Network Testing

AgentEnsemble provides test doubles for NetworkTask and NetworkTool so you can test ensembles in isolation without real WebSocket connections.

Stubs

Stubs return a canned response on every invocation. Use them when you need predictable behavior from a remote capability:

// Stub a task
StubNetworkTask mealStub = NetworkTask.stub("kitchen", "prepare-meal",
    "Meal prepared: wagyu steak, medium-rare. Estimated 25 minutes.");

// Stub a tool
StubNetworkTool inventoryStub = NetworkTool.stub("kitchen", "check-inventory",
    "3 portions available");

// Use in an ensemble
Ensemble roomService = Ensemble.builder()
    .chatLanguageModel(model)
    .task(Task.builder()
        .description("Handle room service request")
        .tools(mealStub, inventoryStub)
        .build())
    .build();

EnsembleOutput result = roomService.run();

Recordings

Recordings capture every request for later assertion. Use them to verify what your ensemble sends to remote capabilities:

RecordingNetworkTask recorder = NetworkTask.recording("kitchen", "prepare-meal");

Ensemble roomService = Ensemble.builder()
    .chatLanguageModel(model)
    .task(Task.builder()
        .description("Handle room service request")
        .tools(recorder)
        .build())
    .build();

roomService.run();

// Assert what was sent
assertThat(recorder.callCount()).isEqualTo(1);
assertThat(recorder.lastRequest()).contains("wagyu");
assertThat(recorder.requests()).hasSize(1);

Custom default response

By default, recordings return "recorded". You can provide a custom response:

RecordingNetworkTask recorder = NetworkTask.recording("kitchen", "prepare-meal",
    "Meal prepared in 25 minutes");

Tool naming

Both stubs and recordings use the same name() format as real network tools: "ensemble.capability" (e.g., "kitchen.prepare-meal").

Thread safety

All test doubles are thread-safe. RecordingNetworkTask and RecordingNetworkTool use CopyOnWriteArrayList internally, so concurrent calls from parallel tool execution are safely recorded.

API Reference

StubNetworkTask / StubNetworkTool

Method	Description
`execute(input)`	Returns the canned response as `ToolResult.success()`
`name()`	Returns `"ensemble.task"` format
`ensembleName()`	The configured ensemble name
`taskName()` / `toolName()`	The configured task/tool name
`cannedResponse()` / `cannedResult()`	The configured canned response

RecordingNetworkTask / RecordingNetworkTool

Method	Description
`execute(input)`	Records the input and returns the default response
`callCount()`	Number of times invoked
`lastRequest()`	Most recent input (throws if none)
`requests()`	Immutable list of all inputs
`name()`	Returns `"ensemble.task"` format