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Deprecate value argument in "to have property" #688

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This commit adds a small utility function that can be used when we add deprecation notices for assertions. I've also added a nice deprecation notice for that value argument in "to have property", outputted once, that informs the user what to do:
Screenshot 2020-01-05 at 17 09 41

Arrange for this to contain the logic for showing once. Do a little
extra work to make sure the warning is coloured on the console.
lib/utils.js Outdated
.text(message, 'bgYellow', 'black')
.toString(format)
);
};
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You can get the output format this way:

const format = expect.outputFormat()

So this should also work:

const output = expect.output.clone(expect.outputFormat())

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@sunesimonsen that actually doesn't work currently - seems that the method is only allowed on the top-level expect.. should we change that?

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That would be okay with me. Just keep in mind that this method also allow you to give it an argument to change the default format.

lib/utils.js Outdated
return;
}

deprecationWarningDisplayed = true;
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I don't think we should be cleaver about how much we show that warning.

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Then we can make a proper style for the warning in styles.js and make a util for printing them to the console.

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Let's keep it simple.

Create a deprecationWarning style used for the yellow on black
colouring. Keep things simple (per review) and remove the one-time
only check which further reduces things down to a simple call. Pass
the expect instance for its .output rather than requiring magicpen.
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