Code Examples for OwnerShip Matter's Post "Testing AWS AppSync JavaScript Resolvers"

resolverNoBundle.int.test.js

import {
  AppSyncClient,
  EvaluateCodeCommand,
} from '@aws-sdk/client-appsync';

// ARRANGE
const appSync = new AppSyncClient({ region: 'us-west-2' });
const filePath = './src/resolvers/Query.getProduct';
const context = { ... };
const input = {
  runtime: { name: 'APPSYNC_JS', runtimeVersion: '1.0.0'},
  code: fs.readFileSync(filePath, {encoding: 'utf8'}),
  context,
  function: 'response',
};
const command = new EvaluateCodeCommand(input);

// ACT
const result = await appSync.send(command);

// ASSERT
expect(result).toBeDefined();
expect(result.errors).toBeUndefined();
expect(result.evaluationResult).toBeDefined();
// (more expectations)

resolverWithBundle.int.test.js

import esbuild from 'esbuild';

// ARRANGE
const appSync = new AppSyncClient({ region: 'us-west-2' });
const filePath = './src/resolvers/Query.getProduct';
const fileUnderTest = esbuild.buildSync({
  entryPoints: [fileUnderTestPath],
  external: ['@aws-appsync/utils'],
  bundle: true,
  write: false,
  platform: 'node',
  target: 'esnext',
  format: 'esm',
  sourcesContent: false,
}).outputFiles[0].text;
const context = { ... };
const input = {
  runtime: { name: 'APPSYNC_JS', runtimeVersion: '1.0.0'},
  code: fileUnderTest,
  context,
  function: 'response',
};
const command = new EvaluateCodeCommand(input);

// ACT
const result = await appSync.send(command);

// ASSERT
expect(result).toBeDefined();
expect(result.errors).toBeUndefined();
expect(result.evaluationResult).toBeDefined();
// (more expectations)