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ValidationRule Class

Verifies that requests return valid HTTP responses and that the contents of the response match the expected results. This class must be inherited.

Namespace:  Microsoft.VisualStudio.TestTools.WebTesting
Assembly:  Microsoft.VisualStudio.QualityTools.WebTestFramework (in Microsoft.VisualStudio.QualityTools.WebTestFramework.dll)

Syntax

'Declaration
Public MustInherit Class ValidationRule
'Usage
Dim instance As ValidationRule
public abstract class ValidationRule
public ref class ValidationRule abstract
public abstract class ValidationRule

Remarks

User-written validation rules must derive from this class. Validation rules are executed just after the request is complete.

Notes to Inheritors:

When you inherit from ValidationRule, you must override the Validate method and RuleName property.

Examples

The following code sample shows how to inherit from ValidationRule to make a rule that validates the existence of scripts on the Web page.

using System;
using Microsoft.VisualStudio.TestTools.WebTesting;

namespace MyValidationRule
{
    public class ValidatePageContainsScript : ValidationRule
    {
        
        public override string RuleName
        {
            get { return "Validate Script Existence"; }
        }

        public override string RuleDescription
        {
            get { return "Validates that the page has a script."; }
        }

        public override void Validate(object sender, ValidationEventArgs e)
        {
            bool validated = false;
            string foundJS ="";
            string foundVBS = "";

            string message = "Non-valid HTML document";

            if (e.Response.HtmlDocument != null)
            {   // Gets all input tags
                foreach (HtmlTag tag in e.Response.HtmlDocument
                    .GetFilteredHtmlTags(new string[] { "script" }))
                {   // Check type of script for current tag
                    if (tag.GetAttributeValueAsString("type") == "text/JavaScript")
                        foundJS = "Found JavaScript";
                    if (tag.GetAttributeValueAsString("type") == "text/VBScript")
                        foundVBS = "Found VBScript";
                }

                if (foundVBS.Length != 0 || foundJS.Length != 0)
                {
                    validated = true;
                    message = string.Format("{0} {1}", foundJS, foundVBS);
                }
                else
                {
                   message = "No scripts in current page";
                }
            }
            e.IsValid = validated;
            e.Message = message;
        }
    }
}
Imports System
Imports Microsoft.VisualStudio.TestTools.WebTesting

Namespace MyValidationRule
    Public Class ValidatePageContainsScript
        Inherits ValidationRule

        Public Overrides ReadOnly Property RuleName() As String
            Get
                Return "Validate Script Existence"
            End Get
        End Property

        Public Overrides ReadOnly Property RuleDescription() As String
            Get
                Return "Validates that the page has a script"
            End Get
        End Property

        Public Overrides Sub Validate(ByVal sender As Object, _
            ByVal e As ValidationEventArgs)
            Dim validated As Boolean = False
            Dim foundJS As String = String.Empty
            Dim foundVBS As String = String.Empty
            Dim message As String = "Non-valid HTML document"

            If Not e.Response.HtmlDocument Is Nothing Then
                ' Get all input tags
                Dim tag As HtmlTag
                For Each tag In e.Response.HtmlDocument. _
                    GetFilteredHtmlTags(New String() {"script"})
                    ' Check type of script for current tag
                    If tag.GetAttributeValueAsString("type") = "text/JavaScript" _
                        Then
                        foundJS = "Found JavaScript"
                    End If
                    If tag.GetAttributeValueAsString("type") = "text/VBScript" _
                        Then
                        foundVBS = "Found VBScript"
                    End If
                Next

                If Not foundVBS.Length = 0 Or Not foundJS.Length = 0 Then
                    validated = True
                    message = String.Format("{0} {1}", foundJS, foundVBS)
                Else
                    message = "No scripts in current page."
                End If
            End If

            e.IsValid = validated
            e.Message = message

        End Sub
    End Class
End Namespace

Inheritance Hierarchy

System.Object
  Microsoft.VisualStudio.TestTools.WebTesting.ValidationRule
    Microsoft.VisualStudio.TestTools.WebTesting.Rules.ValidateFormField
    Microsoft.VisualStudio.TestTools.WebTesting.Rules.ValidateResponseUrl
    Microsoft.VisualStudio.TestTools.WebTesting.Rules.ValidationRuleFindText
    Microsoft.VisualStudio.TestTools.WebTesting.Rules.ValidationRuleRequestTime
    Microsoft.VisualStudio.TestTools.WebTesting.Rules.ValidationRuleRequiredAttributeValue
    Microsoft.VisualStudio.TestTools.WebTesting.Rules.ValidationRuleRequiredTag

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

See Also

Reference

ValidationRule Members

Microsoft.VisualStudio.TestTools.WebTesting Namespace

Other Resources

How to: Add a Validation Rule to a Web Test

How to: Create a Custom Validation Rule