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Fluent Assertions Documentation
FluentAssertions Assembly / FluentAssertions.Types Namespace / TypeAssertions Class
In This Topic
    TypeAssertions Class
    In This Topic
    Contains a number of methods to assert that a System.Type meets certain expectations.
    Object Model
    TypeAssertions ClassAssertionChain Class
    Syntax
    [DebuggerNonUserCode()]
public class TypeAssertions : FluentAssertions.Primitives.ReferenceTypeAssertions<Type,TypeAssertions>
    Inheritance Hierarchy

    System.Object
       FluentAssertions.Primitives.ReferenceTypeAssertions<TSubject,TAssertions>
          FluentAssertions.Types.TypeAssertions

    Public Constructors
     NameDescription
    Public ConstructorTypeAssertions ConstructorInitializes a new instance of the TypeAssertions class.  
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    Public Properties
     NameDescription
    Public PropertyCurrentAssertionChainProvides access to the FluentAssertions.Execution.AssertionChain that this assertion class was initialized with. (Inherited from FluentAssertions.Primitives.ReferenceTypeAssertions<Type,TypeAssertions>)
    Public PropertySubject Gets the object whose value is being asserted. (Inherited from FluentAssertions.Primitives.ReferenceTypeAssertions<Type,TypeAssertions>)
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    Protected Properties
     NameDescription
    Protected PropertyIdentifierOverridden.  Returns the type of the subject the assertion applies on. It should be a user-friendly name as it is included in the failure message. Returns the type of the subject the assertion applies on.  
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    Public Methods
     NameDescription
    Public MethodBeOverloaded. Asserts that the current System.Type is equal to the specified TExpected type.  
    Public MethodBeAbstractAsserts that the current System.Type is abstract.  
    Public MethodBeAssignableToOverloaded. Asserts than an instance of the subject type is assignable variable of type T.  
    Public MethodBeDecoratedWithOverloaded. Asserts that the current System.Type is decorated with the specified TAttribute.  
    Public MethodBeDecoratedWithOrInheritOverloaded. Asserts that the current System.Type is decorated with, or inherits from a parent class, the specified TAttribute.  
    Public MethodBeDerivedFromOverloaded. Asserts that the current System.Type is derived from baseType.  
    Public MethodBeNull Asserts that the current object has not been initialized yet. (Inherited from FluentAssertions.Primitives.ReferenceTypeAssertions<Type,TypeAssertions>)
    Public MethodBeOfTypeOverloaded. Asserts that the object is of the specified type T. (Inherited from FluentAssertions.Primitives.ReferenceTypeAssertions<Type,TypeAssertions>)
    Public MethodBeSameAs Asserts that an object reference refers to the exact same object as another object reference. (Inherited from FluentAssertions.Primitives.ReferenceTypeAssertions<Type,TypeAssertions>)
    Public MethodBeSealedAsserts that the current System.Type is sealed.  
    Public MethodBeStaticAsserts that the current System.Type is static.  
    Public MethodEquals (Inherited from FluentAssertions.Primitives.ReferenceTypeAssertions<Type,TypeAssertions>)
    Public MethodHaveAccessModifierAsserts that the current System.Type has the specified C# accessModifier.  
    Public MethodHaveConstructorAsserts that the current System.Type has a constructor with parameterTypes.  
    Public MethodHaveDefaultConstructorAsserts that the current System.Type has a default constructor.  
    Public MethodHaveExplicitConversionOperatorOverloaded. Asserts that the current System.Type has an explicit conversion operator that converts TSource into TTarget.  
    Public MethodHaveExplicitMethodOverloaded. Asserts that the current System.Type explicitly implements a method named name from interface interfaceType.  
    Public MethodHaveExplicitPropertyOverloaded. Asserts that the current System.Type explicitly implements a property named name from interface interfaceType.  
    Public MethodHaveImplicitConversionOperatorOverloaded. Asserts that the current System.Type has an implicit conversion operator that converts TSource into TTarget.  
    Public MethodHaveIndexerAsserts that the current System.Type has an indexer of type indexerType. with parameter types parameterTypes.  
    Public MethodHaveMethodAsserts that the current System.Type has a method named name with parameter types parameterTypes.  
    Public MethodHavePropertyOverloaded. Asserts that the current System.Type has a property of type propertyType named name.  
    Public MethodImplementOverloaded. Asserts that the current System.Type implements interfaceType.  
    Public MethodMatchOverloaded. Asserts that the predicate is satisfied. (Inherited from FluentAssertions.Primitives.ReferenceTypeAssertions<Type,TypeAssertions>)
    Public MethodNotBeOverloaded. Asserts that the current type is not equal to the specified TUnexpected type.  
    Public MethodNotBeAbstractAsserts that the current System.Type is not abstract.  
    Public MethodNotBeAssignableToOverloaded. Asserts than an instance of the subject type is not assignable variable of type T.  
    Public MethodNotBeDecoratedWithOverloaded. Asserts that the current System.Type is not decorated with the specified TAttribute.  
    Public MethodNotBeDecoratedWithOrInheritOverloaded. Asserts that the current System.Type is not decorated with and does not inherit from a parent class, the specified TAttribute.  
    Public MethodNotBeDerivedFromOverloaded. Asserts that the current System.Type is not derived from baseType.  
    Public MethodNotBeNull Asserts that the current object has been initialized. (Inherited from FluentAssertions.Primitives.ReferenceTypeAssertions<Type,TypeAssertions>)
    Public MethodNotBeOfTypeOverloaded. Asserts that the object is not of the specified type T. (Inherited from FluentAssertions.Primitives.ReferenceTypeAssertions<Type,TypeAssertions>)
    Public MethodNotBeSameAs Asserts that an object reference refers to a different object than another object reference refers to. (Inherited from FluentAssertions.Primitives.ReferenceTypeAssertions<Type,TypeAssertions>)
    Public MethodNotBeSealedAsserts that the current System.Type is not sealed.  
    Public MethodNotBeStaticAsserts that the current System.Type is not static.  
    Public MethodNotHaveAccessModifierAsserts that the current System.Type does not have the specified C# accessModifier.  
    Public MethodNotHaveConstructorAsserts that the current System.Type does not have a constructor with parameterTypes.  
    Public MethodNotHaveDefaultConstructorAsserts that the current System.Type does not have a default constructor.  
    Public MethodNotHaveExplicitConversionOperatorOverloaded. Asserts that the current System.Type does not have an explicit conversion operator that converts TSource into TTarget.  
    Public MethodNotHaveExplicitMethodOverloaded. Asserts that the current System.Type does not explicitly implement a method named name from interface interfaceType.  
    Public MethodNotHaveExplicitPropertyOverloaded. Asserts that the current System.Type does not explicitly implement a property named name from interface interfaceType.  
    Public MethodNotHaveImplicitConversionOperatorOverloaded. Asserts that the current System.Type does not have an implicit conversion operator that converts TSource into TTarget.  
    Public MethodNotHaveIndexerAsserts that the current System.Type does not have an indexer that takes parameter types parameterTypes.  
    Public MethodNotHaveMethodAsserts that the current System.Type does not expose a method named name with parameter types parameterTypes.  
    Public MethodNotHavePropertyAsserts that the current System.Type does not have a property named name.  
    Public MethodNotImplementOverloaded. Asserts that the current System.Type does not implement interfaceType.  
    Public MethodSatisfy<T>Allows combining one or more assertions using the other assertion methods that this library offers on an instance of T. (Inherited from FluentAssertions.Primitives.ReferenceTypeAssertions<Type,TypeAssertions>)
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    Extension Methods
     NameDescription
    Public Extension MethodAs<TTo>Safely casts the specified object to the type specified through TTo.
    Public Extension MethodAwaitingOverloaded. Invokes the specified action on a subject so that you can chain it with any of the assertions from FluentAssertions.Specialized.NonGenericAsyncFunctionAssertions
    Public Extension MethodEnumeratingOverloaded. Forces enumerating a collection. Should be used to assert that a method that uses the yield keyword throws a particular exception.
    Public Extension MethodExecutionTimeOf<T> Provides methods for asserting the execution time of a method or property.
    Public Extension MethodInvokingOverloaded. Invokes the specified action on a subject so that you can chain it with any of the assertions from FluentAssertions.Specialized.ActionAssertions
    Public Extension MethodMonitorOverloaded. Starts monitoring eventSource for its events.
    Public Extension MethodShouldOverloaded. Returns an FluentAssertions.Specialized.ExecutionTimeAssertions object that can be used to assert the current FluentAssertions.Specialized.ExecutionTime.
    Public Extension MethodShouldOverloaded. Returns an FluentAssertions.Primitives.EnumAssertions<TEnum,TAssertions> object that can be used to assert the current TEnum.
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    Supported Frameworks

    .NET: net5.0, net5.0-windows, net6.0, net6.0-macos, net6.0-windows, net7.0, net7.0-macos, net7.0-windows, net8.0, net8.0-browser, net8.0-macos, net8.0-windows, net9.0, net9.0-browser, net9.0-macos, net9.0-windows, net10.0, net10.0-browser, net10.0-macos, net10.0-windows.

    .NET Standard: netstandard2.0, netstandard2.1.

    .NET Framework: net40, net403, net45, net451, net452, net46, net461, net462, net463, net47, net471, net472, net48, net481.

    See Also

    Reference

    TypeAssertions Members
    FluentAssertions.Types Namespace
    System.Type

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