Add type provider integration tests for CancellationToken-overloaded methods

[Copilot]

The CancellationToken PR lacked integration tests that exercise the TP-generated CT overloads end-to-end against a real HTTP server.

Changes

• v3/Swashbuckle.CancellationToken.Tests.fs — new test module with 4 [<Fact>] tests calling TP-generated methods with explicit CT arguments:

  • CancellationToken.None on GET and POST operations
  • Active CancellationTokenSource token (happy path)
  • Pre-cancelled token → asserts OperationCanceledException

• SwaggerProvider.ProviderTests.fsproj — includes the new file, ordered after Swashbuckle.ReturnControllers.Tests.fs (which defines the api instance these tests reuse)

// Explicit CancellationToken.None
let! result = api.GetApiReturnBoolean(CancellationToken.None)

// Active token
use cts = new CancellationTokenSource()
let! result = api.GetApiReturnInt32(cts.Token)

// Pre-cancelled → OperationCanceledException
use cts = new CancellationTokenSource()
cts.Cancel()
let! _ = api.GetApiReturnString(cts.Token)  // throws

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

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[sergey-tihon]

@copilot ci still failing

[Copilot]

@copilot ci still failing

Fixed in e74b3e2. Root cause: Expr.Coerce(expr, typeof<CancellationToken>) generates a castclass IL instruction which is only valid for reference types — CancellationToken is a struct, so the JIT rejected it with InvalidProgramException.

Fix: extract the CT argument by position (always the last parameter in the overload) and use Expr.Cast<Threading.CancellationToken>(ctArg) which is a typed wrapper with no IL cast instruction. Also replaced the fragile sVar.Name = "cancellationToken" check that could collide with OpenAPI spec parameters of the same name.

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[Copilot]

Pull request overview

Adds end-to-end integration coverage for type-provider-generated CancellationToken overloads against the existing Swashbuckle test server, and updates the v3 operation invocation compiler to reliably extract the CT argument.

Changes:

• Add new v3 integration tests that call TP-generated methods with explicit CancellationToken arguments (including pre-cancelled token behavior).
• Register the new test module in the provider test project with correct compile ordering.
• Adjust v3 OperationCompiler to extract CancellationToken by argument position (last argument) instead of by name.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/SwaggerProvider.ProviderTests/v3/Swashbuckle.CancellationToken.Tests.fs	New integration tests exercising CT overloads (GET/POST, active token, pre-cancelled token).
tests/SwaggerProvider.ProviderTests/SwaggerProvider.ProviderTests.fsproj	Includes the new test file after Swashbuckle.ReturnControllers.Tests.fs to reuse api.
src/SwaggerProvider.DesignTime/v3/OperationCompiler.fs	Changes CT extraction in provided method invoke code to be position-based and avoid prior name/cast issues.

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[Copilot]

The PR title/description focuses on adding integration tests, but this hunk also changes type provider code generation behavior (CancellationToken argument extraction). Please update the PR description/title to reflect the compiler change (or split into a separate PR) so reviewers don’t miss the functional impact.

[Copilot]

This failwith message is likely only hit when TP invocation arguments are unexpected, but it would be much easier to diagnose if it included the operation/method name (e.g., providedMethodName) and the received argument count. Consider switching to failwithf with that context.

Suggested change

	| [] -> failwith "Expected CancellationToken argument but argument list was empty"
	| [] ->
	failwithf
	"Method '%s' expected a CancellationToken argument as the last parameter but received %d argument(s)."
	providedMethodName
	allArgs.Length