Common signs: developers afraid to change code and logic bugs returning. Usual causes: no unit tests. What we do: add focused unit tests around risky logic. What you get: tests, a coverage report and safer refactoring.
Our unit testing service adds focused tests around the code that matters most, such as calculations, pricing, scoring, permissions and data handling, so changes stop breaking logic that used to work. A Codersarts engineer writes clear tests in your existing framework and leaves you a coverage report. Fixed price from $199 with 1-day delivery.
Unit Tests at a Glance
Item | Details |
|---|---|
Starting price | $199 for one module |
Delivery | 1 day per module |
Frameworks | Jest, Vitest, Mocha, pytest, JUnit, xUnit, PHPUnit, RSpec |
Focus | Business logic, calculations, permissions and edge cases |
Report | Coverage before and after |
What you get | Tests that protect your riskiest code |
Revisions | One revision round included |
What Are Unit Tests?
Unit tests check small pieces of code, such as a function or class, in isolation. They run in milliseconds, pinpoint exactly what broke, and let developers change or refactor code with confidence, because a failing test shows the problem immediately.
Signs You Need Unit Tests
Developers avoid touching certain files
Calculation or scoring bugs keep coming back
Refactoring feels too risky
Your codebase has little or no test coverage
Code reviews can't tell whether logic is correct
Why Logic Breaks
No tests
Changes are checked by eye.
Tangled code
Logic mixed with database and UI code is hard to test.
Edge cases
Boundary values and empty inputs aren't handled.
Fast delivery
Tests were skipped to ship quickly.
Quick Checks You Can Try First
List the functions where a bug would cost the most.
Write one test for the normal case of one function.
Add a test for an empty or boundary value.
Run your test command in CI.
If the problem remains, our engineers take it from there.
How We Add Unit Tests
Pick. We choose the riskiest module with you.
Measure. We record current coverage.
Refactor lightly. We make small changes so logic can be tested, where needed.
Write tests. We cover normal, edge and error cases.
Report. We show coverage before and after.
Hand over. We explain how to add tests for new code.
What You Get
Unit tests for one module
Edge and error case coverage
A before and after coverage report
Small refactors that make code testable
Notes for writing future tests
Example result (illustrative)
A streak and points module had broken three times in two months. We added 28 unit tests covering daily boundaries, timezones and missed days. Coverage of the module went from 0 to over 90%, and the next change that would have broken streaks failed a test first.
What Is Included and Not Included
Included | Not included |
|---|---|
One module or feature area | Testing the whole codebase |
Unit tests in your existing framework | End-to-end tests (separate task) |
Light refactoring for testability | Major rewrites |
Coverage report | Ongoing test maintenance |
Pricing for Unit Tests
Package | Best for | Starting at | Delivery |
|---|---|---|---|
One module | Tests for your riskiest module | $199 | 1 day |
Core coverage | Several modules of business logic | $599 | 3 days |
Legacy codebase | Test strategy for a large untested codebase | Custom quote | Agreed with you |
You get a fixed quote after we review your setup. You approve the scope before any payment.
Who This Is For
Teams afraid to change critical code
Startups preparing to refactor or scale
Apps with complex calculations or scoring
Codebases inherited from other developers
What We Need From You
Repository access
The module or feature to cover
How to run the project locally
Known bugs in that area
Code and data privacy
We sign an NDA on request, work with the least access needed, and never keep copies of your data after delivery. You own all code, configuration and notes.
Key Terms Explained
Unit test: a test of one small piece of code in isolation
Coverage: the share of code run by tests
Mock: a stand-in for a database or service during a test
Refactoring: changing code structure without changing behavior
Common Mistakes We Avoid
Chasing a coverage percentage instead of covering risky code
Testing implementation details that change often
Skipping edge cases
Tests that depend on each other
Need More Than One Task?
Need a full automation strategy? See Test Automation. Or use Prepaid Developer Hours to cover several tasks from one prepaid balance.
Related Tasks
CI Test Pipeline Setup to run tests automatically
API Test Suite Setup for endpoint tests
Regression Test Before Release before each release
Frequently Asked Questions
How much coverage do we need?
Focus on high coverage of critical logic rather than a single number for the whole codebase.
Can you test messy legacy code?
Yes. We make small, safe refactors where needed so logic can be tested.
Which framework will you use?
Your existing one if you have it; otherwise the standard for your language.
Will tests slow development?
No. Unit tests run in seconds and save time by catching bugs early.
Change Code Without Fear
Tell us which part of your code worries you most, and a Codersarts engineer will put tests around it.