File size: 8,558 Bytes
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import { parseStreamingResponse } from '../streaming-parser';
function makeSSEStream(chunks: string[]): Response {
const encoder = new TextEncoder();
const stream = new ReadableStream({
start(controller) {
for (const chunk of chunks) {
controller.enqueue(encoder.encode(chunk));
}
controller.close();
},
});
return new Response(stream);
}
function sseChunk(data: object): string {
return `data: ${JSON.stringify(data)}\n\n`;
}
describe('streaming-parser reasoning merge', () => {
it('merges id-less reasoning_details into a single entry', async () => {
const chunks = [
sseChunk({
choices: [{ delta: { reasoning_details: [{ type: 'thinking', text: 'First ' }] }, index: 0 }],
}),
sseChunk({
choices: [{ delta: { reasoning_details: [{ type: 'thinking', text: 'second ' }] }, index: 0 }],
}),
sseChunk({
choices: [{ delta: { reasoning_details: [{ type: 'thinking', text: 'third.' }] }, index: 0 }],
}),
sseChunk({ choices: [{ delta: { content: 'Answer.' }, index: 0, finish_reason: 'stop' }] }),
'data: [DONE]\n\n',
];
const response = makeSSEStream(chunks);
const result = await parseStreamingResponse(response, { provider: 'openrouter', model: 'test' });
expect(result.reasoningDetails).toHaveLength(1);
expect(result.reasoningDetails![0].text).toBe('First second third.');
expect(result.content).toBe('Answer.');
});
it('keeps entries with different ids separate', async () => {
const chunks = [
sseChunk({
choices: [{ delta: { reasoning_details: [{ id: 'r1', type: 'thinking', text: 'Block 1' }] }, index: 0 }],
}),
sseChunk({
choices: [{ delta: { reasoning_details: [{ id: 'r2', type: 'thinking', text: 'Block 2' }] }, index: 0 }],
}),
sseChunk({ choices: [{ delta: { content: 'Done.' }, index: 0, finish_reason: 'stop' }] }),
'data: [DONE]\n\n',
];
const response = makeSSEStream(chunks);
const result = await parseStreamingResponse(response, { provider: 'openrouter', model: 'test' });
expect(result.reasoningDetails).toHaveLength(2);
expect(result.reasoningDetails![0].text).toBe('Block 1');
expect(result.reasoningDetails![1].text).toBe('Block 2');
});
it('updates existing entry by id (cumulative snapshot pattern)', async () => {
const chunks = [
sseChunk({
choices: [{ delta: { reasoning_details: [{ id: 'r1', type: 'thinking', text: 'Hello' }] }, index: 0 }],
}),
sseChunk({
choices: [{ delta: { reasoning_details: [{ id: 'r1', type: 'thinking', text: 'Hello world' }] }, index: 0 }],
}),
sseChunk({ choices: [{ delta: { content: 'Done.' }, index: 0, finish_reason: 'stop' }] }),
'data: [DONE]\n\n',
];
const response = makeSSEStream(chunks);
const result = await parseStreamingResponse(response, { provider: 'gemini', model: 'test' });
expect(result.reasoningDetails).toHaveLength(1);
expect(result.reasoningDetails![0].text).toBe('Hello world');
});
it('creates synthetic reasoningDetails entry from reasoning buffer', async () => {
const chunks = [
sseChunk({
choices: [{ delta: { reasoning: 'Thinking about this...' }, index: 0 }],
}),
sseChunk({ choices: [{ delta: { content: 'Answer.' }, index: 0, finish_reason: 'stop' }] }),
'data: [DONE]\n\n',
];
const response = makeSSEStream(chunks);
const result = await parseStreamingResponse(response, { provider: 'openrouter', model: 'deepseek-reasoner' });
expect(result.reasoning).toBe('Thinking about this...');
expect(result.reasoningDetails).toHaveLength(1);
expect(result.reasoningDetails![0].type).toBe('thinking');
expect(result.reasoningDetails![0].text).toBe('Thinking about this...');
});
it('does not create synthetic entry when reasoningDetails already has text', async () => {
const chunks = [
sseChunk({
choices: [{ delta: { reasoning: 'incremental', reasoning_details: [{ type: 'thinking', text: 'incremental' }] }, index: 0 }],
}),
sseChunk({ choices: [{ delta: { content: 'Done.' }, index: 0, finish_reason: 'stop' }] }),
'data: [DONE]\n\n',
];
const response = makeSSEStream(chunks);
const result = await parseStreamingResponse(response, { provider: 'openrouter', model: 'test' });
expect(result.reasoningDetails).toHaveLength(1);
expect(result.reasoningDetails![0].text).toBe('incremental');
});
it('emits reasoning_delta progress events for merged chunks', async () => {
const progressEvents: { event: string; data: any }[] = [];
const onProgress = (event: string, data?: any) => progressEvents.push({ event, data });
const chunks = [
sseChunk({
choices: [{ delta: { reasoning_details: [{ type: 'thinking', text: 'A' }] }, index: 0 }],
}),
sseChunk({
choices: [{ delta: { reasoning_details: [{ type: 'thinking', text: 'B' }] }, index: 0 }],
}),
sseChunk({ choices: [{ delta: { content: 'X' }, index: 0, finish_reason: 'stop' }] }),
'data: [DONE]\n\n',
];
const response = makeSSEStream(chunks);
await parseStreamingResponse(response, { provider: 'openrouter', model: 'test', onProgress });
const reasoningDeltas = progressEvents.filter(e => e.event === 'reasoning_delta');
expect(reasoningDeltas).toHaveLength(2);
expect(reasoningDeltas[0].data.text).toBe('A');
expect(reasoningDeltas[1].data.text).toBe('B');
});
});
describe('streaming-parser reasoning_complete closure', () => {
function collectProgress() {
const progressEvents: { event: string; data?: any }[] = [];
const onProgress = (event: string, data?: any) => progressEvents.push({ event, data });
return { progressEvents, onProgress };
}
it('emits reasoning_complete at stream end for a reasoning-only response (delta.reasoning)', async () => {
const { progressEvents, onProgress } = collectProgress();
const chunks = [
sseChunk({ choices: [{ delta: { reasoning: 'Thinking about it. ' }, index: 0 }] }),
sseChunk({ choices: [{ delta: { reasoning: 'Still thinking.' }, index: 0, finish_reason: 'stop' }] }),
'data: [DONE]\n\n',
];
await parseStreamingResponse(makeSSEStream(chunks), { provider: 'openrouter', model: 'test', onProgress });
const completes = progressEvents.filter(e => e.event === 'reasoning_complete');
expect(completes).toHaveLength(1);
expect(completes[0].data.reasoning).toBe('Thinking about it. Still thinking.');
});
it('emits reasoning_complete exactly once when delta.reasoning is followed by content', async () => {
const { progressEvents, onProgress } = collectProgress();
const chunks = [
sseChunk({ choices: [{ delta: { reasoning: 'Plan first.' }, index: 0 }] }),
sseChunk({ choices: [{ delta: { content: 'The answer.' }, index: 0, finish_reason: 'stop' }] }),
'data: [DONE]\n\n',
];
await parseStreamingResponse(makeSSEStream(chunks), { provider: 'openrouter', model: 'test', onProgress });
expect(progressEvents.filter(e => e.event === 'reasoning_complete')).toHaveLength(1);
});
it('does not duplicate reasoning_complete when the think-block was already closed by tool calls', async () => {
const { progressEvents, onProgress } = collectProgress();
const chunks = [
sseChunk({ choices: [{ delta: { content: '<think>Let me act.' }, index: 0 }] }),
sseChunk({
choices: [{
delta: { tool_calls: [{ index: 0, id: 'tc1', function: { name: 'bash', arguments: '{"command":"ls"}' } }] },
index: 0,
finish_reason: 'tool_calls',
}],
}),
'data: [DONE]\n\n',
];
await parseStreamingResponse(makeSSEStream(chunks), { provider: 'openrouter', model: 'test', onProgress });
expect(progressEvents.filter(e => e.event === 'reasoning_complete')).toHaveLength(1);
});
it('does not emit reasoning_complete when there was no reasoning', async () => {
const { progressEvents, onProgress } = collectProgress();
const chunks = [
sseChunk({ choices: [{ delta: { content: 'Plain answer.' }, index: 0, finish_reason: 'stop' }] }),
'data: [DONE]\n\n',
];
await parseStreamingResponse(makeSSEStream(chunks), { provider: 'openrouter', model: 'test', onProgress });
expect(progressEvents.filter(e => e.event === 'reasoning_complete')).toHaveLength(0);
});
});
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