FluentAssertions to check number of characters after decimal point

Question

Using FluentAssertions, is there any nice way to confirm the number of characters after a decimal point? I've been looking for the best way to do this but can't find much on it.

There's nothing built-in for this, but it seems like the first thing you'll need to do is [count the number of decimal digits in the number](https://stackoverflow.com/questions/13477689/find-number-of-decimal-places-in-decimal-value-regardless-of-culture). — gunr2171, Sep 14 '21 at 19:07
`var digits = numberString.Length - numberString.LastIndexOf(CultureInfo.CurrentCulture.NumberFormat.CurrencyDecimalSeparator) - 1;` — John Wu, Sep 15 '21 at 06:16

score 0 · Answer 1 · answered Sep 15 '21 at 05:18

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Or use Should().MatchRegex() on the string representation.

answered Sep 15 '21 at 05:18

Dennis Doomen

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score -1 · Answer 2 · answered Sep 15 '21 at 05:29

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I believe you should use Should().BeApproximately(args) or Should.BeInRange(args)

answered Sep 15 '21 at 05:29

Rafal Kozlowski

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Value and precision are different things. – John Wu Sep 15 '21 at 06:08
Ah, you're completely right. I have no idea why I thought about this that way. – Rafal Kozlowski Sep 16 '21 at 07:14

FluentAssertions to check number of characters after decimal point

2 Answers2