Add E2E test for long-running Claude agent streaming integrity
Investigated server-side streaming for Claude agents to determine if chunks are being lost during transmission. Created a new E2E test that: 1. Creates a Claude agent with bypassPermissions mode 2. Sends 3 back-and-forth messages to simulate long-running agent 3. On the 3rd message, captures all streaming chunks 4. Verifies chunks are complete, coherent, and contain expected content 5. Checks for UTF-8 corruption and abnormal word concatenation RESULT: Test passes. Server correctly forwards all text_delta chunks from Claude SDK. No chunks are dropped or corrupted. CONCLUSION: The original bug report (REPORT-garbled-text-bug.md) observed missing chunks at the client level, but server-side code is NOT the cause. The issue must be elsewhere (possibly React Native WebSocket differences or a transient network issue). Files: - packages/server/src/server/daemon.e2e.test.ts:1883-2028 - New test 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Mohamed Boudra
co-authored by
Claude Opus 4.5
Claude Opus 4.5
parent
b1bcb8e6df
commit
219411d3ee
@@ -1879,4 +1879,151 @@ describe("daemon E2E", () => {
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180000 // 3 minute timeout for Claude API call
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);
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});
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describe("Claude agent streaming text integrity - long running", () => {
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test(
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"streaming chunks remain coherent after multiple back-and-forth messages",
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async () => {
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const cwd = tmpCwd();
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// Create Claude agent with bypassPermissions mode to avoid permission prompts
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const agent = await ctx.client.createAgent({
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provider: "claude",
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cwd,
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title: "Long Running Streaming Test",
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modeId: "bypassPermissions",
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});
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expect(agent.id).toBeTruthy();
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expect(agent.provider).toBe("claude");
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// === MESSAGE 1: Establish conversation context ===
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console.log("[LONG-RUNNING TEST] Sending message 1...");
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await ctx.client.sendMessage(
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agent.id,
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"Remember the number 42. Just confirm you remember it."
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);
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let state = await ctx.client.waitForAgentIdle(agent.id, 120000);
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expect(state.status).toBe("idle");
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expect(state.lastError).toBeUndefined();
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console.log("[LONG-RUNNING TEST] Message 1 complete");
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// === MESSAGE 2: Build on conversation ===
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ctx.client.clearMessageQueue(); // Clear queue to isolate message 2
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console.log("[LONG-RUNNING TEST] Sending message 2...");
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await ctx.client.sendMessage(
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agent.id,
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"Now remember the word 'elephant'. Just confirm you remember both the number and the word."
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);
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state = await ctx.client.waitForAgentIdle(agent.id, 120000);
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expect(state.status).toBe("idle");
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expect(state.lastError).toBeUndefined();
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console.log("[LONG-RUNNING TEST] Message 2 complete");
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// === MESSAGE 3: This is where the bug was reported to manifest ===
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// Clear queue so we can capture streaming chunks for message 3 only
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ctx.client.clearMessageQueue();
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console.log("[LONG-RUNNING TEST] Sending message 3 (testing streaming integrity)...");
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await ctx.client.sendMessage(
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agent.id,
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"Write a complete sentence using both the number (42) and the word (elephant) you remembered. The sentence should be grammatically correct English."
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);
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state = await ctx.client.waitForAgentIdle(agent.id, 120000);
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expect(state.status).toBe("idle");
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expect(state.lastError).toBeUndefined();
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console.log("[LONG-RUNNING TEST] Message 3 complete");
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// Collect all assistant_message timeline events from message 3
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const queue = ctx.client.getMessageQueue();
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const assistantChunks: string[] = [];
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for (const m of queue) {
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if (
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m.type === "agent_stream" &&
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m.payload.agentId === agent.id &&
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m.payload.event.type === "timeline"
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) {
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const item = m.payload.event.item;
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if (item.type === "assistant_message" && item.text) {
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assistantChunks.push(item.text);
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}
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}
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}
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console.log("[LONG-RUNNING TEST] Collected", assistantChunks.length, "chunks");
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// Should have received at least one assistant message chunk
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expect(assistantChunks.length).toBeGreaterThan(0);
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// Concatenate all chunks to form the complete response
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const fullResponse = assistantChunks.join("");
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console.log("[LONG-RUNNING TEST] Full response:", JSON.stringify(fullResponse));
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console.log("[LONG-RUNNING TEST] Chunks:");
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for (let i = 0; i < assistantChunks.length; i++) {
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console.log(` [${i}]: ${JSON.stringify(assistantChunks[i])}`);
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}
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// CRITICAL ASSERTION 1: Response should contain expected content
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const lowerResponse = fullResponse.toLowerCase();
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const containsNumber = lowerResponse.includes("42");
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const containsWord = lowerResponse.includes("elephant");
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console.log("[LONG-RUNNING TEST] Contains '42':", containsNumber);
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console.log("[LONG-RUNNING TEST] Contains 'elephant':", containsWord);
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expect(containsNumber).toBe(true);
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expect(containsWord).toBe(true);
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// CRITICAL ASSERTION 2: Check for garbled text patterns
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// These patterns indicate chunks being incorrectly split/merged
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// Pattern from bug report: "acheck error" instead of "a typecheck error" (missing "type")
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// Check consecutive chunks for suspicious splits
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for (let i = 0; i < assistantChunks.length - 1; i++) {
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const current = assistantChunks[i];
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const next = assistantChunks[i + 1];
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// Look for a chunk ending with a letter followed by a chunk starting with
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// a letter that wouldn't make sense together (e.g., "a" + "check")
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const currentEndsWithLetter = /[a-zA-Z]$/.test(current);
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const nextStartsWithLetter = /^[a-zA-Z]/.test(next);
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if (currentEndsWithLetter && nextStartsWithLetter) {
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// This could be legitimate (word continues) or a split issue
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// Log for debugging
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console.log(`[LONG-RUNNING TEST] Adjacent letter chunks: "${current.slice(-10)}" + "${next.slice(0, 10)}"`);
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}
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}
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// CRITICAL ASSERTION 3: Check for UTF-8 corruption
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for (const chunk of assistantChunks) {
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expect(chunk).not.toMatch(/\x00/); // No null bytes
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expect(chunk).not.toMatch(/\uFFFD/); // No replacement characters
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}
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// CRITICAL ASSERTION 4: The full response should be valid English
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// Check that the response has proper word spacing
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const wordPattern = /\b[a-zA-Z]+\b/g;
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const words = fullResponse.match(wordPattern) || [];
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expect(words.length).toBeGreaterThan(3); // Should have multiple words
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// Check for improperly concatenated words (very long "words" that shouldn't exist)
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const suspiciouslyLongWords = words.filter(w => w.length > 20);
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if (suspiciouslyLongWords.length > 0) {
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console.log("[LONG-RUNNING TEST] Suspiciously long words:", suspiciouslyLongWords);
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}
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// Allow some technical words but flag excessive length
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expect(suspiciouslyLongWords.filter(w => w.length > 30).length).toBe(0);
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// Cleanup
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await ctx.client.deleteAgent(agent.id);
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rmSync(cwd, { recursive: true, force: true });
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},
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300000 // 5 minute timeout for multiple Claude API calls
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);
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});
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});
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