docs/articles/nunit-analyzers/NUnit1016.md
| Topic | Value |
|---|---|
| Id | NUnit1016 |
| Severity | Error |
| Enabled | True |
| Category | Structure |
| Code | TestCaseSourceUsesStringAnalyzer |
The source type must have a default constructor in order to provide test cases.
To prevent tests that will fail at runtime due to improper construction.
public class MyTestClass
{
[TestCaseSource(typeof(DivideCases))]
public void DivideTest(int n, int d, int q)
{
ClassicAssert.AreEqual(q, n / d);
}
}
class DivideCases : IEnumerable
{
public DivideCases(int i) { }
public IEnumerator GetEnumerator()
{
yield return new object[] { 12, 3, 4 };
yield return new object[] { 12, 2, 6 };
yield return new object[] { 12, 4, 3 };
}
}
In the sample above, the class DivideCases does not have a default constructor - i.e. a constructor with no parameters.
However, source types specified by TestCaseSource
must have a default constructor.
Add a default constructor to the source type (or remove the parameters from an existing constructor):
public class MyTestClass
{
[TestCaseSource(typeof(DivideCases))]
public void DivideTest(int n, int d, int q)
{
ClassicAssert.AreEqual(q, n / d);
}
}
class DivideCases : IEnumerable
{
public DivideCases() { }
public DivideCases(int i) { }
public IEnumerator GetEnumerator()
{
yield return new object[] { 12, 3, 4 };
yield return new object[] { 12, 2, 6 };
yield return new object[] { 12, 4, 3 };
}
}
Configure the severity per project, for more info see MSDN.
# NUnit1016: The source type does not have a default constructor
dotnet_diagnostic.NUnit1016.severity = chosenSeverity
where chosenSeverity can be one of none, silent, suggestion, warning, or error.
#pragma warning disable NUnit1016 // The source type does not have a default constructor
Code violating the rule here
#pragma warning restore NUnit1016 // The source type does not have a default constructor
Or put this at the top of the file to disable all instances.
#pragma warning disable NUnit1016 // The source type does not have a default constructor
[SuppressMessage][System.Diagnostics.CodeAnalysis.SuppressMessage("Structure",
"NUnit1016:The source type does not have a default constructor",
Justification = "Reason...")]