Overview
TestDriver uses EventEmitter2 for its event system. Events use a namespace pattern with colons. They permit wildcard listeners. Use the emitter throughtestdriver.emitter:
testdriver.emitter.on('command:start', (data) => {
console.log(`Running: ${data.command}`);
});
Configuration
The internal emitter is created with:new EventEmitter2({
wildcard: true,
delimiter: ':',
maxListeners: 20,
verboseMemoryLeak: false,
ignoreErrors: false,
});
Wildcard Listeners
Use* to match one level. Use ** to match many levels:
// Match all log events
testdriver.emitter.on('log:*', (message) => {
console.log(message);
});
// Match all events in any namespace
testdriver.emitter.on('**', (...args) => {
console.log('Event:', this.event, args);
});
Event Reference
Command Events
Emitted during the execution of SDK commands (click, type, find, etc.).
| Event | Payload |
|---|---|
command:start | { command, depth, data, timestamp, sourcePosition } |
command:success | { command, depth, data, duration, response, timestamp, sourcePosition } |
command:error | { command, depth, data, error, duration, timestamp, sourcePosition } |
command:status | { command, status: "executing", data, depth, timestamp } |
command:progress | { command, status: "completed", timing, data, depth, timestamp } |
testdriver.emitter.on('command:start', ({ command, data }) => {
console.log(`Starting ${command}`, data);
});
testdriver.emitter.on('command:error', ({ command, error, duration }) => {
console.error(`${command} failed after ${duration}ms: ${error}`);
});
Step Events
Emitted for each AI reasoning step within a command.| Event | Payload |
|---|---|
step:start | { stepIndex, prompt, commandCount, timestamp, sourcePosition } |
step:success | { stepIndex, prompt, commandCount, duration, timestamp, sourcePosition } |
step:error | { stepIndex, prompt, error, duration?, timestamp, sourcePosition? } |
testdriver.emitter.on('step:start', ({ stepIndex, prompt }) => {
console.log(`Step ${stepIndex}: ${prompt}`);
});
Test Events
Emitted when a test file execution starts.| Event | Payload |
|---|---|
test:start | { filePath, timestamp } |
test:success | Emitted on test completion |
test:error | Emitted on test failure |
Log Events
Emitted for all log output from the SDK.| Event | Payload |
|---|---|
log:log | (message: string) — general log message |
log:warn | (message: string) — warning message |
log:debug | (message: string) — debug output (only when VERBOSE/DEBUG/TD_DEBUG env set) |
log:info | (message: string) — informational message |
log:error | (message: string) — error message |
log:narration | (message: string, overwrite?: boolean) — in-place status line |
log:markdown | (markdown: string) — full static markdown content |
log:markdown:start | (streamId: string) — begin streaming markdown |
log:markdown:chunk | (streamId: string, chunk: string) — incremental chunk |
log:markdown:end | (streamId: string) — end streaming markdown |
// Capture all logs
testdriver.emitter.on('log:*', function (message) {
console.log(`[${this.event}]`, message);
});
Screen Capture Events
Emitted during screenshot capture.| Event | Payload |
|---|---|
screen-capture:start | { scale, silent, display } |
screen-capture:end | { scale, silent, display } |
screen-capture:error | { error, scale, silent, display } |
Sandbox Events
Emitted for sandbox WebSocket lifecycle and communication.| Event | Payload |
|---|---|
sandbox:connected | No payload — WebSocket connection established |
sandbox:authenticated | { traceId } — authentication successful |
sandbox:error | (err: Error | string) — connection or sandbox error |
sandbox:sent | (message: object) — WebSocket message sent |
sandbox:received | No payload — successful message reply received |
sandbox:progress | { step, message } — sandbox setup progress |
testdriver.emitter.on('sandbox:connected', () => {
console.log('Connected to sandbox');
});
testdriver.emitter.on('sandbox:progress', ({ step, message }) => {
console.log(`Sandbox: [${step}] ${message}`);
});
Redraw Events
Emitted during screen stability detection. See Redraw for more details.| Event | Payload |
|---|---|
redraw:status | { redraw: { enabled, settled, hasChangedFromInitial, consecutiveFramesStable, diffFromInitial, diffFromLast, text }, network: { enabled, settled, rxBytes, txBytes, text }, timeout: { isTimeout, elapsed, max, text } } |
redraw:complete | { screenSettled, hasChangedFromInitial, consecutiveFramesStable, networkSettled, isTimeout, timeElapsed } |
testdriver.emitter.on('redraw:complete', (result) => {
if (result.isTimeout) {
console.warn('Redraw timed out after', result.timeElapsed, 'ms');
}
});
File Events
Emitted during file load/save operations in the agent.| Event | Payload |
|---|---|
file:start | { operation: "load" | "save" | "run", filePath, timestamp } |
file:stop | { operation, filePath, duration, success, sourceMap?, reason?, timestamp } |
file:load | { filePath, size, timestamp } |
file:save | { filePath, size, timestamp } |
file:diff | { filePath, diff: { patches, sourceMaps, summary: { additions, deletions, modifications } }, timestamp } |
file:error | { operation, filePath, error, duration?, timestamp } |
Error Events
Emitted for errors at various severity levels.| Event | Payload |
|---|---|
error:fatal | (error: string | Error) — terminates the process |
error:general | (message: string) — non-fatal error |
error:sandbox | (err: Error | string) — sandbox/WebSocket error |
testdriver.emitter.on('error:*', function (err) {
console.error(`[${this.event}]`, err);
});
SDK Events
Emitted for API request lifecycle.| Event | Payload |
|---|---|
sdk:request | { path } — outgoing API request |
sdk:response | { path } — API response received |
sdk:retry | { path, attempt, error, delayMs } — request retry |
Other Events
| Event | Payload |
|---|---|
exit | (exitCode: number) — 0 for success, 1 for failure |
status | (message: string) — general status updates |
mouse-click | { x, y, button, click, double } — mouse click performed |
terminal:stdout | Terminal stdout output |
terminal:stderr | Terminal stderr output |
Practical Examples
Custom Test Reporter
const results = [];
testdriver.emitter.on('command:success', ({ command, duration }) => {
results.push({ command, duration, status: 'pass' });
});
testdriver.emitter.on('command:error', ({ command, duration, error }) => {
results.push({ command, duration, status: 'fail', error });
});
// After test completes
afterAll(() => {
console.table(results);
});
Progress Monitoring
testdriver.emitter.on('step:start', ({ stepIndex, prompt }) => {
process.stdout.write(`\r Step ${stepIndex}: ${prompt}`);
});
testdriver.emitter.on('command:progress', ({ command, timing }) => {
process.stdout.write(`\r ${command} completed in ${timing}ms`);
});
Debug Logging
// Log every event (verbose)
testdriver.emitter.on('**', function (...args) {
console.debug(`[EVENT] ${this.event}`, ...args);
});
Types
interface CommandStartEvent {
command: string;
depth: number;
data: Record<string, any>;
timestamp: number;
sourcePosition: SourcePosition;
}
interface CommandSuccessEvent {
command: string;
depth: number;
data: Record<string, any>;
duration: number;
response: any;
timestamp: number;
sourcePosition: SourcePosition;
}
interface CommandErrorEvent {
command: string;
depth: number;
data: Record<string, any>;
error: string;
duration: number;
timestamp: number;
sourcePosition: SourcePosition;
}
interface StepStartEvent {
stepIndex: number;
prompt: string;
commandCount: number;
timestamp: number;
sourcePosition: SourcePosition;
}
interface StepSuccessEvent {
stepIndex: number;
prompt: string;
commandCount: number;
duration: number;
timestamp: number;
sourcePosition: SourcePosition;
}
interface RedrawStatusEvent {
redraw: {
enabled: boolean;
settled: boolean;
hasChangedFromInitial: boolean;
consecutiveFramesStable: number;
diffFromInitial: number;
diffFromLast: number;
text: string;
};
network: {
enabled: boolean;
settled: boolean;
rxBytes: number;
txBytes: number;
text: string;
};
timeout: {
isTimeout: boolean;
elapsed: number;
max: number;
text: string;
};
}
interface RedrawCompleteEvent {
screenSettled: boolean;
hasChangedFromInitial: boolean;
consecutiveFramesStable: number;
networkSettled: boolean;
isTimeout: boolean;
timeElapsed: number;
}
interface SandboxProgressEvent {
step: string;
message: string;
}
interface SourcePosition {
file: string;
line: number;
column: number;
}