In Doc/faq/design.rst there's "with an eye to making it easily tested.".

I'm not native english, but I think "making" is wrong here, maybe "make"?

"making" looks fine to me as a native English speaker.  I'm not sure it's properly correct English, but it's fine colloquially and I don't think "make" would improve it :)

If anything, I'd change "to" to "toward", or possibly replace "an eye to" with "the goal of".

"Writing test suites is very helpful, and you might want to plan your code based on expectation of making it easy for testing."

I agree with Zach's suggestions.

If I were to rewrite and pass through a grammar checker, I would get closer to this (removing the verbose "an eye to":

Writing test suites is very helpful, and you might want to design your code to make it easily tested.

In other words, it is fine as is or with modifications. :-)

programmers "plan" their code, they don't "design" it, as far as i know!

It reads fine to me as is.

FWIW I agree that "with an eye to ..." sounds too complex. It would be great to change it to "with the goal of...".

Hi, first time on here. And new to the python bug tracker. But, the sentence might read fine as is, or could be tweaked to say "with an eye toward making it easily tested..." as Zach suggested. It is what my internal grammar alarm jumped to automatically.

The wording from Carol Willing makes it read simpler. Also in the next sentence, 'test-directed development' goes under the name 'test-driven development' as of 2019 (search in google -> https://en.wikipedia.org/wiki/Test-driven_development). I have created a pull request with simpler wording and 'test-driven development'.

CLA is signed, will take time to propagate.

New changeset a0f7119f1584db5b32deffb60a68d830673ebbdf by Raymond Hettinger (Ilya Kamenshchikov) in branch 'master':
bpo-37352: Minor word-smithing for design.rst (GH #14730)
https://github.com/python/cpython/commit/a0f7119f1584db5b32deffb60a68d830673ebbdf