Knowledgebase

2 Replies to “C# – Assert that a string is not null or empty with NUnit”

1. Hi Roel,

   I believe you can also do the following (in NUnit 3 at least):
   Assert.That(result, Is.Not.Null.Or.Empty, “Result string must not be null or empty”);

   Further details:
   https://github.com/nunit/nunit/wiki/Breaking-Changes

   Thanks,

   Mark

2. Regarding Mark’s comment, that should be
   Assert.That(result, Is.Not.Null.And.Not.Empty);

   Assert.That(“”, Is.Not.Null.Or.Empty); passes because the empty string is not null, or is empty. In fact, because Is.Not.Null passes, the Or.Empty isn’t even hit.

   !string.IsNullOrEmpty is equivalent to !(s == null || s == “”), which is equivalent to s != null && s != “”
   Is.Not.Null.Or.Empty is equivalent to !(s == null) || s == “”, which is equivalent to s != null || s == “”

   This can also be used for collections.

This site uses Akismet to reduce spam. Learn how your comment data is processed.