Functional, unit, and regression testing help ensure code quality when outsourcing software development by measuring how well features function, testing individual lines of code to find bugs, and testing new code for errors or interference. Regular code reviews further test how new code affects the overall software and allow issues to be recognized and fixed immediately.

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HOW TO ENSURE CODE QUALITY WHEN OUTSOURCING SOFTWARE DEVELOPMENT
FUNCTIONAL TESTING
This testing method measures code quality
based on how well each set of features
function within an app, allowing to recreate
the user experience and optimize it.
UNIT TESTING
Allows to test each line of code separately,
to quickly find bugs that might corrupt the
software. This method also helps training
developers to become more analytical as
they create code.
This collaborative method is cost-effective and
grants a comprehensive view of the development
process. It helps to discover coding errors that
need correction.
REGULAR CODE REVIEWS
This method tests how each new code affects
the software, allowing to recognize interference
immediately and fix its cause on the spot.
REGRESSION TESTING