledTimes(1);
+		expect(fakeThis.addMessageToChat).not.toHaveBeenCalled();
+		expect(fakeThis.flushCompactionQueue).toHaveBeenCalledWith({ willRetry: false });
+	});
+});