NUnit1036

The value for 'from' must be less than 'to' when 'step' is positive

Topic	Value
Id	NUnit1036
Severity	Error
Enabled	True
Category	Structure
Code	RangeUsageAnalyzer

Description

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

Motivation

The Range attribute is used to specify a range of values for a parameter in a test method. If the from value is greater than the to value when the step is positive, this would result in no valid range. To prevent this NUnit will throw an exception at runtime.

[Test]
public void TestMethod([Range(10, 0, 2)] int value)
{
    // Test code here
}

How to fix violations

Either specify a to value that is greater than the from value, or use a negative step value if the intention is to generate values in reverse order.

[Test]
public void TestMethod([Range(0, 10, 2)] int value)
{
    // Test code here
}

Configure severity

Via ruleset file

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

Via .editorconfig file

# NUnit1036: The value for 'from' must be less than 'to' when 'step' is positive
dotnet_diagnostic.NUnit1036.severity = chosenSeverity

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

Via #pragma directive

#pragma warning disable NUnit1036 // The value for 'from' must be less than 'to' when 'step' is positive
Code violating the rule here
#pragma warning restore NUnit1036 // The value for 'from' must be less than 'to' when 'step' is positive

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

#pragma warning disable NUnit1036 // The value for 'from' must be less than 'to' when 'step' is positive

Via attribute [SuppressMessage]

[System.Diagnostics.CodeAnalysis.SuppressMessage("Structure",
    "NUnit1036:The value for 'from' must be less than 'to' when 'step' is positive",
    Justification = "Reason...")]