Add multi-service tests for older API versions and shared models

[Copilot]

Plan: Add More Tests for Multiple Services

Test 1: multi-service-older-versions

• Create directory packages/azure-http-specs/specs/azure/resource-manager/multi-service-older-versions
• Create service1.tsp with versioned Compute service (using older version references)
• Create service2.tsp with versioned Disk service (using older version references)
• Create client.tsp that combines both services using older versions
• Create mockapi.ts with mock implementations
• Validate scenarios and mock APIs
• Fix client syntax to use @useDependency instead of version property
• Add version-specific properties (size for VirtualMachine, diskSizeGB for Disk) to distinguish old vs new versions

Test 2: multi-service-shared-models

• Create directory packages/azure-http-specs/specs/azure/resource-manager/multi-service-shared-models
• Create shared-models.tsp with common models used by both services
• Create service1.tsp with Compute service using shared models
• Create service2.tsp with Storage service using shared models
• Create client.tsp that combines both services
• Create mockapi.ts with mock implementations
• Validate scenarios and mock APIs
• Remove unused SharedErrorInfo model
• Add proper namespace definition to shared models

Validation & Formatting

• Run pnpm validate-scenarios to ensure specs are valid
• Run pnpm validate-mock-apis to ensure mock APIs are valid
• Build the package to ensure everything compiles
• Run code formatting
• Code review completed with no issues
• Address all review comments
• Add changeset using chronus

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Spector] Add more tests for multiple services</issue_title>
<issue_description>Add two tests under packages/azure-http-specs/specs/azure/resource-manager:

1. A test that similar to https://github.com/Azure/typespec-azure/tree/main/packages/azure-http-specs/specs/azure/resource-manager/multi-service, but the combined client use older version of two services.
2. A test that similar to https://github.com/Azure/typespec-azure/tree/main/packages/azure-http-specs/specs/azure/resource-manager/multi-service, but two services have shared models.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [Spector] Add more tests for multiple services #3710

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[tadelesh]

@copilot Resolve the comments.

[tadelesh]

@copilot Use pnpm -w change add to add changeset.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/Azure/typespec-azure/@azure-tools/azure-http-specs@3713

commit: 7194a7b

[Copilot]

@copilot Use pnpm -w change add to add changeset.

Added changeset in commit 66217cc. Created .chronus/changes/add-multi-service-tests-2026-01-05-08-56-40.md with changeKind: internal for @azure-tools/azure-http-specs package.