[AttributeUsage(AttributeTargets.Class|AttributeTargets.Method|AttributeTargets.Property|AttributeTargets.Field)]public class VisibleForTestOnly:Attribute
Marker Attribute to indicate a Method/Class/Property has been made more visible for purpose of testing.
Mark the member as internal and make the testing assembly a friend using
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-04 UTC."],[[["\u003cp\u003eThe \u003ccode\u003eVisibleForTestOnly\u003c/code\u003e attribute is used to mark classes, methods, properties, or fields that have been made more visible specifically for testing purposes.\u003c/p\u003e\n"],["\u003cp\u003eTo use \u003ccode\u003eVisibleForTestOnly\u003c/code\u003e, mark the member as internal and make the testing assembly a friend assembly using \u003ccode\u003e[assembly: InternalsVisibleTo("Full.Name.Of.Testing.Assembly")]\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eVisibleForTestOnly\u003c/code\u003e inherits from the \u003ccode\u003eAttribute\u003c/code\u003e class, which itself inherits from the base \u003ccode\u003eobject\u003c/code\u003e class.\u003c/p\u003e\n"],["\u003cp\u003eThis page provides the available versions for the namespace Google.Apis.Testing, with the latest version being 1.69.0.\u003c/p\u003e\n"],["\u003cp\u003eThis page lists several inherited methods from the Attribute class that are used for attribute operations, such as getting custom attributes and checking if an attribute is defined, along with other methods from the object class.\u003c/p\u003e\n"]]],[],null,["# Class VisibleForTestOnly (1.69.0)\n\nVersion latestkeyboard_arrow_down\n\n- [1.69.0 (latest)](/dotnet/docs/reference/Google.Apis/latest/Google.Apis.Testing.VisibleForTestOnly)\n- [1.68.0](/dotnet/docs/reference/Google.Apis/1.68.0/Google.Apis.Testing.VisibleForTestOnly)\n- [1.60.0](/dotnet/docs/reference/Google.Apis/1.60.0/Google.Apis.Testing.VisibleForTestOnly)\n- [1.59.0](/dotnet/docs/reference/Google.Apis/1.59.0/Google.Apis.Testing.VisibleForTestOnly)\n- [1.55.0](/dotnet/docs/reference/Google.Apis/1.55.0/Google.Apis.Testing.VisibleForTestOnly)\n- [1.50.0](/dotnet/docs/reference/Google.Apis/1.50.0/Google.Apis.Testing.VisibleForTestOnly) \n\n [AttributeUsage(AttributeTargets.Class|AttributeTargets.Method|AttributeTargets.Property|AttributeTargets.Field)]\n public class VisibleForTestOnly : Attribute\n\nMarker Attribute to indicate a Method/Class/Property has been made more visible for purpose of testing.\nMark the member as internal and make the testing assembly a friend using \n\n [assembly: InternalsVisibleTo(\"Full.Name.Of.Testing.Assembly\")]\n\nInheritance\n-----------\n\n[object](https://learn.microsoft.com/dotnet/api/system.object) \\\u003e [Attribute](https://learn.microsoft.com/dotnet/api/system.attribute) \\\u003e VisibleForTestOnly \n\nInherited Members\n-----------------\n\n[Attribute.Equals(object)](https://learn.microsoft.com/dotnet/api/system.attribute.equals) \n[Attribute.GetCustomAttribute(Assembly, Type)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattribute#system-attribute-getcustomattribute(system-reflection-assembly-system-type)) \n[Attribute.GetCustomAttribute(Assembly, Type, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattribute#system-attribute-getcustomattribute(system-reflection-assembly-system-type-system-boolean)) \n[Attribute.GetCustomAttribute(MemberInfo, Type)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattribute#system-attribute-getcustomattribute(system-reflection-memberinfo-system-type)) \n[Attribute.GetCustomAttribute(MemberInfo, Type, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattribute#system-attribute-getcustomattribute(system-reflection-memberinfo-system-type-system-boolean)) \n[Attribute.GetCustomAttribute(Module, Type)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattribute#system-attribute-getcustomattribute(system-reflection-module-system-type)) \n[Attribute.GetCustomAttribute(Module, Type, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattribute#system-attribute-getcustomattribute(system-reflection-module-system-type-system-boolean)) \n[Attribute.GetCustomAttribute(ParameterInfo, Type)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattribute#system-attribute-getcustomattribute(system-reflection-parameterinfo-system-type)) \n[Attribute.GetCustomAttribute(ParameterInfo, Type, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattribute#system-attribute-getcustomattribute(system-reflection-parameterinfo-system-type-system-boolean)) \n[Attribute.GetCustomAttributes(Assembly)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-assembly)) \n[Attribute.GetCustomAttributes(Assembly, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-assembly-system-boolean)) \n[Attribute.GetCustomAttributes(Assembly, Type)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-assembly-system-type)) \n[Attribute.GetCustomAttributes(Assembly, Type, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-assembly-system-type-system-boolean)) \n[Attribute.GetCustomAttributes(MemberInfo)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-memberinfo)) \n[Attribute.GetCustomAttributes(MemberInfo, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-memberinfo-system-boolean)) \n[Attribute.GetCustomAttributes(MemberInfo, Type)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-memberinfo-system-type)) \n[Attribute.GetCustomAttributes(MemberInfo, Type, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-memberinfo-system-type-system-boolean)) \n[Attribute.GetCustomAttributes(Module)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-module)) \n[Attribute.GetCustomAttributes(Module, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-module-system-boolean)) \n[Attribute.GetCustomAttributes(Module, Type)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-module-system-type)) \n[Attribute.GetCustomAttributes(Module, Type, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-module-system-type-system-boolean)) \n[Attribute.GetCustomAttributes(ParameterInfo)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-parameterinfo)) \n[Attribute.GetCustomAttributes(ParameterInfo, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-parameterinfo-system-boolean)) \n[Attribute.GetCustomAttributes(ParameterInfo, Type)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-parameterinfo-system-type)) \n[Attribute.GetCustomAttributes(ParameterInfo, Type, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.getcustomattributes#system-attribute-getcustomattributes(system-reflection-parameterinfo-system-type-system-boolean)) \n[Attribute.GetHashCode()](https://learn.microsoft.com/dotnet/api/system.attribute.gethashcode) \n[Attribute.IsDefaultAttribute()](https://learn.microsoft.com/dotnet/api/system.attribute.isdefaultattribute) \n[Attribute.IsDefined(Assembly, Type)](https://learn.microsoft.com/dotnet/api/system.attribute.isdefined#system-attribute-isdefined(system-reflection-assembly-system-type)) \n[Attribute.IsDefined(Assembly, Type, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.isdefined#system-attribute-isdefined(system-reflection-assembly-system-type-system-boolean)) \n[Attribute.IsDefined(MemberInfo, Type)](https://learn.microsoft.com/dotnet/api/system.attribute.isdefined#system-attribute-isdefined(system-reflection-memberinfo-system-type)) \n[Attribute.IsDefined(MemberInfo, Type, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.isdefined#system-attribute-isdefined(system-reflection-memberinfo-system-type-system-boolean)) \n[Attribute.IsDefined(Module, Type)](https://learn.microsoft.com/dotnet/api/system.attribute.isdefined#system-attribute-isdefined(system-reflection-module-system-type)) \n[Attribute.IsDefined(Module, Type, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.isdefined#system-attribute-isdefined(system-reflection-module-system-type-system-boolean)) \n[Attribute.IsDefined(ParameterInfo, Type)](https://learn.microsoft.com/dotnet/api/system.attribute.isdefined#system-attribute-isdefined(system-reflection-parameterinfo-system-type)) \n[Attribute.IsDefined(ParameterInfo, Type, bool)](https://learn.microsoft.com/dotnet/api/system.attribute.isdefined#system-attribute-isdefined(system-reflection-parameterinfo-system-type-system-boolean)) \n[Attribute.Match(object)](https://learn.microsoft.com/dotnet/api/system.attribute.match) \n[Attribute.TypeId](https://learn.microsoft.com/dotnet/api/system.attribute.typeid) \n[object.Equals(object, object)](https://learn.microsoft.com/dotnet/api/system.object.equals#system-object-equals(system-object-system-object)) \n[object.GetType()](https://learn.microsoft.com/dotnet/api/system.object.gettype) \n[object.MemberwiseClone()](https://learn.microsoft.com/dotnet/api/system.object.memberwiseclone) \n[object.ReferenceEquals(object, object)](https://learn.microsoft.com/dotnet/api/system.object.referenceequals) \n[object.ToString()](https://learn.microsoft.com/dotnet/api/system.object.tostring)\n\nNamespace\n---------\n\n[Google.Apis.Testing](/dotnet/docs/reference/Google.Apis/latest/Google.Apis.Testing)\n\nAssembly\n--------\n\nGoogle.Apis.Core.dll\n\nExtension Method\n----------------\n\n[Utilities.ThrowIfNull\\\u003cT\\\u003e(T, string)](/dotnet/docs/reference/Google.Apis/latest/Google.Apis.Util.Utilities#Google_Apis_Util_Utilities_ThrowIfNull__1___0_System_String_)"]]
