The way to test an idea is to either launch it and see what happens or try to sell it (e.g. try to get a letter of intent before you write a line of code.)
Протестировать идею можно либо начав ее реализовывать и посмотреть, что произойдет, или начать продавать ее пользователям (например, попытаться получить письмо о намерениях покупки продукта прежде чем начать писать код).
He couldn't write a line of code to save his life.
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