When I write a document, I am confused when to use test or testing in my document. For example, which one makes a better statement below?
A test engineer vs A testing engineer
software test tool vs software testing tool
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The Oxford English Dictionary defines the adjective:
testing, adj. That tests or puts to the test or proof.
Test, however, is either a noun or a verb. So in your first case, a
test engineer uses the noun form, and translates to "one who engineers tests". A
testing engineer, however, means "an engineer who is performing a test" or "an engineer who is performing a test on something".
software test tool is "a tool to work with software tests" while a
software testing tool is "a tool used to carry out tests on software" or "a tool consisting of software that is designed to perform tests".