Add comprehensive unit tests for Lambda Labs provider with HTTP mocking

[devin-ai-integration]

Add comprehensive unit tests for GetInstanceTypes method

Summary

This PR adds comprehensive unit tests for the Lambda Labs provider's GetInstanceTypes method and related helper functions, addressing feedback from @theFong on PR #7. The tests are organized in a new instancetype_test.go file to logically separate instance type operations from instance lifecycle tests.

Key additions:

• Tests for GetInstanceTypes with success, error, and filtering scenarios
• Tests for location and instance type filtering functionality
• Tests for GetInstanceTypePollTime method
• Tests for helper functions convertLambdaLabsInstanceTypeToV1InstanceType and parseGPUFromDescription
• HTTP mocking of /api/v1/instance-types endpoint with realistic OpenAPI response structure
• Mock data creation functions with proper OpenAPI model compliance

Review & Testing Checklist for Human

• Verify mock response structure matches real Lambda Labs API - The httpmock responses should accurately reflect the actual /api/v1/instance-types endpoint structure, including all required OpenAPI fields
• Test GPU parsing with real instance descriptions - The parseGPUFromDescription regex patterns were adjusted multiple times during development; validate they work with actual Lambda Labs instance type descriptions
• Validate filtering logic with various input combinations - Test location filtering, instance type filtering, and combined filters with real API responses to ensure edge cases are handled correctly
• Confirm OpenAPI model field requirements - Ensure InstanceTypeSpecs mock data includes all required fields (vcpus, gpus, etc.) as defined in the OpenAPI specification

Recommended test plan: Run the tests against a staging Lambda Labs environment to verify mock responses match reality, then test filtering scenarios with various location and instance type combinations.

---

Diagram

%%{ init : { "theme" : "default" }}%%
graph TD
    A["internal/lambdalabs/v1/<br/>instancetype.go"]:::context
    B["internal/lambdalabs/v1/<br/>instancetype_test.go"]:::major-edit
    C["internal/lambdalabs/v1/<br/>common_test.go"]:::context
    D["pkg/v1/<br/>instancetype.go"]:::context
    E["OpenAPI Models"]:::context

    A -->|implements| D
    B -->|tests| A
    B -->|uses setup from| C
    B -->|mocks| E
    A -->|uses| E

    B -->|"HTTP mocks<br/>/api/v1/instance-types"| A
    B -->|"Tests filtering<br/>and conversion"| A

    subgraph Legend
        L1["Major Edit"]:::major-edit
        L2["Minor Edit"]:::minor-edit  
        L3["Context/No Edit"]:::context
    end

    classDef major-edit fill:#90EE90
    classDef minor-edit fill:#87CEEB
    classDef context fill:#FFFFFF

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Notes

• Session details: Requested by @theFong, session URL: https://app.devin.ai/sessions/bebbbff4f073471bbfed283fdd209b31
• Test development notes: Test expectations required multiple adjustments during development to match actual implementation behavior, particularly around GPU name parsing and memory handling
• OpenAPI compliance: Mock data creation functions ensure all required fields are included per the Lambda Labs OpenAPI specification
• Logical separation: Instance type tests are now separated from instance lifecycle tests for better organization and maintainability

[devin-ai-integration]

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[theFong]

Please break up client_test.go into smaller files. like capabilities_test.go instance_test.go etc

[theFong]

are we missing get instance type test? Can you add that?