🧹 Add expect-based tests for interactive scripts #389
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ryandgoulding
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tests/devtools-evm-hardhat-test/test/task/deploy.test.expectations/deploy-all-missing-tag.exp
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In this PR
expect-based testing suites for interactive hardhat tasks.expectis a utility that makes testing interactive commands easy by listening to the output and reacting to it by sending input. It is a way of testing the tasks in isolated runtime (in their own shell) while still being able to "mock" user inputs.expectutility should be preinstalled on mac - if not, it can be installed using e.g. homebrew. On unix systems, it also comes with anautoexpectutility that will "record" the expected interaction and turn it into a test script.The test scripts themselves are written in an interpreted language
Expectk. It has some quite advanced control flow features but for us theexpectandsendinstructions are the two go-to ones. There's a nice little tutorial for expect here