Add compaction+sessionFs test

Author: SteveSandersonMS

nodejs/test/e2e/session_fs.test.ts

@@ -2,6 +2,7 @@
  *  Copyright (c) Microsoft Corporation. All rights reserved.
  *--------------------------------------------------------------------------------------------*/
 
+import { SessionCompactionCompleteEvent } from "@github/copilot/sdk";
 import { MemoryProvider, VirtualProvider } from "@platformatic/vfs";
 import { describe, expect, it, onTestFinished } from "vitest";
 import { CopilotClient } from "../../src/client.js";
@@ -124,6 +125,26 @@ describe("Session Fs", async () => {
         const fileContent = await provider.readFile(p(session.sessionId, filename!), "utf8");
         expect(fileContent).toBe(suppliedFileContent);
     });
+
+    it("should succeed with compaction while using sessionFs", async () => {
+        const session = await client.createSession({
+            onPermissionRequest: approveAll,
+            createSessionFsHandler,
+        });
+
+        let compactionEvent: SessionCompactionCompleteEvent | undefined;
+        session.on("session.compaction_complete", (evt) => (compactionEvent = evt));
+
+        await session.sendAndWait({ prompt: "What is 2+2?" });
+
+        const eventsPath = p(session.sessionId, "/session-state/events.jsonl");
+        await expect.poll(() => provider.exists(eventsPath)).toBe(true);
+
+        await session.rpc.compaction.compact();
+        await expect.poll(() => compactionEvent).toBeDefined();
+        expect(compactionEvent!.data.success).toBe(true);
+        expect(compactionEvent!.data.summaryContent).toContain("<overview>");
+    });
 });
 
 function findToolCallResult(messages: SessionEvent[], toolName: string): string | undefined {

test/snapshots/session_fs/should_succeed_with_compaction_while_using_sessionfs.yaml

@@ -0,0 +1,75 @@
+models:
+  - claude-sonnet-4.5
+conversations:
+  - messages:
+      - role: system
+        content: ${system}
+      - role: user
+        content: What is 2+2?
+      - role: assistant
+        content: 2 + 2 = 4
+      - role: user
+        content: ${compaction_prompt}
+      - role: assistant
+        content: >-
+          <overview>
+
+          The user asked a simple arithmetic question ("What is 2+2?"). This was a minimal interaction with no technical
+          work, coding tasks, or file modifications requested or performed. The conversation consisted solely of
+          providing a basic mathematical answer.
+
+          </overview>
+
+
+          <history>
+
+          1. The user asked "What is 2+2?"
+             - Provided the answer: 4
+             - No further requests or actions were needed
+
+          2. The user requested a checkpoint summary
+             - Creating this summary to preserve conversation context before history compaction
+          </history>
+
+
+          <work_done>
+
+          No files were created, modified, or deleted. No technical work was performed. The conversation consisted only
+          of answering a simple arithmetic question.
+
+
+          Current state:
+
+          - No active tasks
+
+          - No code changes
+
+          - No systems or processes started
+
+          </work_done>
+
+
+          <technical_details>
+
+          No technical work was performed during this conversation. No technical decisions, issues, or discoveries were
+          made.
+
+          </technical_details>
+
+
+          <important_files>
+
+          No files are relevant to this conversation, as no technical work was performed.
+
+          </important_files>
+
+
+          <next_steps>
+
+          No pending work or next steps. The user's request (answering "2+2") has been completed. Awaiting further
+          instructions from the user.
+
+          </next_steps>
+
+
+          <checkpoint_title>Simple arithmetic question answered</checkpoint_title>