Dogfooding: Test Coverage Matrix

The agent team runs 72 E2E tests across 8 test modules (79 with optional transports and signing). All tests pass in ~2.5 seconds.

Tests 1-10: Core Paths (`basic.rs`)

#	Test	Transport	What it exercises
1	sync-jsonrpc-send	JSON-RPC	Synchronous `SendMessage`, artifact count
2	streaming-jsonrpc	JSON-RPC	SSE streaming, event ordering, artifact metadata
3	sync-rest-send	REST	REST synchronous path
4	streaming-rest	REST	REST SSE streaming
5	build-failure-path	REST	`TaskState::Failed` lifecycle
6	get-task	JSON-RPC	`GetTask` retrieval by ID
7	list-tasks	JSON-RPC	`ListTasks` with pagination token
8	push-config-crud	REST	Push config create/get/list/delete/verify lifecycle
9	multi-part-message	JSON-RPC	Text + data parts, HealthMonitor agent-to-agent
10	agent-to-agent	REST	Coordinator delegates to CodeAnalyzer

Tests 11-20: Lifecycle (`lifecycle.rs`)

#	Test	Transport	What it exercises
11	full-orchestration	REST	Coordinator -> CodeAnalyzer + BuildMonitor fan-out
12	health-orchestration	REST	Coordinator -> HealthMonitor -> all agents (3-level)
13	message-metadata	JSON-RPC	Request metadata passthrough
14	cancel-task	REST	Mid-stream cancellation via `CancelTask`
15	get-nonexistent-task	JSON-RPC	Error: `TaskNotFound` (-32001)
16	pagination-walk	JSON-RPC	`ListTasks` page_size=1, no duplicates
17	agent-card-discovery	REST	`resolve_agent_card` on REST endpoint
18	agent-card-jsonrpc	JSON-RPC	`resolve_agent_card` on JSON-RPC endpoint
19	push-not-supported	JSON-RPC	Error: `NotSupported` (-32003) for no-push agent
20	cancel-completed	REST	Error: `InvalidState` for completed task cancel

Tests 21-30: Edge Cases (`edge_cases.rs`)

#	Test	Transport	What it exercises
21	cancel-nonexistent	REST	Error: `TaskNotFound` for fake task ID
22	return-immediately	REST	`return_immediately` client config propagation
23	concurrent-requests	JSON-RPC	5 parallel requests to same agent
24	empty-parts-rejected	JSON-RPC	Validation: empty message parts
25	get-task-rest	REST	`GetTask` via REST transport
26	list-tasks-rest	REST	`ListTasks` via REST transport
27	push-crud-jsonrpc	JSON-RPC	Push config CRUD via JSON-RPC (HealthMonitor)
28	resubscribe-rest	REST	`SubscribeToTask` concurrent resubscription
29	metrics-nonzero	—	All 4 agents have non-zero request counts
30	error-metrics-tracked	JSON-RPC	Error metric increments on invalid request

Tests 31-40: Stress & Durability (`stress.rs`)

#	Test	Transport	What it exercises
31	high-concurrency	JSON-RPC	20 parallel requests to same agent
32	mixed-transport	Both	REST + JSON-RPC simultaneously
33	context-continuation	JSON-RPC	Two messages with same `context_id`
34	large-payload	JSON-RPC	64KB text payload processing
35	stream-with-get-task	REST	`GetTask` during active SSE stream
36	push-delivery-e2e	REST	Push config set during streaming task
37	list-status-filter	JSON-RPC	`ListTasks` with `TaskState::Completed` filter
38	store-durability	JSON-RPC	Create 5 tasks, retrieve all 5
39	queue-depth-metrics	—	Cumulative metrics tracking (>20 total requests)
40	event-ordering	JSON-RPC	Working -> artifacts -> Completed sequence

Tests 41-50: SDK Dogfood Regressions (`dogfood.rs`)

#	Test	Transport	What it exercises
41	card-url-correct	JSON-RPC	Agent card URL matches actual bound address
42	card-skills-valid	Both	All 4 agent cards have name, description, version, skills, interface
43	push-list-regression	JSON-RPC	`ListTaskPushNotificationConfigs` via JSON-RPC (regression for bug 11)
44	push-event-classify	REST	Webhook event classifier uses correct field names
45	resubscribe-jsonrpc	JSON-RPC	`SubscribeToTask` via JSON-RPC transport
46	multiple-artifacts	JSON-RPC	Multiple artifacts per task (>=2)
47	concurrent-streams	REST	5 parallel SSE streams on same agent
48	list-context-filter	JSON-RPC	`ListTasks` with `context_id` filter
49	file-parts	JSON-RPC	`Part::file_bytes` with base64 content
50	history-length	JSON-RPC	`history_length` configuration via builder

Tests 51-58: WebSocket, Multi-Tenancy & gRPC (`transport.rs`)

#	Test	Transport	What it exercises
51	ws-send-message	WebSocket	JSON-RPC `SendMessage` over WebSocket (feature-gated)
52	ws-streaming	WebSocket	`SendStreamingMessage` with multi-frame streaming (feature-gated)
53	tenant-isolation	JSON-RPC	Different tenants cannot see each other's tasks
54	tenant-id-independence	Direct store	Same task ID in different tenants doesn't collide
55	tenant-count	Direct store	`TenantAwareInMemoryTaskStore::tenant_count()` tracking
56	grpc-send-message	gRPC	JSON-RPC `SendMessage` over gRPC transport (feature-gated)
57	grpc-streaming	gRPC	`SendStreamingMessage` over gRPC transport (feature-gated)
58	grpc-get-task	gRPC	`GetTask` after `SendMessage` over gRPC (feature-gated)

Note: Tests 51-52 require the websocket feature flag: cargo run -p agent-team --features websocket Tests 56-58 require the grpc feature flag: cargo run -p agent-team --features grpc

Tests 61-79: E2E Coverage Gaps (`coverage_gaps.rs`)

#	Test	Category	What it exercises
61	batch-single-element	Batch JSON-RPC	Single-element batch `[{...}]` with `SendMessage`
62	batch-multi-request	Batch JSON-RPC	Multi-request batch: `SendMessage` + `GetTask`
63	batch-empty	Batch JSON-RPC	Empty batch `[]` returns parse error
64	batch-mixed	Batch JSON-RPC	Mixed valid/invalid requests in batch
65	batch-streaming-rejected	Batch JSON-RPC	`SendStreamingMessage` in batch returns error
66	batch-subscribe-rejected	Batch JSON-RPC	`SubscribeToTask` in batch returns error
67	real-auth-rejection	Auth	Interceptor rejects unauthenticated requests
68	extended-agent-card	Cards	`GetExtendedAgentCard` via JSON-RPC
69	dynamic-agent-card	Cards	`DynamicAgentCardHandler` runtime card generation
70	agent-card-caching	Caching	ETag, `If-None-Match`, 304 Not Modified
71	backpressure-lagged	Streaming	Slow reader skips lagged events (capacity=2)
72	push-global-limit	Push config	Global push config limit enforcement (DoS prevention)
73	webhook-url-scheme	Push config	Rejects non-HTTP webhook URL schemes (ftp://, file://)
74	combined-filter	ListTasks	Combined status + context_id filtering
75	latency-metrics	Metrics	Verifies `on_request()` callback fires
76	timeout-retryable	Retry	Timeout errors are classified as retryable
77	concurrent-cancels	Stress	10 parallel cancel requests on same task
78	stale-page-token	Pagination	Graceful handling of invalid page tokens
79	agent-card-signing	Signing	ES256 key generation, JWS sign/verify, tamper detection (`signing` feature)

Coverage by SDK Feature

SDK Feature	Tests exercising it
`AgentExecutor` trait	1-5, 9-14, 22, 31-36, 38, 40, 46, 49, 51-52
JSON-RPC dispatch	1-2, 6-7, 9, 13, 15-16, 18-19, 23-24, 27, 29-34, 37-43, 45-46, 48-50, 53
REST dispatch	3-5, 8, 10-12, 14, 17, 20-22, 25-26, 28, 32, 35-36, 44, 47
WebSocket dispatch	51, 52
SSE streaming	2, 4, 14, 28, 35-36, 40, 44, 45, 47
WebSocket streaming	52
`GetTask`	6, 14, 25, 35
`ListTasks` + pagination	7, 16, 26, 37, 48, 50
`CancelTask`	14, 20, 21
Push config CRUD	8, 19, 27, 36, 43
Agent card discovery	17, 18, 41, 42
`ServerInterceptor`	All tests (audit interceptor on every agent)
`Metrics` hooks	29, 30, 39
`return_immediately`	22
`CancellationToken`	14
Error handling	15, 19, 20, 21, 24, 30
Multi-agent orchestration	10, 11, 12
Concurrent requests	23, 31, 32, 47
`SubscribeToTask` resubscribe	28, 45
Multiple artifacts	46
File parts (binary)	49
History length config	50
Context ID filtering	33, 48
Multi-tenancy	53, 54, 55
`TenantAwareInMemoryTaskStore`	53, 54, 55
`TenantContext::scope`	54, 55
Batch JSON-RPC	61, 62, 63, 64, 65, 66
Auth rejection (interceptor)	67
`GetExtendedAgentCard`	68
`DynamicAgentCardHandler`	69
Agent card HTTP caching (ETag/304)	70
Agent card signing (JWS/ES256)	79
Backpressure / `Lagged` events	71
Push config global limit	72
Webhook URL scheme validation	73
Combined status+context filter	74
`Metrics` callbacks	29, 30, 39, 75
Timeout retryability (Bug #32)	76
Concurrent cancel stress	77
Stale page token handling	78
Agent card signing (JWS/ES256)	79

Dedicated Integration Tests (Outside Agent-Team)

In addition to the 72 agent-team E2E tests (79 with optional transports and signing), the SDK includes dedicated integration test suites:

Suite	Location	Tests	What it covers
TLS/mTLS	`crates/a2a-client/tests/tls_integration_tests.rs`	7	Client cert validation, SNI hostname verification, unknown CA rejection, mutual TLS
WebSocket server	`crates/a2a-server/tests/websocket_tests.rs`	7	Send/stream, error handling, ping/pong, connection reuse, close frames
Memory & load stress	`crates/a2a-server/tests/stress_tests.rs`	5	200 concurrent requests, sustained load (500 requests/10 waves), eviction under load, multi-tenant isolation (10×50), rapid connect/disconnect

Features NOT Covered by E2E Tests

All previously uncovered features now have E2E test coverage. Agent card signing is covered by test 79 (#[cfg(feature = "signing")]).

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