fix compilation issues

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

@@ -13,7 +13,7 @@ import { XmlTestLibrary } from "@typespec/xml/testing";
 import { LoggerLevel } from "../../../src/lib/logger-level.js";
 import { Logger } from "../../../src/lib/logger.js";
 import { CSharpEmitterOptions } from "../../../src/options.js";
-import { CSharpEmitterContext } from "../../../src/sdk-context.js";
+import { createSdkTypeCache, CSharpEmitterContext } from "../../../src/sdk-context.js";
 
 export async function createEmitterTestHost(): Promise<TestHost> {
   return createTestHost({
@@ -117,10 +117,6 @@ export async function createCSharpSdkContext(
   return {
     ...context,
     logger: new Logger(program.program, LoggerLevel.INFO),
-    __typeCache: {
-      types: new Map(),
-      models: new Map(),
-      enums: new Map(),
-    },
+    __typeCache: createSdkTypeCache(),
   };
 }