dust-test

Testing & Quality

Step-by-step guide for writing focused, practical tests for Dust codebases following the 80/20 principle.

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Creating automated tests for Dust codebases

Write focused, practical tests for the current file following the 80/20 principle.

Instructions

When writing tests for a file:

Identify the core functionality: Focus on the most important paths and edge cases that provide 80% of the value
Keep it simple: Write straightforward tests that are easy to understand and maintain
Minimal mocking:
- DO NOT mock the database
- Only mock external services (APIs, third-party services)
- Prefer real implementations when possible
Use factories: Leverage test factories to set up data efficiently
Focus on behavior: Test what the code does, not how it does it

For Front (TypeScript/Next.js)

Setup

Import factories from front/tests/utils/factories
Import utilities from front/tests/utils/utils
Use the test database (no mocking)

Structure

import {describe, it, expect} from "vitest";
import {makeTestWorkspace, makeTestUser} from "tests/utils/factories";

describe ("ComponentName or FunctionName", () => {
    it ("should handle the main happy path", async () => {
        // Arrange: Set up using factories
        const {workspace} = createResourceTest ()

        // Act: Execute the code
        const result = await functionUnderTest (workspace);

        // Assert: Verify behavior
        expect (result).toBeDefined ();
    });

    it ("should handle the most common edge case", async () => {
        // Test the second most important scenario
    });
});

What to test (80/20 focus)

Main success paths
Most common error conditions
Critical edge cases (null/undefined, empty arrays, etc.)
Permission checks (if applicable)

What to skip (diminishing returns)

Exhaustive parameter combinations
Unlikely edge cases
Internal implementation details
UI component rendering (unless critical)

For Connectors/Core

Follow similar principles:

Use factories appropriate to the service
Focus on integration points
Mock external APIs only (Slack, Notion, GitHub, etc.)
Test the database interactions directly

Example Pattern

describe ("createConversation", () => {
    it ("creates conversation with valid params", async () => {
        const {workspace, user} = createResourceTest ()
   
        const conversation = await createConversation ({
            workspace,
            userId: user.id,
            title: "Test"
        });
   
        expect (conversation.sId).toBeDefined ();
        expect (conversation.title).toBe ("Test");
    });
   
    it ("fails without required permissions", async () => {
        const {workspace, user} = createResourceTest ()
   
        await expect (
            createConversation ({workspace, userId: user.id})
        ).rejects.toThrow ("Permission denied");
    });
});

Execution Steps

Read the file to understand its purpose and main exports
Check if a test file already exists (e.g., file.test.ts)
Identify the 2-4 most important functions/behaviors to test
Find or create appropriate factories for test data
Write concise, focused tests
Run tests with npm test -- filetotest to verify they pass