add a test cse for cookie auth

packages/http-client-csharp/emitter/test/Unit/auth.test.ts

@@ -0,0 +1,39 @@
+import { TestHost } from "@typespec/compiler/testing";
+import { ok, strictEqual } from "assert";
+import { beforeEach, describe, it } from "vitest";
+import { createModel } from "../../src/lib/client-model-builder.js";
+import {
+  createEmitterContext,
+  createEmitterTestHost,
+  createNetSdkContext,
+  typeSpecCompile,
+} from "./utils/test-util.js";
+
+describe("Test auth", () => {
+  let runner: TestHost;
+
+  beforeEach(async () => {
+    runner = await createEmitterTestHost();
+  });
+
+  it("cookie header is not supported", async () => {
+    const program = await typeSpecCompile(
+      `
+            op test(): NoContentResponse;
+      `,
+      runner,
+      {
+        AuthDecorator: `@useAuth(ApiKeyAuth<ApiKeyLocation.cookie, "api-key-name">)`,
+      }
+    );
+    const context = createEmitterContext(program);
+    const sdkContext = await createNetSdkContext(context);
+    const root = createModel(sdkContext);
+    const diagnostics = context.program.diagnostics;
+
+    const noAuthDiagnostic = diagnostics.find((d) => d.code === "@typespec/http-client-csharp/unsupported-auth");
+    ok(noAuthDiagnostic);
+    strictEqual(noAuthDiagnostic.message, "Only header is supported for ApiKey authentication. cookie is not supported.");
+    strictEqual(root.Auth, undefined); // we do not support it therefore it falls back to undefined
+  });
+});

packages/http-client-csharp/emitter/test/Unit/utils/test-util.ts

@@ -43,6 +43,7 @@ export interface TypeSpecCompileOptions {
   IsAzureCoreNeeded?: boolean;
   IsTCGCNeeded?: boolean;
   IsXmlNeeded?: boolean;
+  AuthDecorator?: string;
 }
 
 export async function typeSpecCompile(
@@ -54,9 +55,10 @@ export async function typeSpecCompile(
   const needAzureCore = options?.IsAzureCoreNeeded ?? false;
   const needTCGC = options?.IsTCGCNeeded ?? false;
   const needXml = options?.IsXmlNeeded ?? false;
+  const authDecorator = options?.AuthDecorator ?? `@useAuth(ApiKeyAuth<ApiKeyLocation.header, "api-key">)`;
   const namespace = `
     @versioned(Versions)
-    @useAuth(ApiKeyAuth<ApiKeyLocation.header, "api-key">)
+    ${authDecorator}
     @service({
       title: "Azure Csharp emitter Testing",
     })