test: Add getRemainingTimeInMillis support to testing library (#396)

Closes #270

update context.lambdaContext to return 900_000 (15min) instead of
throwing an error.

---------

Signed-off-by: will Farrell <willfarrell@proton.me>

Author: willfarrell

packages/aws-durable-execution-sdk-js-testing/src/test-runner/local/__tests__/integration/local-durable-test-runner.integration.test.ts

@@ -251,6 +251,8 @@ describe("LocalDurableTestRunner Integration", () => {
 
     const handler = withDurableExecution(
       async (_event: unknown, context: DurableContext) => {
+        expect(context.lambdaContext.getRemainingTimeInMillis()).toBe(900_000);
+        
         // eslint-disable-next-line @typescript-eslint/no-unsafe-return
         const mock1: string = await context.step(() => mockedFunction());
 

packages/aws-durable-execution-sdk-js-testing/src/test-runner/local/__tests__/invoke-handler.test.ts

@@ -192,6 +192,7 @@ describe("invoke-handler", () => {
         logStreamName: "MyLogStreamName",
       });
       expect(typeof context.getRemainingTimeInMillis).toBe("function");
+      expect(context.getRemainingTimeInMillis()).toBe(900_000);
     });
 
     it("should merge custom context values with defaults", () => {

packages/aws-durable-execution-sdk-js-testing/src/test-runner/local/invoke-handler.ts

@@ -35,7 +35,7 @@ export class InvokeHandler {
       logGroupName: "MyLogGroupName",
       logStreamName: "MyLogStreamName",
       getRemainingTimeInMillis: function (): number {
-        throw new Error("Function not implemented.");
+        return 900_000
       },
       done: function (): void {
         throw new Error("Function not implemented.");