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#Rails + #rspec : How to use "change" syntax with not_to condition Trick

Last updated at Posted at 2019-11-17

One idea. use change syntax and expect "not to change".

BAD

it do
  expect { subject }.to change { some }.to(true).and_not_to change {
    some.count
  }.by(0)
end

GOOD

it do
  expect { subject }.to change { some }.to(true).and change {
    some.count
  }.by(0)
end

Rspec の change 記法で not_to の否定文をチェーンできない or しづらいので無理やり肯定系で書いてみるのはいかが?

Original by Github issue

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