Test Driven Development is the fastest method to get software onto the market. Being one of the most used methods in the present business world, here is why the method is essential.

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Test-Driven Solution
If you need software developed fast, test-driven development (TDD) is the solution.
By interweaving design, coding and testing, software can be brought into the market
quickly.
It is considered as one of the most effective methods that product development, IT
outsourcing as well as software testing companies are adopting.

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What is Test-Driven Development?
Test-Driven Development is a software development process that involves first writing
a test that fails before you write new functional code.
The primary goal of TDD is specification and not validation. In other words, it’s a way
to think about your requirements or design before you write your functional code.
This ensures that the developer is focused on the purpose of the code and ensure its
functionality.
Agility and speed are the primary drivers for adopting TDD.

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How It Works?
Write a test to see if the software will work. The test is based
on software’s requirements, functions, and specifications.
Run the test to ensure that its appropriate and effective. At
this stage, the test is expected to fail. This indicates that the
test is correct and doesn’t shows false positive results.
Once a sufficient test has been established, the developer
then moves on to writing the code.
Once a piece of code has passed the test, you need to do
refactoring where you can do code cleanup and add new
features.
Developers then can restart the cycle to make code
improvements, add new features or fix errors.
Add a test
Run the test
Make a little
change
Run the test
Pass
Pass
Pass, Development Stops
Fail
Fail

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Difference Between Tdd And Traditional Testing
Developer writes the code but testing is
done at the end of the development process.
More focus on test case design – whether
the test will show accurate execution to
fulfill requirements.
Focus on correctness of the code, but
may not detect all coding defects.
100% coverage is not possible.
It is a linear process.
Traditional Testing
Developer or tester first creates the test
and then developer starts coding to meet
the test’s requirements.
More focus on production code that
verifies whether testing will work properly.
Code is refactored until code passes the test.
Every single line of code is tested thus
giving 100% coverage.
It is a cyclical process.
TDD

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Benefits of Test-Driven Development
Writing the tests requires you to really consider what you want from the code from the
end user’s perspective. So the code better reflects what the user needs.
Helps identify bugs and code defects due to rigorous testing. This lessens the
developer time spent debugging or reworking.
Allows the design to evolve and adapt to your evolving understanding of the problem.
Forces the code to be simplified. You only write code based on the requirements of
the tests.
Helps create code that is maintainable, flexible and easily extensible.

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Drawbacks of Test-Driven Development
The TDD process can be slow in the beginning, but with time productivity increases
significantly.
Particularly when trying to fix bugs, developers tend to get over focused on one or
two coding issues and fail to see the bigger picture.
It is difficult to write good tests that cover all aspects of the software, especially for
innovative software, as the developer needs to be aware of how the software needs to
function.
If the design is changing rapidly, you need to keep changing your tests. You end up
wasting a lot of time writing tests for features that eventually get dropped.

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When You Should Use Test-driven Development?
You need to take the time to ensure that test-driven development is the right approach
for your project.
Test-driven development is good at handling smaller projects, but may start faltering
when applied to incredibly large or complex projects.
Writing tests for a complex feature that may not be fully understood can be very
difficult.
Projects related to legacy code, older apps or third-party systems, do not lend
themselves to test-driven development practices. It can be nearly impossible to
create tests that properly integrate with those systems or legacy code.

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Summary
Test-driven Development is an excellent way to get your product to the market faster.
Shifting to TDD involves a learning phase before developer can be fully operational
and his
productivity increases significantly.
Before choosing TDD for your existing project, ask yourself these questions and then
decide:
Will TDD increase the cost of implementing your functionality and by
how much?
What kind and how many automated tests do you plan to create?
Will TDD simplify your production code or make it more complex?