feat: add Dapr.IntegrationTest.DaprClient integration tests for HTTP and gRPC proxy invocation

[Copilot]

Summary

Creates Dapr.IntegrationTest.DaprClient — a new integration test project that covers the legacy Dapr.Client service-invocation surface area against a real Dapr sidecar. This closes the gap identified in the previous analysis where HTTP service invocation and gRPC proxy tests existed only in the older Dapr.E2E.Test suite (which runs against a locally-installed dapr CLI) and not yet in the modern container-based Dapr.IntegrationTest.* suite.

Changes

src/Dapr.Testcontainers — library extensions

File	Change
Common/Options/DaprRuntimeOptions.cs	Added AppProtocol property (default "http") and validated WithAppProtocol() fluent setter
Containers/Dapr/DaprdContainer.cs	Forwards options.AppProtocol as -app-protocol on the daprd command line
Harnesses/BaseHarness.cs	Exposed public string AppId so tests can discover the auto-generated app-id for routing
Harnesses/ServiceInvocationHarness.cs (new)	Zero-infrastructure harness (no Redis / RabbitMQ) for HTTP and gRPC proxy tests
Common/DaprHarnessBuilder.cs	Added BuildServiceInvocation() factory method

test/Dapr.IntegrationTest.DaprClient — new test project

Auto-discovered by CI via the Dapr.IntegrationTest.*.csproj glob. Builds on net8.0 / net9.0 / net10.0.

File	Purpose
Dapr.IntegrationTest.DaprClient.csproj	SDK.Web project, references Dapr.Client + Dapr.Testcontainers + Grpc.AspNetCore + Grpc.Tools
Protos/echo.proto	Simple EchoService (unary, bidirectional streaming, slow-echo)
GrpcServices/EchoServiceImpl.cs	In-process gRPC service implementation
ServiceInvocation/HttpServiceInvocationTests.cs	Covers CreateInvokeHttpClient, CreateInvokableHttpClient, and three InvokeMethodAsync overloads
ServiceInvocation/GrpcProxyInvocationTests.cs	Covers unary gRPC proxy call, bidirectional streaming, and deadline-exceeded behaviour

Test coverage added

HTTP service invocation (HttpServiceInvocationTests)

• CreateInvokeHttpClient — POST with typed payload; GET request
• CreateInvokableHttpClient (instance method) — relative URI routed through sidecar
• InvokeMethodAsync<TRequest, TResponse> — typed request + typed response
• InvokeMethodAsync<TResponse> — no request body, typed response
• InvokeMethodAsync<TRequest> — typed request, void (204) response

gRPC proxy invocation (GrpcProxyInvocationTests)

• Unary call succeeds end-to-end through the Dapr sidecar
• Bidirectional streaming echoes all sent messages back in order
• Past-deadline call raises RpcException with StatusCode.DeadlineExceeded

How it works

Each test spins up its own ServiceInvocationHarness via DaprHarnessBuilder. For HTTP tests the harness uses the default --app-protocol http; for gRPC proxy tests WithOptions(new DaprRuntimeOptions().WithAppProtocol("grpc")) is passed so daprd uses gRPC to talk to the in-process Kestrel server (configured for HTTP/2 cleartext). No external infrastructure (Redis, RabbitMQ, etc.) is needed.

Notes

• The [Obsolete] attribute on test methods is the standard pattern in this repo for suppressing CS0618 when testing deprecated APIs (matches DaprClientTest.InvokeMethodAsync.cs etc.)
• The legacy Dapr.E2E.Test service-invocation tests are left untouched for now; they can be retired once this suite is stable in CI

[codecov]

Codecov Report

❌ Patch coverage is 13.33333% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.34%. Comparing base (85f94fa) to head (3584c25).

Files with missing lines	Patch %	Lines
...estcontainers/Common/Options/DaprRuntimeOptions.cs	12.50%	7 Missing ⚠️
...stcontainers/Harnesses/ServiceInvocationHarness.cs	0.00%	4 Missing ⚠️
...c/Dapr.Testcontainers/Common/DaprHarnessBuilder.cs	0.00%	1 Missing ⚠️
src/Dapr.Testcontainers/Harnesses/BaseHarness.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1814      +/-   ##
==========================================
- Coverage   65.42%   65.34%   -0.08%     
==========================================
  Files         296      297       +1     
  Lines        8694     8709      +15     
  Branches     1009     1010       +1     
==========================================
+ Hits         5688     5691       +3     
- Misses       2761     2774      +13     
+ Partials      245      244       -1     

Flag	Coverage Δ
net10.0	65.33% <13.33%> (-0.08%)	⬇️

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