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* @license
* Copyright 2026 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { describe, expect, it, vi, beforeEach } from 'vitest';
import { FinishReason } from '@google/genai';
import { LegacyAgentSession } from './legacy-agent-session.js';
import type { LegacyAgentSessionDeps } from './legacy-agent-session.js';
import { GeminiEventType } from '../core/turn.js';
import type { ServerGeminiStreamEvent } from '../core/turn.js';
import type { AgentEvent, AgentSend } from './types.js';
import { ToolErrorType } from '../tools/tool-error.js';
import type {
CompletedToolCall,
ToolCallRequestInfo,
} from '../scheduler/types.js';
import { CoreToolCallStatus } from '../scheduler/types.js';
import type { GeminiClient } from '../core/client.js';
import type { Scheduler } from '../scheduler/scheduler.js';
import type { Config } from '../config/config.js';
// ---------------------------------------------------------------------------
// Mock helpers
// ---------------------------------------------------------------------------
function createMockDeps(
overrides?: Partial<LegacyAgentSessionDeps>,
): Required<LegacyAgentSessionDeps> {
const mockClient = {
sendMessageStream: vi.fn(),
getChat: vi.fn().mockReturnValue({
recordCompletedToolCalls: vi.fn(),
}),
getCurrentSequenceModel: vi.fn().mockReturnValue(null),
};
const mockScheduler = {
schedule: vi.fn().mockResolvedValue([]),
};
const mockConfig = {
getMaxSessionTurns: vi.fn().mockReturnValue(-1),
getModel: vi.fn().mockReturnValue('gemini-2.5-pro'),
getGeminiClient: vi.fn().mockReturnValue(mockClient),
getMessageBus: vi.fn().mockImplementation(() => ({
subscribe: vi.fn(),
unsubscribe: vi.fn(),
})),
};
return {
client: mockClient as unknown as GeminiClient,
scheduler: mockScheduler as unknown as Scheduler,
config: mockConfig as unknown as Config,
promptId: 'test-prompt',
streamId: 'test-stream',
getPreferredEditor: vi.fn().mockReturnValue(undefined),
...overrides,
} as Required<LegacyAgentSessionDeps>;
}
async function* makeStream(
events: ServerGeminiStreamEvent[],
): AsyncGenerator<ServerGeminiStreamEvent> {
for (const event of events) {
yield event;
}
}
function makeToolRequest(callId: string, name: string): ToolCallRequestInfo {
return {
callId,
name,
args: {},
isClientInitiated: false,
prompt_id: 'p1',
};
}
function makeMessageSend(
text: string,
displayContent?: string,
): Extract<AgentSend, { message: unknown }> {
return {
message: {
content: [{ type: 'text', text }],
...(displayContent ? { displayContent } : {}),
},
};
}
function makeCompletedToolCall(
callId: string,
name: string,
responseText: string,
): CompletedToolCall {
return {
status: CoreToolCallStatus.Success,
request: makeToolRequest(callId, name),
response: {
callId,
responseParts: [{ text: responseText }],
resultDisplay: responseText,
display: {
result: { type: 'text', text: responseText },
},
error: undefined,
errorType: undefined,
},
tool: {} as CompletedToolCall extends { tool: infer T } ? T : never,
invocation: {} as CompletedToolCall extends { invocation: infer T }
? T
: never,
} as CompletedToolCall;
}
async function collectEvents(
session: LegacyAgentSession,
options?: { streamId?: string; eventId?: string },
): Promise<AgentEvent[]> {
const events: AgentEvent[] = [];
const streamOptions =
options?.eventId || options?.streamId ? options : undefined;
for await (const event of streamOptions
? session.stream(streamOptions)
: session.stream()) {
events.push(event);
}
return events;
}
// ---------------------------------------------------------------------------
// Tests
// ---------------------------------------------------------------------------
describe('LegacyAgentSession', () => {
let deps: Required<LegacyAgentSessionDeps>;
beforeEach(() => {
deps = createMockDeps();
vi.useFakeTimers({ shouldAdvanceTime: true });
});
describe('send', () => {
it('returns streamId', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([
{ type: GeminiEventType.Content, value: 'hello' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const session = new LegacyAgentSession(deps);
const result = await session.send(makeMessageSend('hi'));
expect(result.streamId).toBe('test-stream');
});
it('records the sent user message in the trajectory before send resolves', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const session = new LegacyAgentSession(deps);
const { streamId } = await session.send({
message: {
content: [{ type: 'text', text: 'hi' }],
displayContent: 'raw input',
},
_meta: { source: 'user-test' },
});
const userMessage = session.events.find(
(e): e is AgentEvent<'message'> =>
e.type === 'message' && e.role === 'user' && e.streamId === streamId,
);
expect(userMessage?.content).toEqual([
{ type: 'text', text: 'raw input' },
]);
expect(userMessage?._meta).toEqual({ source: 'user-test' });
await vi.advanceTimersByTimeAsync(0);
expect(sendMock).toHaveBeenCalledWith(
[{ text: 'hi' }],
expect.any(AbortSignal),
'test-prompt',
undefined,
'raw input',
);
await collectEvents(session, { streamId: streamId ?? undefined });
});
it('returns streamId before emitting agent_start', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const session = new LegacyAgentSession(deps);
const liveEvents: AgentEvent[] = [];
session.subscribe((event) => {
liveEvents.push(event);
});
const { streamId } = await session.send(makeMessageSend('hi'));
expect(streamId).toBe('test-stream');
expect(liveEvents.some((event) => event.type === 'agent_start')).toBe(
false,
);
await collectEvents(session, { streamId: streamId ?? undefined });
expect(liveEvents.some((event) => event.type === 'agent_start')).toBe(
true,
);
});
it('throws for non-message payloads', async () => {
const session = new LegacyAgentSession(deps);
await expect(session.send({ update: { title: 'test' } })).rejects.toThrow(
'only supports message sends',
);
});
it('throws if send is called while a stream is active', async () => {
let resolveHang: (() => void) | undefined;
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
(async function* () {
await new Promise<void>((resolve) => {
resolveHang = resolve;
});
yield {
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
} as ServerGeminiStreamEvent;
})(),
);
const session = new LegacyAgentSession(deps);
const { streamId } = await session.send(makeMessageSend('first'));
await vi.advanceTimersByTimeAsync(0);
await expect(session.send(makeMessageSend('second'))).rejects.toThrow(
'cannot be called while a stream is active',
);
resolveHang?.();
await collectEvents(session, { streamId: streamId ?? undefined });
});
it('creates a new streamId after the previous stream completes', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock
.mockReturnValueOnce(
makeStream([
{ type: GeminiEventType.Content, value: 'first response' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
)
.mockReturnValueOnce(
makeStream([
{ type: GeminiEventType.Content, value: 'second response' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const session = new LegacyAgentSession(deps);
const first = await session.send(makeMessageSend('first'));
const firstEvents = await collectEvents(session, {
streamId: first.streamId ?? undefined,
});
const second = await session.send(makeMessageSend('second'));
const secondEvents = await collectEvents(session, {
streamId: second.streamId ?? undefined,
});
const userMessages = session.events.filter(
(e): e is AgentEvent<'message'> =>
e.type === 'message' && e.role === 'user',
);
expect(first.streamId).not.toBe(second.streamId);
expect(
userMessages.some(
(e) =>
e.streamId === first.streamId &&
e.content[0]?.type === 'text' &&
e.content[0].text === 'first',
),
).toBe(true);
expect(
userMessages.some(
(e) =>
e.streamId === second.streamId &&
e.content[0]?.type === 'text' &&
e.content[0].text === 'second',
),
).toBe(true);
expect(firstEvents.some((e) => e.type === 'agent_end')).toBe(true);
expect(secondEvents.some((e) => e.type === 'agent_end')).toBe(true);
});
});
describe('stream - basic flow', () => {
it('emits agent_start, content messages, and agent_end', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([
{ type: GeminiEventType.Content, value: 'Hello' },
{ type: GeminiEventType.Content, value: ' World' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
const types = events.map((e) => e.type);
expect(types).toContain('agent_start');
expect(types).toContain('message');
expect(types).toContain('agent_end');
const messages = events.filter(
(e): e is AgentEvent<'message'> =>
e.type === 'message' && e.role === 'agent',
);
expect(messages).toHaveLength(2);
expect(messages[0]?.content).toEqual([{ type: 'text', text: 'Hello' }]);
const streamEnd = events.find(
(e): e is AgentEvent<'agent_end'> => e.type === 'agent_end',
);
expect(streamEnd?.reason).toBe('completed');
});
});
describe('stream - tool calls', () => {
it('handles a tool call round-trip', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
// First turn: model requests a tool
sendMock.mockReturnValueOnce(
makeStream([
{
type: GeminiEventType.ToolCallRequest,
value: makeToolRequest('call-1', 'read_file'),
},
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
// Second turn: model provides final answer
sendMock.mockReturnValueOnce(
makeStream([
{ type: GeminiEventType.Content, value: 'Done!' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const scheduleMock = deps.scheduler.schedule as ReturnType<typeof vi.fn>;
scheduleMock.mockResolvedValueOnce([
makeCompletedToolCall('call-1', 'read_file', 'file contents'),
]);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('read a file'));
const events = await collectEvents(session);
const types = events.map((e) => e.type);
expect(types).toContain('tool_request');
expect(types).toContain('tool_response');
expect(types).toContain('agent_end');
const toolReq = events.find(
(e): e is AgentEvent<'tool_request'> => e.type === 'tool_request',
);
expect(toolReq?.name).toBe('read_file');
const toolResp = events.find(
(e): e is AgentEvent<'tool_response'> => e.type === 'tool_response',
);
expect(toolResp?.name).toBe('read_file');
expect(toolResp?.display).toEqual(
expect.objectContaining({
name: 'read_file',
result: { type: 'text', text: 'file contents' },
}),
);
expect(toolResp?.content).toEqual([
{ type: 'text', text: 'file contents' },
]);
expect(toolResp?.isError).toBe(false);
// Should have called sendMessageStream twice
expect(sendMock).toHaveBeenCalledTimes(2);
});
it('handles tool errors and sends error message in content', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValueOnce(
makeStream([
{
type: GeminiEventType.ToolCallRequest,
value: makeToolRequest('call-1', 'write_file'),
},
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
sendMock.mockReturnValueOnce(
makeStream([
{ type: GeminiEventType.Content, value: 'Failed' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const errorToolCall: CompletedToolCall = {
status: CoreToolCallStatus.Error,
request: makeToolRequest('call-1', 'write_file'),
response: {
callId: 'call-1',
responseParts: [{ text: 'stale' }],
resultDisplay: 'Error display',
error: new Error('Permission denied'),
errorType: 'permission_denied',
},
} as CompletedToolCall;
const scheduleMock = deps.scheduler.schedule as ReturnType<typeof vi.fn>;
scheduleMock.mockResolvedValueOnce([errorToolCall]);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('write file'));
const events = await collectEvents(session);
const toolResp = events.find(
(e): e is AgentEvent<'tool_response'> => e.type === 'tool_response',
);
expect(toolResp?.isError).toBe(true);
// Uses error.message, not responseParts
expect(toolResp?.content).toEqual([
{ type: 'text', text: 'Permission denied' },
]);
expect(toolResp?.display?.result).toEqual({
type: 'text',
text: 'Error display',
});
});
it('stops on STOP_EXECUTION tool error', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValueOnce(
makeStream([
{
type: GeminiEventType.ToolCallRequest,
value: makeToolRequest('call-1', 'dangerous_tool'),
},
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const stopToolCall: CompletedToolCall = {
status: CoreToolCallStatus.Error,
request: makeToolRequest('call-1', 'dangerous_tool'),
response: {
callId: 'call-1',
responseParts: [],
resultDisplay: undefined,
error: new Error('Stopped by policy'),
errorType: ToolErrorType.STOP_EXECUTION,
},
} as CompletedToolCall;
const scheduleMock = deps.scheduler.schedule as ReturnType<typeof vi.fn>;
scheduleMock.mockResolvedValueOnce([stopToolCall]);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('do something'));
const events = await collectEvents(session);
const streamEnd = events.find(
(e): e is AgentEvent<'agent_end'> => e.type === 'agent_end',
);
expect(streamEnd?.reason).toBe('completed');
// Should NOT make a second call
expect(sendMock).toHaveBeenCalledTimes(1);
});
it('treats fatal tool errors as tool_response followed by agent_end failed', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValueOnce(
makeStream([
{
type: GeminiEventType.ToolCallRequest,
value: makeToolRequest('call-1', 'write_file'),
},
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const fatalToolCall: CompletedToolCall = {
status: CoreToolCallStatus.Error,
request: makeToolRequest('call-1', 'write_file'),
response: {
callId: 'call-1',
responseParts: [],
resultDisplay: undefined,
error: new Error('Disk full'),
errorType: ToolErrorType.NO_SPACE_LEFT,
},
} as CompletedToolCall;
const scheduleMock = deps.scheduler.schedule as ReturnType<typeof vi.fn>;
scheduleMock.mockResolvedValueOnce([fatalToolCall]);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('write file'));
const events = await collectEvents(session);
const toolResp = events.find(
(e): e is AgentEvent<'tool_response'> => e.type === 'tool_response',
);
expect(toolResp?.isError).toBe(true);
expect(toolResp?.content).toEqual([{ type: 'text', text: 'Disk full' }]);
expect(
events.some(
(e): e is AgentEvent<'error'> =>
e.type === 'error' && e.fatal === true,
),
).toBe(false);
const streamEnd = events.findLast(
(e): e is AgentEvent<'agent_end'> => e.type === 'agent_end',
);
expect(streamEnd?.reason).toBe('failed');
expect(sendMock).toHaveBeenCalledTimes(1);
});
it('nudges the model if it returns an empty response after a tool execution', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
// First turn: model requests a tool
sendMock.mockReturnValueOnce(
makeStream([
{
type: GeminiEventType.ToolCallRequest,
value: makeToolRequest('call-1', 'read_file'),
},
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
// Second turn: model goes silent (returns empty text response, no tool calls)
sendMock.mockReturnValueOnce(
makeStream([
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
// Third turn (retry after nudge): model finally provides final answer
sendMock.mockReturnValueOnce(
makeStream([
{ type: GeminiEventType.Content, value: 'Analysis completed.' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const scheduleMock = deps.scheduler.schedule as ReturnType<typeof vi.fn>;
scheduleMock.mockResolvedValueOnce([
makeCompletedToolCall('call-1', 'read_file', 'file contents'),
]);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('read a file'));
const events = await collectEvents(session);
const types = events.map((e) => e.type);
expect(types).toContain('tool_request');
expect(types).toContain('tool_response');
expect(types).toContain('agent_end');
// The nudged turn should have called sendMessageStream a third time!
expect(sendMock).toHaveBeenCalledTimes(3);
// Verify that the third call received the correct system nudge message
expect(sendMock).toHaveBeenLastCalledWith(
[
{
text: '[System: You successfully executed a tool but returned an empty response. Please analyze the tool output and explain your progress or final answer.]',
},
],
expect.any(AbortSignal),
expect.any(String),
undefined,
undefined,
);
const messages = events.filter(
(e): e is AgentEvent<'message'> =>
e.type === 'message' && e.role === 'agent',
);
expect(
messages.some(
(m) =>
m.content[0] &&
'text' in m.content[0] &&
m.content[0].text === 'Analysis completed.',
),
).toBe(true);
});
});
describe('stream - terminal events', () => {
it('handles AgentExecutionStopped', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([
{
type: GeminiEventType.AgentExecutionStopped,
value: { reason: 'hook', systemMessage: 'Halted by hook' },
},
]),
);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
const streamEnd = events.find(
(e): e is AgentEvent<'agent_end'> => e.type === 'agent_end',
);
expect(streamEnd?.reason).toBe('completed');
expect(streamEnd?.data).toEqual({ message: 'Halted by hook' });
});
it('handles AgentExecutionBlocked as non-terminal and continues the stream', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([
{
type: GeminiEventType.AgentExecutionBlocked,
value: { reason: 'Blocked by hook' },
},
{ type: GeminiEventType.Content, value: 'Final answer' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
const blocked = events.find(
(e): e is AgentEvent<'error'> =>
e.type === 'error' && e._meta?.['code'] === 'AGENT_EXECUTION_BLOCKED',
);
expect(blocked?.fatal).toBe(false);
expect(blocked?.message).toBe('Blocked by hook');
const messages = events.filter(
(e): e is AgentEvent<'message'> =>
e.type === 'message' && e.role === 'agent',
);
expect(
messages.some(
(message) =>
message.content[0]?.type === 'text' &&
message.content[0].text === 'Final answer',
),
).toBe(true);
const streamEnd = events.find(
(e): e is AgentEvent<'agent_end'> => e.type === 'agent_end',
);
expect(streamEnd?.reason).toBe('completed');
});
it('handles Error events', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([
{
type: GeminiEventType.Error,
value: { error: new Error('API error') },
},
]),
);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
const err = events.find(
(e): e is AgentEvent<'error'> => e.type === 'error',
);
expect(err?.message).toBe('API error');
expect(events.some((e) => e.type === 'agent_end')).toBe(true);
});
it('handles LoopDetected as non-terminal warning event', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
// LoopDetected followed by more content — stream continues
sendMock.mockReturnValue(
makeStream([
{ type: GeminiEventType.LoopDetected },
{ type: GeminiEventType.Content, value: 'continuing after loop' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
const warning = events.find(
(e): e is AgentEvent<'error'> =>
e.type === 'error' && e._meta?.['code'] === 'LOOP_DETECTED',
);
expect(warning).toBeDefined();
expect(warning?.fatal).toBe(false);
// Stream should have continued — content after loop detected
const messages = events.filter(
(e): e is AgentEvent<'message'> =>
e.type === 'message' && e.role === 'agent',
);
expect(
messages.some(
(m) =>
m.content[0]?.type === 'text' &&
m.content[0].text === 'continuing after loop',
),
).toBe(true);
// Should still end with agent_end completed
const streamEnd = events.find(
(e): e is AgentEvent<'agent_end'> => e.type === 'agent_end',
);
expect(streamEnd?.reason).toBe('completed');
});
});
describe('stream - max turns', () => {
it('emits agent_end with max_turns when the session turn limit is exceeded', async () => {
const configMock = deps.config.getMaxSessionTurns as ReturnType<
typeof vi.fn
>;
configMock.mockReturnValue(0);
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([
{ type: GeminiEventType.Content, value: 'should not be reached' },
]),
);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
const streamEnd = events.find(
(e): e is AgentEvent<'agent_end'> => e.type === 'agent_end',
);
expect(streamEnd?.reason).toBe('max_turns');
expect(streamEnd?.data).toEqual({
code: 'MAX_TURNS_EXCEEDED',
maxTurns: 0,
turnCount: 0,
});
expect(sendMock).not.toHaveBeenCalled();
});
it('treats GeminiClient MaxSessionTurns as a terminal max_turns stream end', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([{ type: GeminiEventType.MaxSessionTurns }]),
);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
const errorEvents = events.filter(
(e): e is AgentEvent<'error'> => e.type === 'error',
);
expect(errorEvents).toHaveLength(0);
const streamEnd = events.findLast(
(e): e is AgentEvent<'agent_end'> => e.type === 'agent_end',
);
expect(streamEnd?.reason).toBe('max_turns');
expect(streamEnd?.data).toEqual({
code: 'MAX_TURNS_EXCEEDED',
});
});
});
describe('abort', () => {
it('treats abort before the first model event as aborted without fatal error', async () => {
let releaseAbort: (() => void) | undefined;
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
(async function* () {
await new Promise<void>((resolve) => {
releaseAbort = resolve;
});
yield* [];
const abortError = new Error('Aborted');
abortError.name = 'AbortError';
throw abortError;
})(),
);
const session = new LegacyAgentSession(deps);
const { streamId } = await session.send(makeMessageSend('hi'));
await vi.advanceTimersByTimeAsync(0);
await session.abort();
releaseAbort?.();
const events = await collectEvents(session, {
streamId: streamId ?? undefined,
});
expect(
events.some(
(event): event is AgentEvent<'error'> =>
event.type === 'error' && event.fatal,
),
).toBe(false);
const streamEnd = events.findLast(
(event): event is AgentEvent<'agent_end'> => event.type === 'agent_end',
);
expect(streamEnd?.reason).toBe('aborted');
});
it('aborts the stream', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
// Stream that yields content then checks abort signal via a deferred
let resolveHang: (() => void) | undefined;
sendMock.mockReturnValue(
(async function* () {
yield {
type: GeminiEventType.Content,
value: 'start',
} as ServerGeminiStreamEvent;
// Wait until externally resolved (by abort)
await new Promise<void>((resolve) => {
resolveHang = resolve;
});
yield {
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
} as ServerGeminiStreamEvent;
})(),
);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
// Give the loop time to start processing
await new Promise((r) => setTimeout(r, 50));
// Abort and resolve the hang so the generator can finish
await session.abort();
resolveHang?.();
// Collect all events
const events = await collectEvents(session);
const streamEnd = events.find(
(e): e is AgentEvent<'agent_end'> => e.type === 'agent_end',
);
expect(streamEnd?.reason).toBe('aborted');
});
it('treats abort during pending scheduler work as aborted without fatal error', async () => {
let resolveSchedule: ((value: CompletedToolCall[]) => void) | undefined;
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([
{
type: GeminiEventType.ToolCallRequest,
value: makeToolRequest('call-1', 'slow_tool'),
},
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const scheduleMock = deps.scheduler.schedule as ReturnType<typeof vi.fn>;
scheduleMock.mockReturnValue(
new Promise<CompletedToolCall[]>((resolve) => {
resolveSchedule = resolve;
}),
);
const session = new LegacyAgentSession(deps);
const { streamId } = await session.send(makeMessageSend('hi'));
await new Promise((resolve) => setTimeout(resolve, 25));
await session.abort();
resolveSchedule?.([makeCompletedToolCall('call-1', 'slow_tool', 'done')]);
const events = await collectEvents(session, {
streamId: streamId ?? undefined,
});
expect(
events.some(
(event): event is AgentEvent<'error'> =>
event.type === 'error' && event.fatal,
),
).toBe(false);
expect(events.some((event) => event.type === 'tool_response')).toBe(
false,
);
const streamEnd = events.findLast(
(event): event is AgentEvent<'agent_end'> => event.type === 'agent_end',
);
expect(streamEnd?.reason).toBe('aborted');
});
});
describe('events property', () => {
it('accumulates all events', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([
{ type: GeminiEventType.Content, value: 'hi' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
await collectEvents(session);
expect(session.events.length).toBeGreaterThan(0);
expect(session.events[0]?.type).toBe('message');
});
});
describe('subscription and stream scoping', () => {
it('subscribe receives live events for the next stream', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([
{ type: GeminiEventType.Content, value: 'hello later' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const session = new LegacyAgentSession(deps);
const liveEvents: AgentEvent[] = [];
const unsubscribe = session.subscribe((event) => {
liveEvents.push(event);
});
const { streamId } = await session.send(makeMessageSend('hi'));
await collectEvents(session, { streamId: streamId ?? undefined });
unsubscribe();
expect(liveEvents.length).toBeGreaterThan(0);
expect(liveEvents[0]?.type).toBe('message');
expect(liveEvents.every((event) => event.streamId === streamId)).toBe(
true,
);
});
it('subscribe is live-only and does not replay old history when idle', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock
.mockReturnValueOnce(
makeStream([
{ type: GeminiEventType.Content, value: 'first answer' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
)
.mockReturnValueOnce(
makeStream([
{ type: GeminiEventType.Content, value: 'second answer' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const session = new LegacyAgentSession(deps);
const first = await session.send(makeMessageSend('first request'));
await collectEvents(session, { streamId: first.streamId ?? undefined });
const liveEvents: AgentEvent[] = [];
const unsubscribe = session.subscribe((event) => {
liveEvents.push(event);
});
const second = await session.send(makeMessageSend('second request'));
await collectEvents(session, { streamId: second.streamId ?? undefined });
unsubscribe();
expect(liveEvents.length).toBeGreaterThan(0);
expect(
liveEvents.every((event) => event.streamId === second.streamId),
).toBe(true);
expect(
liveEvents.some(
(event) =>
event.type === 'message' &&
event.role === 'user' &&
event.content[0]?.type === 'text' &&
event.content[0].text === 'first request',
),
).toBe(false);
});
it('streams only the requested streamId', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock
.mockReturnValueOnce(
makeStream([
{ type: GeminiEventType.Content, value: 'first answer' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
)
.mockReturnValueOnce(
makeStream([
{ type: GeminiEventType.Content, value: 'second answer' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const session = new LegacyAgentSession(deps);
const first = await session.send(makeMessageSend('first request'));
await collectEvents(session, { streamId: first.streamId ?? undefined });
const second = await session.send(makeMessageSend('second request'));
await collectEvents(session, { streamId: second.streamId ?? undefined });
const firstStreamEvents = await collectEvents(session, {
streamId: first.streamId ?? undefined,
});
expect(
firstStreamEvents.every((event) => event.streamId === first.streamId),
).toBe(true);
expect(
firstStreamEvents.some(
(e) =>
e.type === 'message' &&
e.role === 'agent' &&
e.content[0]?.type === 'text' &&
e.content[0].text === 'first answer',
),
).toBe(true);
expect(
firstStreamEvents.some(
(e) =>
e.type === 'message' &&
e.role === 'agent' &&
e.content[0]?.type === 'text' &&
e.content[0].text === 'second answer',
),
).toBe(false);
});
it('resumes from eventId within the same stream only', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock
.mockReturnValueOnce(
makeStream([
{ type: GeminiEventType.Content, value: 'first answer' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
)
.mockReturnValueOnce(
makeStream([
{ type: GeminiEventType.Content, value: 'second answer' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const session = new LegacyAgentSession(deps);
const first = await session.send(makeMessageSend('first request'));
await collectEvents(session, { streamId: first.streamId ?? undefined });
await session.send(makeMessageSend('second request'));
await collectEvents(session);
const firstAgentMessage = session.events.find(
(e): e is AgentEvent<'message'> =>
e.type === 'message' &&
e.role === 'agent' &&
e.streamId === first.streamId &&
e.content[0]?.type === 'text' &&
e.content[0].text === 'first answer',
);
expect(firstAgentMessage).toBeDefined();
const resumedEvents = await collectEvents(session, {
eventId: firstAgentMessage?.id,
});
expect(
resumedEvents.every((event) => event.streamId === first.streamId),
).toBe(true);
expect(resumedEvents.map((event) => event.type)).toEqual(['agent_end']);
expect(
resumedEvents.some(
(e) =>
e.type === 'message' &&
e.role === 'agent' &&
e.content[0]?.type === 'text' &&
e.content[0].text === 'second answer',
),
).toBe(false);
});
});
describe('agent_end ordering', () => {
it('agent_end is always the final event yielded', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([
{ type: GeminiEventType.Content, value: 'Hello' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
expect(events.length).toBeGreaterThan(0);
expect(events[events.length - 1]?.type).toBe('agent_end');
});
it('agent_end is final even after error events', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValue(
makeStream([
{
type: GeminiEventType.Error,
value: { error: new Error('API error') },
},
]),
);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
expect(events[events.length - 1]?.type).toBe('agent_end');
});
});
describe('intermediate Finished events', () => {
it('does NOT emit agent_end when tool calls are pending', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
// First turn: tool request + Finished (should NOT produce agent_end)
sendMock.mockReturnValueOnce(
makeStream([
{
type: GeminiEventType.ToolCallRequest,
value: makeToolRequest('call-1', 'read_file'),
},
{
type: GeminiEventType.Finished,
value: {
reason: FinishReason.STOP,
usageMetadata: {
promptTokenCount: 50,
candidatesTokenCount: 20,
},
},
},
]),
);
// Second turn: final answer
sendMock.mockReturnValueOnce(
makeStream([
{ type: GeminiEventType.Content, value: 'Answer' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const scheduleMock = deps.scheduler.schedule as ReturnType<typeof vi.fn>;
scheduleMock.mockResolvedValueOnce([
makeCompletedToolCall('call-1', 'read_file', 'data'),
]);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('do it'));
const events = await collectEvents(session);
// Only one agent_end at the very end
const streamEnds = events.filter((e) => e.type === 'agent_end');
expect(streamEnds).toHaveLength(1);
expect(streamEnds[0]).toBe(events[events.length - 1]);
});
it('emits usage for intermediate Finished events', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockReturnValueOnce(
makeStream([
{
type: GeminiEventType.ToolCallRequest,
value: makeToolRequest('call-1', 'read_file'),
},
{
type: GeminiEventType.Finished,
value: {
reason: FinishReason.STOP,
usageMetadata: {
promptTokenCount: 100,
candidatesTokenCount: 30,
},
},
},
]),
);
sendMock.mockReturnValueOnce(
makeStream([
{ type: GeminiEventType.Content, value: 'Done' },
{
type: GeminiEventType.Finished,
value: { reason: FinishReason.STOP, usageMetadata: undefined },
},
]),
);
const scheduleMock = deps.scheduler.schedule as ReturnType<typeof vi.fn>;
scheduleMock.mockResolvedValueOnce([
makeCompletedToolCall('call-1', 'read_file', 'contents'),
]);
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('go'));
const events = await collectEvents(session);
// Should have at least one usage event from the intermediate Finished
const usageEvents = events.filter(
(e): e is AgentEvent<'usage'> => e.type === 'usage',
);
expect(usageEvents.length).toBeGreaterThanOrEqual(1);
expect(usageEvents[0]?.inputTokens).toBe(100);
expect(usageEvents[0]?.outputTokens).toBe(30);
});
});
describe('error handling in runLoop', () => {
it('catches thrown errors and emits error + agent_end', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
sendMock.mockImplementation(() => {
throw new Error('Connection refused');
});
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
const err = events.find(
(e): e is AgentEvent<'error'> => e.type === 'error',
);
expect(err?.message).toBe('Connection refused');
expect(err?.fatal).toBe(true);
expect(err?._meta?.['stack']).toBeDefined();
const streamEnd = events.find(
(e): e is AgentEvent<'agent_end'> => e.type === 'agent_end',
);
expect(streamEnd?.reason).toBe('failed');
});
});
describe('_emitErrorAndAgentEnd metadata', () => {
it('preserves exitCode and code in _meta for FatalError', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
// Simulate a FatalError being thrown
const { FatalError } = await import('../utils/errors.js');
sendMock.mockImplementation(() => {
throw new FatalError('Disk full', 44);
});
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
const err = events.find(
(e): e is AgentEvent<'error'> => e.type === 'error',
);
expect(err?.message).toBe('Disk full');
expect(err?.fatal).toBe(true);
expect(err?._meta?.['exitCode']).toBe(44);
expect(err?._meta?.['errorName']).toBe('FatalError');
});
it('preserves exitCode for non-FatalError errors that carry one', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
const exitCodeError = new Error('custom exit');
(exitCodeError as Error & { exitCode: number }).exitCode = 17;
sendMock.mockImplementation(() => {
throw exitCodeError;
});
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
const err = events.find(
(e): e is AgentEvent<'error'> => e.type === 'error',
);
expect(err?._meta?.['exitCode']).toBe(17);
});
it('preserves code in _meta for errors with code property', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
const codedError = new Error('ENOENT');
(codedError as Error & { code: string }).code = 'ENOENT';
sendMock.mockImplementation(() => {
throw codedError;
});
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
const err = events.find(
(e): e is AgentEvent<'error'> => e.type === 'error',
);
expect(err?._meta?.['code']).toBe('ENOENT');
});
it('preserves status in _meta for errors with status property', async () => {
const sendMock = deps.client.sendMessageStream as ReturnType<
typeof vi.fn
>;
const statusError = new Error('rate limited');
(statusError as Error & { status: string }).status = 'RESOURCE_EXHAUSTED';
sendMock.mockImplementation(() => {
throw statusError;
});
const session = new LegacyAgentSession(deps);
await session.send(makeMessageSend('hi'));
const events = await collectEvents(session);
const err = events.find(
(e): e is AgentEvent<'error'> => e.type === 'error',
);
expect(err?._meta?.['status']).toBe('RESOURCE_EXHAUSTED');
});
});
});
|