Testing Methodology

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Overview

At Formbricks, we maintain a rigorous testing strategy to ensure high-quality code and reliable functionality. Our testing approach is standardized and integrated into our development workflow.

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Testing Structure

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Unit Testing with Vitest

We use Vitest as our primary testing framework. All unit tests follow these conventions:

1. File Location and Naming

   • Test files are co-located with the source files they test
   • Test files use the .test.ts extension (e.g., utils.test.ts tests utils.ts)

2. Test Organization

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   import { describe, expect, test } from "vitest";
   
   describe("ComponentName or FeatureName", () => {
     describe("functionName or scenario", () => {
       // We use the `test` function instead of `it` throught our test suite
       test("should describe expected behavior", () => {
         // test implementation
       });
     });
   });
   

3. Coverage Requirements

   • Minimum 85% code coverage requirement
   • Coverage is tracked using V8 provider
   • Coverage reports include:
     • Text summaries
     • HTML reports
     • LCOV reports

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End-to-End Testing with Playwright

E2E tests are located in apps/web/playwright/ and focus on critical user workflows.

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Testing Setup

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Configuration

Our Vitest configuration (vite.config.ts) includes:

test: {
exclude: ['playwright/', 'node_modules/'],
setupFiles: ['../../packages/lib/vitestSetup.ts'],
coverage: {
provider: 'v8',
reporter: ['text', 'html', 'lcov'],
reportsDirectory: './coverage',
},
}

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Test Utilities

Common test utilities are available in vitestSetup.ts:

• Mock implementations for commonly used functions
• Test lifecycle hooks (beforeEach, afterEach)
• Validation test helpers

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Best Practices

1. Test Independence

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   beforeEach(() => {
     vi.resetModules();
     vi.resetAllMocks();
   });
   
   afterEach(() => {
     vi.clearAllMocks();
   });
   

2. Mocking

   • Use Vitest’s built-in mocking utilities
   • Mock external dependencies and services
   • Example:
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   vi.mock("@formbricks/database", () => ({
     prisma: {
       user: {
         create: vi.fn(),
         findUnique: vi.fn(),
       },
     },
   }));
   

3. Assertions

   • Write clear, specific assertions
   • Test both success and error cases
   • Example:
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   expect(result.ok).toBe(true);
   expect(result.data).toEqual(expectedData);
   expect(async () => await invalidCall()).rejects.toThrow(ValidationError);
   

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Quality Assurance Process

1. Continuous Integration

   • Automated test suite execution on pull requests
   • Coverage reports generation
   • Test results reporting

2. New Features

   • Must include corresponding unit tests
   • Must maintain or improve coverage metrics
   • Must include relevant E2E tests for user-facing features