Testing and Debugging CAP Applications
Subject: SAP Business Application Studio (BAS)
The SAP Cloud Application Programming Model (CAP) offers a streamlined approach to developing enterprise-grade services and applications on SAP Business Technology Platform (BTP). While CAP simplifies development with its opinionated framework, ensuring application quality through effective testing and debugging remains essential.
SAP Business Application Studio (BAS) provides a rich development environment tailored for CAP projects, with integrated tools to test and debug your applications efficiently. This article explores best practices and key techniques to test and debug CAP applications within BAS.
CAP applications are typically composed of:
Effective testing and debugging involve validating these layers both independently and as an integrated system.
npm test or custom scripts to execute tests during development.cds.test API to simulate service calls and assert expected responses.BAS supports JavaScript debugging with breakpoints, step execution, and variable inspection.
Launch the CAP service in debug mode:
cds watch --debug
Attach BAS debugger to the running CAP process, enabling real-time inspection of code execution.
console.log or sophisticated logging frameworks.const { expect } = require('chai');
const cds = require('@sap/cds');
describe('Order Service Handler', () => {
it('should calculate total price correctly', async () => {
const order = { items: [{ price: 10, quantity: 2 }, { price: 5, quantity: 1 }] };
const total = order.items.reduce((sum, item) => sum + item.price * item.quantity, 0);
expect(total).to.equal(25);
});
});
Run with:
npm test
Testing and debugging are critical pillars of CAP application development. SAP Business Application Studio equips developers with powerful tools to ensure code correctness and quickly resolve issues. Combining unit tests, integration tests, and the BAS debugger enables a robust development process that delivers reliable, high-quality CAP services.