Testing

Testing

This project has 140 automated tests across all four services. Most run locally without a running cluster, database, or message broker — the one exception is OutboxRelayWorkerTests, which needs a real PostgreSQL via Testcontainers (Docker required), not a cluster or broker.

Quick start

# From the repo root: run everything
make test-unit

Or run each suite individually:

# .NET services
cd src
dotnet test order-api.Tests/order-api.Tests.csproj
dotnet test gateway-api.Tests/gateway-api.Tests.csproj

# Python service
cd src/notification-svc
python -m venv .venv && .venv/bin/pip install -r requirements-test.txt
.venv/bin/python -m pytest tests/ -v

# Angular frontend
cd src/frontend
npm ci --legacy-peer-deps   # jest/jest-preset-angular are real devDependencies now
npx jest --config jest.config.js

Test suites

order-api.Tests (30 tests)

Framework: xUnit 2.9, Moq 4.20, EF Core InMemory 8.0 (OrderGrpcServiceTests) + a real PostgreSQL via Testcontainers (OutboxRelayWorkerTests — see why below)

Location: src/order-api.Tests/

What it covers:

Test group	Count	Description
CreateOrder — validation	7	Zero/negative ProjectId; zero/negative/over-max Amount (3 cases); empty/over-500-char Description
CreateOrder — happy path	4	Persists to DB, writes outbox entry, boundary amounts (0.01 and 999,999.99)
CreateOrder — idempotency key	3	Repeated key replays the original order (no duplicate row), different keys create separate orders, no key allows multiple orders (OrderGrpcServiceTests.cs)
GetOrder	2	Found (returns all fields), not found (StatusCode.NotFound)
GetOrdersByProject	4	Returns matching rows only, returns empty stream when no rows exist, zero/negative ProjectId → InvalidArgument (2 cases)
OutboxRelayWorkerTests	8	Publishes + marks processed, payload contains order ID, no-op when queue empty, publisher failure leaves message unprocessed, already-processed message skipped, traceparent forwarded, two concurrent replicas only publish each message once, outbox.relay shares the original request’s trace ID (OutboxRelayWorkerTests.cs)
OrderPublisherTests	2	Real broker (Testcontainers RabbitMQ): message arrives with traceparent header intact when present, publishes without the header when absent (OrderPublisherTests.cs)

Key test utilities:

• TestServerCallContext — minimal ServerCallContext implementation for passing to gRPC service methods
• FakeServerStreamWriter<T> — collects Written messages in-memory for assertion on streaming RPCs

Infrastructure isolation: OrderGrpcServiceTests uses EF Core InMemory (unique DB name per test); IOrderPublisher is mocked via Moq throughout. OutboxRelayWorkerTests exercises the transactional outbox relay against a real postgres:16.4 container via Testcontainers instead — InMemory doesn’t support transactions or raw SQL, and the worker’s multi-replica-safe row claiming (FOR UPDATE SKIP LOCKED) needs both to be exercised for real, not simulated. One container is shared across the test class; each test gets a fresh schema via EnsureDeleted/EnsureCreated in IAsyncLifetime.InitializeAsync. Requires Docker.

dotnet test src/order-api.Tests/order-api.Tests.csproj
# Passed: 30, Failed: 0

---

gateway-api.Tests (27 test methods, 29 executions)

Framework: xUnit 2.9, Moq 4.20, EF Core InMemory 8.0, Microsoft.AspNetCore.Mvc.Testing 8.0

Location: src/gateway-api.Tests/

What it covers:

Test group	Count	Description
GET /api/projects	2	Empty list, list with data
GET /api/projects/:id	2	Found (200), not found (404)
POST /api/projects	2	Creates project, persists to DB
DELETE /api/projects/:id	2	Found (204), not found (404)
GET /api/projects/:id/orders	4	gRPC streaming proxy success, and status mapping for Unavailable→503, InvalidArgument→400, Internal→502
POST /api/orders — validation	7	Zero/negative projectId, invalid amounts (3 cases, one [Theory]), empty/long description
POST /api/orders — happy path	3	201 with {id, status}, 502 on generic gRPC failure, 400 on gRPC InvalidArgument
GET /api/orders/:id	3	Found (200), not found (404), 503 on gRPC Unavailable — completes the passthrough CreateOrder’s Location header points at
GET /api/notifications	3	Downstream 200 (proxies body), downstream 502, downstream 4xx passed through as-is
GET /healthz	1	Returns {"status":"healthy"}

Key test infrastructure — CustomWebApplicationFactory:

• Replaces MySQL (DbContextOptions<AppDbContext>) with EF Core InMemory using a fixed DB name captured outside the lambda (ensures all DI scopes share one store)
• Replaces OrderService.OrderServiceClient with a Moq mock (MockOrderClient)
• Replaces IHttpClientFactory with a Moq mock (MockHttpClientFactory) for notification-svc proxy isolation
• Uses builder.UseSetting() to inject ConnectionStrings:DefaultConnection before startup validation fires

dotnet test src/gateway-api.Tests/gateway-api.Tests.csproj
# Passed: 29, Failed: 0

---

notification-svc tests (27 tests)

Framework: pytest 8.3, fakeredis 2.23, httpx 0.27

Location: src/notification-svc/tests/

Setup:

cd src/notification-svc
python -m venv .venv
.venv/bin/pip install -r requirements-test.txt
.venv/bin/python -m pytest tests/ -v

Note: The active shell Python may point to a different project’s venv. Always run tests via .venv/bin/python to use the correct environment.

What it covers:

Test group	Count	Description
test_routes.py — health	1	GET /healthz returns {"status":"healthy"}
test_routes.py — readiness	3	Ready when consumer connected + Redis reachable, not-ready when consumer disconnected, not-ready when Redis unreachable (/readyz)
test_routes.py — notifications	5	Empty list, stored items returned, 100-item limit, get by ID found/not-found
test_consumer.py — happy path	6	ACKs message, stores hash, pushes to list, sets dedup TTL, sets notification TTL, increments counter
test_consumer.py — deduplication	3	Skips duplicate, sets notification.duplicate span attribute, increments duplicate counter
test_consumer.py — dedup atomicity	2	Dedup uses a single atomic SET ... NX (not exists()+set()), second of two rapid deliveries is deduped
test_consumer.py — reprocessing	1	Reprocessing the same order (after TTL drift) doesn’t push a duplicate notification_ids list entry (LREM before LPUSH)
test_consumer.py — error handling	5	Invalid JSON → NACK to DLQ, increments failed counter, Redis error → NACK with requeue (transient, not DLQ’d), increments failed_transient counter, unexpected error → NACK to DLQ
test_consumer.py — list capping	1	List trimmed to 1000 entries

Infrastructure isolation:

• fakeredis.FakeRedis(decode_responses=True) replaces the real Redis client
• unittest.mock.patch("app.main._consumer_loop") prevents the RabbitMQ consumer thread from starting
• app.telemetry is stubbed in conftest.py via sys.modules before any app module is imported — this prevents the opentelemetry-exporter-otlp-proto-grpc protobuf C extensions from loading (incompatible with Python 3.14’s metaclass changes); tests use the real OTel no-op TracerProvider for span operations

.venv/bin/python -m pytest tests/ -v
# 27 passed

---

Frontend tests (54 tests)

Framework: Jest 29.7, jest-preset-angular 14.6, jsdom

Location: src/frontend/src/app/

Setup:

jest, jest-preset-angular, jest-environment-jsdom, and @types/jest are real, pinned devDependencies in package.json — installed into src/frontend/node_modules like everything else:

cd src/frontend
npm ci --legacy-peer-deps   # or: npm install
npx jest --config jest.config.js

--legacy-peer-deps is needed because @angular-devkit/build-angular and jest-preset-angular declare overlapping-but-not-identical Angular peer ranges; both are satisfied in practice.

If node_modules ends up root-owned (e.g. from an npm ci run inside a bind-mounted Docker container), npm ci fails loudly with EACCES rather than silently misbehaving. Fix with sudo chown -R $USER:$USER src/frontend/node_modules and re-run.

Formerly: this project installed Jest ad hoc into a separate /tmp/ng-test-deps prefix (worked around root-owned node_modules) and referenced it via NODE_PATH. That split install was the actual root cause of a real breakage, not just a theoretical risk: jest-preset-angular’s own require() calls resolved typescript from its own prefix’s node_modules first — an unpinned install there could land a typescript major ahead of this project’s pinned ~5.4.2 (observed: 6.0.3) and/or a jest-preset-angular major requiring a newer Angular than this project pins, and either one broke Ivy’s DI factory generation with a bare NG0202 at every TestBed.inject() call — no code change on either side. Colocating everything in one node_modules (this section, now) removes the cross-resolution ambiguity entirely: npm ci installs versions declared and locked in this project’s own package.json/package-lock.json.

What it covers (by spec file):

Spec file	Count	Covers
api.service.spec.ts	11	ApiService — projects/orders/notifications CRUD + error propagation, window.__ENV.API_BASE_URL wins over environment.apiBaseUrl when set (2 cases)
dashboard.component.spec.ts	9	Init, list rendering, loading/error/empty states, project mutations
error-test.component.spec.ts	6	/api/error and /api/slow demo endpoints
create-order.component.spec.ts	8	Order creation form validation and submission
project-detail.component.spec.ts	8	Project detail view, order list for a project
notifications.component.spec.ts	8	Notifications list rendering and polling
faro.spec.ts	4	scrubTelemetryItem — redacts emails from string fields, leaves non-string fields untouched, ignores non-matching items

Infrastructure isolation: HttpClientTestingModule + HttpTestingController intercept all HTTP calls; ApiService is mocked via jest.Mocked<ApiService> in component tests.

npx jest --config jest.config.js
# 54 passed

---

integration-tests (1 test, opt-in)

Framework: xUnit 2.9, Testcontainers 4.13 (base + .PostgreSql + .RabbitMq)

Location: src/integration-tests/

Not part of the fast default suite — needs Docker to build order-api and notification-svc from their real Dockerfiles (not project references) and run six containers (Postgres, RabbitMQ, Redis, Jaeger, order-api, notification-svc). Expect ~1.5-2 minutes: mostly the two image builds, since Testcontainers can’t reuse deploy-local.sh’s image cache. Marked [Trait("Category", "Integration")]; there’s no .sln in this repo so it’s never picked up by the four project-scoped dotnet test commands above — it only runs when invoked directly:

dotnet test src/integration-tests/integration-tests.csproj

What it covers: the full cross-language 5-hop trace, for real — a genuine gRPC CreateOrder call against a real order-api (real Postgres) publishes to a real RabbitMQ, a real Python notification-svc consumes it (real Redis), and the resulting Jaeger trace is queried via its HTTP API to assert order.create, outbox.relay, order.publish, and notification.process all share one trace ID. This test is what surfaced three real bugs during this session, none of which were visible from the mocked unit suites above:

• order-api’s gRPC port never actually worked over plain HTTP. A single Kestrel endpoint configured for mixed HTTP/1.1+HTTP/2 without TLS silently downgrades every connection to HTTP/1.1 (Kestrel logs “HTTP/2 requires TLS application protocol negotiation”), so gRPC’s HTTP/2 prior-knowledge preface got rejected with HTTP_1_1_REQUIRED. Fixed by splitting order-api onto two dedicated ports — 5001 HTTP/1.1-only for kubelet’s /healthz, 5002 HTTP/2-only for gRPC (see Program.cs’s “gRPC server” comment). Confirmed via a from-scratch, no-Docker, no-k8s repro before touching any production code.
• OutboxRelayWorker’s explicit transaction was incompatible with EnableRetryOnFailure(). A bare Database.BeginTransactionAsync() under a registered retrying execution strategy throws InvalidOperationException on every call — meaning every outbox poll cycle failed silently (caught by the worker’s own retry-logging catch block) since EnableRetryOnFailure() was added earlier in the same review-remediation pass. Fixed by wrapping the transaction in Database.CreateExecutionStrategy().ExecuteAsync(...).
• The outbox.relay/order.publish disconnected-trace gap this test was originally written to verify — see OutboxRelayWorker.PublishAndMarkAsync’s ActivityLink fix and OrderPublisher.cs’s updated header-comment trace diagram.

dotnet test src/integration-tests/integration-tests.csproj
# Passed: 1, Failed: 0

---

Coverage summary

Service	Tests	Frameworks	DB/IO isolation
order-api	30	xUnit, Moq	EF InMemory + Testcontainers (real Postgres, RabbitMQ)
gateway-api	29	xUnit, Moq, WebApplicationFactory	EF InMemory, Moq gRPC/HTTP
notification-svc	27	pytest, fakeredis	fakeredis, patched consumer
frontend	54	Jest, jest-preset-angular	HttpTestingController, jest mocks
Total	140

What is not covered

Gap	Reason
Proto schema contract tests	No schema registry in the lab; drift between gateway-api and order-api would only surface at runtime
RabbitMQ consumer backpressure	Requires a real broker; out of scope for unit tests
Concurrent idempotency-key race	The CreateOrder idempotency fast-path (OrderGrpcService.cs) is unit-tested for sequential retries; genuinely concurrent duplicate submissions rely on the DB unique index as an untested-here backstop
End-to-end trace propagation	Automated by src/integration-tests (opt-in, needs Docker — see above); also validated manually via Jaeger UI (docs/spec.md checklist) for exploratory checks
Load / performance	kubectl apply -f k8s/loadtest/ for cluster-level load generation