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MSTEST0087: Avoid duplicated DataRow display names

Property Value
Rule ID MSTEST0087
Title Avoid duplicated DataRow display names
Category Usage
Fix is breaking or non-breaking Non-breaking
Enabled by default Yes
Default severity Warning
Introduced in version 4.5.0 (preview)
Is there a code fix No

Cause

Two or more DataRowAttribute instances on the same test method set the same nonempty DisplayName.

Rule description

Duplicate explicit display names make data rows indistinguishable in Test Explorer, reports, and failure output. The rule compares names with ordinal, case-sensitive equality and reports each duplicate after the first occurrence.

[TestMethod]
[DataRow(1, DisplayName = "valid")]
[DataRow(2, DisplayName = "valid")] // Violation
public void Validate(int value) { }

How to fix violations

Give each row a unique display name, or remove DisplayName and let MSTest generate names from the method and arguments.

[DataRow(1, DisplayName = "valid-one")]
[DataRow(2, DisplayName = "valid-two")]

When to suppress warnings

Don't suppress this rule when the rows must remain distinguishable in test results. Suppression is reasonable only when a downstream runner replaces the display names with another unique identity.

Suppress a warning

#pragma warning disable MSTEST0087
// The code that's violating the rule is on this line.
#pragma warning restore MSTEST0087

To disable the rule for a file, folder, or project, set its severity to none in the configuration file.

[*.{cs,vb}]
dotnet_diagnostic.MSTEST0087.severity = none

For more information, see How to suppress code analysis warnings.

See also

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