add unit test for lambda function from file path

Author: roryhackney

packages/rest-api-construct/src/construct.test.ts

@@ -4,6 +4,30 @@ import { App, Stack } from 'aws-cdk-lib';
 import { Template } from 'aws-cdk-lib/assertions';
 import * as lambda from 'aws-cdk-lib/aws-lambda';
 
+void describe('RestApiConstruct', () => {
+  void it('loads a function if the folder is specified', () => {
+    const app = new App();
+    const stack = new Stack(app);
+    new RestApiConstruct(stack, 'RestApiLambdaTest', {
+      apiName: 'RestApiLambdaTest',
+      apiProps: [
+        {
+          path: 'items',
+          routes: ['GET'],
+          lambdaEntry: {
+            runtime: lambda.Runtime.NODEJS_18_X,
+            source: { path: 'packages/rest-api-construct/lib/test-assets' },
+          },
+        },
+      ],
+    });
+    const template = Template.fromStack(stack);
+    template.hasResourceProperties('AWS::Lambda::Function', {
+      Handler: 'index.handler',
+    });
+  });
+});
+
 void describe('RestApiConstruct', () => {
   void it('creates a queue if specified', () => {
     const app = new App();

packages/rest-api-construct/src/construct.ts

@@ -30,8 +30,7 @@ export class RestApiConstruct extends Construct {
       const source = lambdaEntry.source;
 
       // Determine Lambda code source - either ExistingDirectory, NewFromCode, or ExistingLambda (function already exists in aws and does not need to be constructed)
-      let code: lambda.AssetCode | lambda.InlineCode =
-        lambda.Code.fromInline('');
+      let code!: lambda.AssetCode | lambda.InlineCode;
       if ('path' in source) {
         const src = source as ExistingDirectory;
         code = lambda.Code.fromAsset(src.path);

packages/rest-api-construct/src/test-assets/index.ts

@@ -0,0 +1,6 @@
+/**
+ * Hello world lambda used for testing providing a file for lambda for a rest api path
+ */
+export const handler = () => {
+  return 'Hello World! This is a lambda function.';
+};