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I know testing vs I know how to test

I know testing vs I know how to test which is much better to use in a sentence. Which is more popular in English form?

Looking on the internet deeply has found these results:

I know testing is the most popular phrase on the web.

I know how to test

12,050 results on the web

I know testing

112,500 results on the web

More popular!

Some examples and use cases from the internet:

Some examples and use cases from the internet:

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