NUnit1037

The value for 'from' must be greater than 'to' when 'step' is negative

Description

Ensure that 'from' is greater than 'to' when 'step' is negative.

Motivation

The Range attribute is used to specify a range of values for a parameter in a test method. If the from value is less than the to value when the step is negative, this would result in endless range. To prevent this NUnit will throw an exception at runtime.

[Test]
public void TestMethod([Range(0, 10, -1)] int value)
{
    // Test code here
}

How to fix violations

Either specify a to value that is less than the from value, or use a positive step value if the intention is to generate values in ascending order.

[Test]
public void TestMethod([Range(0, 10, 1)] int value)
{
    // Test code here
}

Configure severity

Via ruleset file

Configure the severity per project, for more info see MSDN.

Via .editorconfig file

# NUnit1037: The value for 'from' must be greater than 'to' when 'step' is negative
dotnet_diagnostic.NUnit1037.severity = chosenSeverity

where chosenSeverity can be one of none, silent, suggestion, warning, or error.

Via #pragma directive

#pragma warning disable NUnit1037 // The value for 'from' must be greater than 'to' when 'step' is negative
Code violating the rule here
#pragma warning restore NUnit1037 // The value for 'from' must be greater than 'to' when 'step' is negative

Or put this at the top of the file to disable all instances.

#pragma warning disable NUnit1037 // The value for 'from' must be greater than 'to' when 'step' is negative

Via attribute [SuppressMessage]

[System.Diagnostics.CodeAnalysis.SuppressMessage("Structure",
    "NUnit1037:The value for 'from' must be greater than 'to' when 'step' is negative",
    Justification = "Reason...")]