AWS CDK 断言 - 查看堆栈中的单个资源

Question

Current Situation:

1. I have a file that has 11 different NodejsFunction s. I am looking to write assertions with CDK Template .
2. I have code that checks the whole stack, and says "Is there a Lambda handler?": template.hasResourceProperties("AWS::Lambda::Function", { Handler: "index.handler" }))

Requirement:

How do I ensure each NodejsFunction function has Handler: "index.handler" ? Can I narrow down to specific public readonly lambdaExample: NodejsFunction from the stack, or map over the services in the stack?

Current Test:

import { Template } from "aws-cdk-lib/assertions";
import { createStacks } from "../../bin/template";

    describe.only("lambdaStack", () => {
      let allStacks, template: Template;
      beforeAll(async () => {
        allStacks= await createStacks(true);
        template = Template.fromStack(allStacks.lambdaStack);
      });
    
      it("should have Handler = 'handler'", () => template.hasResourceProperties("AWS::Lambda::Function", { Handler: "index.handler" }));
    });

Answer 1

To assert every resource has the desired property, use allResourceProperties :

template.allResourcesProperties("AWS::Lambda::Function", {
  Handler: "index.handler",
});

To assert a given resource (by Logical ID) has the desired property, filter and assert:

expect(
  Object.entries(template.findResources("AWS::Lambda::Function")).filter(
    ([k, v]) =>
      k.match(/^LambdaExample[A-F0-9]{8}$/) &&
      v["Properties"]?.["Handler"] === "index.handler"
  )
).toHaveLength(1);