public AndConstraint<XmlElementAssertions> HaveAttribute( 
   string expectedName,
   string expectedValue,
   string because,
   params object[] becauseArgs
)

Parameters

expectedName

The name of the expected attribute

expectedValue

The value of the expected attribute

because

A formatted phrase as is supported by System.String.Format(System.String,System.Object[]) explaining why the assertion is needed. If the phrase does not start with the word because, it is prepended automatically.

becauseArgs

Zero or more objects to format using the placeholders in because.

Reference

XmlElementAssertions Class
XmlElementAssertions Members
System.Xml.XmlElement
System.String.Format(System.String,System.Object[])