Test if property throws exception with nunit

Question

it seems there are no delegates to properties. Is there a convenient way to do the following?

Assert.Throws<InvalidOperationException>(
       delegate
       {
           // Current is a property as we all know
           nullNodeList.GetEnumerator().Current;
       });

score 11 · Accepted Answer · edited Oct 06 '15 at 11:28

11

Fast-forward four years and NUnit now supports this (current version is v2.6 - I've not checked which version this was introduced).

Assert.That(() => nullNodeList.GetEnumerator().Current,
    Throws.InvalidOperationException);

edited Oct 06 '15 at 11:28

Niels van der Rest

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answered Jul 10 '14 at 12:50

EddPorter

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score 8 · Answer 2 · answered Jul 30 '10 at 08:35

8

Assert.Throws<InvalidOperationException>(
    delegate { object current = nullNodeList.GetEnumerator().Current; });

answered Jul 30 '10 at 08:35

Anton Gogolev

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@Anton Hi anton I would like to know is this the way to use to Test for readonly property of a class that is public ? – Deeptechtons Jul 25 '12 at 05:05

score 1 · Answer 3 · answered Jul 30 '10 at 08:36

1

You could try assigning it to a variable or try enumerating:

Assert.Throws<InvalidOperationException>(delegate
{
    // Current is a property as we all know
    object current = nullNodeList.GetEnumerator().Current;
});

answered Jul 30 '10 at 08:36

Darin Dimitrov

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score 0 · Answer 4 · answered Jul 30 '10 at 08:34

0

why not say:

Assert.Throws<InvalidOperationException>(
    () => nullNodeList.GetEnumerator().Current);

answered Jul 30 '10 at 08:34

sukru

2,229
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15

1

You will still need to do an actual (throw away) assignment and keep the {}, so: (() => { var x = nullNodeList.GetEnumerator().Current; }) – bytedev Jan 31 '13 at 16:08
That doesn't compile. Error: Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement – Bartosz Wójtowicz Nov 07 '19 at 13:35
Follow up on @bytedev : For clarity, a discard ( '_' ) can be used (https://learn.microsoft.com/en-us/dotnet/csharp/discards). So the statement becomes: `Assert.Throws(() => { _ = nullNodeList.GetEnumerator().Current; });` – Remco te Wierik Mar 03 '20 at 10:26

Test if property throws exception with nunit

4 Answers4