TPT-4463: Add integration tests for RDMA interfaces

[mawilk90]

📝 Description

Integration tests for RDMA interfaces

Notes:

1. DevCloud tests may fail in CI because RDMA functionality is available on DevCloud only at the moment

✔️ How to Test

Some local setup is needed before RDMA tests run.

RDMA integration tests:

• DevCloud:
  make fixtures TEST_ARGS="-run TestVPC_WithRDMAType"
make fixtures TEST_ARGS="-run TestVPC_Subnet_WithRDMAType"
make fixtures TEST_ARGS="-run TestInstance_CreateWithRDMAVPCInterfaces" <- commented out as it requires manual infra setup at the moment

Related fixes and refactors:

• DevCloud:
  make test-int TEST_ARGS="-run TestVPC_CreateGet_smoke"
make test-int TEST_ARGS="-run TestVPC_Subnet_Create"

• Prod:
  make test-int TEST_ARGS="-run TestVPC_List"
make test-int TEST_ARGS="-run TestVPC_Update"
make test-int TEST_ARGS="-run TestVPC_Create_Invalid_data"
make test-int TEST_ARGS="-run TestVPC_Update_Invalid"
make test-int TEST_ARGS="-run TestVPC_Subnet_Create_Invalid_data"
make test-int TEST_ARGS="-run TestVPC_Subnet_Update_Invalid_data"
make test-int TEST_ARGS="-run TestLKECluster_Enterprise_BYOVPC_smoke"

[Copilot]

Pull request overview

This PR extends the Linode Go client’s VPC + interface models to represent RDMA-capable VPCs/interfaces and adds unit + integration coverage (plus fixtures) to validate (un)marshalling and key RDMA workflows. It’s intended to pair with the feature work in #988 and adds the test/fixture layer around that functionality.

Changes:

• Add VPCType (regular/rdma) to VPC and VPC subnet models and wire it into VPC create options.
• Add RDMA VPC interface models/options plus a new instance-create interface option type that supports RDMA VPC interfaces, with InstanceCreateOptions marshaling support.
• Add unit tests + integration tests + VCR fixtures for RDMA VPCs and RDMA interfaces.

Reviewed changes

Copilot reviewed 26 out of 26 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
vpc.go	Introduces VPCType and adds vpc_type support to VPC and create options.
vpc_subnet.go	Adds vpc_type to VPC subnet responses.
interfaces.go	Adds RDMA VPC interface models/options and instance-create interface option type.
instances.go	Adds LinodeInstanceInterfaces and extends InstanceCreateOptions.MarshalJSON conflict + serialization logic.
test/unit/rdma_vpc_test.go	Unit coverage for RDMA VPC type, RDMA interface (get/list/update), and marshaling semantics.
test/unit/fixtures/vpc_rdma_get.json	Unit fixture for RDMA VPC GET response.
test/unit/fixtures/vpc_rdma_create.json	Unit fixture for RDMA VPC create response/validation.
test/unit/fixtures/interface_update_rdma_vpc.json	Unit fixture for RDMA interface update response.
test/unit/fixtures/interface_list_with_rdma.json	Unit fixture for listing interfaces including RDMA entries.
test/unit/fixtures/interface_get_rdma_vpc.json	Unit fixture for RDMA interface GET response.
test/integration/vpc_test.go	Integration test refactor + adds RDMA VPC create/get/list filter coverage.
test/integration/vpc_subnet_test.go	Integration coverage for subnet vpc_type and RDMA subnet workflows.
test/integration/lke_clusters_test.go	Updates helper return signature usage due to createVPC refactor.
test/integration/instance_interfaces_test.go	Switches instance-create tests to LinodeInstanceInterfaces and adds RDMA interface integration test.
test/integration/fixtures/TestVPC_CreateGet.yaml	Updates recorded interactions to include vpc_type and devcloud URLs.
test/integration/fixtures/TestVPC_Create_Invalid.yaml	Updates recorded invalid-label interaction and message.
test/integration/fixtures/TestInstance_CreateWithLinodeInterfaces.yaml	Updates recorded instance-create interaction for updated VPC/subnet responses and devcloud URLs.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[yec-akamai]

Let me update the base branch and see if it fixes the workflow issues and clean up the git history

[yec-akamai]

There are a few things not compatible from merging v2. I've put up a PR to address them: #1003

After it merged you should be good to rebase from the proj branch into your branch to clean up the commit history. Although it's probably some conflicts to fix. I wonder if it's easier to check out a brand new branch though.

[psnoch-akamai]

@mawilk90 and @yec-akamai, how about rebase of proj/rdma-interfaces branch?

[mawilk90]

@mawilk90 and @yec-akamai, how about rebase of proj/rdma-interfaces branch?

@psnoch-akamai @yec-akamai I rebased the code so it should be fine now