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// Licensed to the.NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using Internal.TypeSystem;
using Xunit;
namespace TypeSystemTests
{
public class ConstraintsValidationTest
{
private TestTypeSystemContext _context;
private ModuleDesc _testModule;
private MetadataType _iNonGenType;
private MetadataType _iGenType;
private MetadataType _arg1Type;
private MetadataType _arg2Type;
private MetadataType _arg3Type;
private MetadataType _structArgWithDefaultCtorType;
private MetadataType _structArgWithoutDefaultCtorType;
private MetadataType _classArgWithDefaultCtorType;
private MetadataType _classArgWithoutDefaultCtorType;
private MetadataType _referenceTypeConstraintType;
private MetadataType _defaultConstructorConstraintType;
private MetadataType _notNullableValueTypeConstraintType;
private MetadataType _simpleTypeConstraintType;
private MetadataType _doubleSimpleTypeConstraintType;
private MetadataType _simpleGenericConstraintType;
private MetadataType _complexGenericConstraint1Type;
private MetadataType _complexGenericConstraint2Type;
private MetadataType _complexGenericConstraint3Type;
private MetadataType _multipleConstraintsType;
public ConstraintsValidationTest()
{
_context = new TestTypeSystemContext(TargetArchitecture.Unknown);
var systemModule = _context.CreateModuleForSimpleName("CoreTestAssembly");
_context.SetSystemModule(systemModule);
_testModule = systemModule;
_iNonGenType = _testModule.GetType("GenericConstraints", "INonGen");
_iGenType = _testModule.GetType("GenericConstraints", "IGen`1");
_arg1Type = _testModule.GetType("GenericConstraints", "Arg1");
_arg2Type = _testModule.GetType("GenericConstraints", "Arg2`1");
_arg3Type = _testModule.GetType("GenericConstraints", "Arg3`1");
_structArgWithDefaultCtorType = _testModule.GetType("GenericConstraints", "StructArgWithDefaultCtor");
_structArgWithoutDefaultCtorType = _testModule.GetType("GenericConstraints", "StructArgWithoutDefaultCtor");
_classArgWithDefaultCtorType = _testModule.GetType("GenericConstraints", "ClassArgWithDefaultCtor");
_classArgWithoutDefaultCtorType = _testModule.GetType("GenericConstraints", "ClassArgWithoutDefaultCtor");
_referenceTypeConstraintType = _testModule.GetType("GenericConstraints", "ReferenceTypeConstraint`1");
_defaultConstructorConstraintType = _testModule.GetType("GenericConstraints", "DefaultConstructorConstraint`1");
_notNullableValueTypeConstraintType = _testModule.GetType("GenericConstraints", "NotNullableValueTypeConstraint`1");
_simpleTypeConstraintType = _testModule.GetType("GenericConstraints", "SimpleTypeConstraint`1");
_doubleSimpleTypeConstraintType = _testModule.GetType("GenericConstraints", "DoubleSimpleTypeConstraint`1");
_simpleGenericConstraintType = _testModule.GetType("GenericConstraints", "SimpleGenericConstraint`2");
_complexGenericConstraint1Type = _testModule.GetType("GenericConstraints", "ComplexGenericConstraint1`2");
_complexGenericConstraint2Type = _testModule.GetType("GenericConstraints", "ComplexGenericConstraint2`2");
_complexGenericConstraint3Type = _testModule.GetType("GenericConstraints", "ComplexGenericConstraint3`2");
_multipleConstraintsType = _testModule.GetType("GenericConstraints", "MultipleConstraints`2");
}
[Fact]
public void TestTypeConstraints()
{
MetadataType instantiatedType;
MetadataType arg2OfInt = _arg2Type.MakeInstantiatedType(_context.GetWellKnownType(WellKnownType.Int32));
MetadataType arg2OfBool = _arg2Type.MakeInstantiatedType(_context.GetWellKnownType(WellKnownType.Boolean));
MetadataType arg2OfObject = _arg2Type.MakeInstantiatedType(_context.GetWellKnownType(WellKnownType.Object));
// ReferenceTypeConstraint
{
instantiatedType = _referenceTypeConstraintType.MakeInstantiatedType(_arg1Type);
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = _referenceTypeConstraintType.MakeInstantiatedType(_iNonGenType);
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = _referenceTypeConstraintType.MakeInstantiatedType(_structArgWithDefaultCtorType);
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _referenceTypeConstraintType.MakeInstantiatedType(_context.GetWellKnownType(WellKnownType.Int32));
Assert.False(instantiatedType.CheckConstraints());
}
// DefaultConstructorConstraint
{
instantiatedType = _defaultConstructorConstraintType.MakeInstantiatedType(_arg1Type);
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = _defaultConstructorConstraintType.MakeInstantiatedType(_classArgWithDefaultCtorType);
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = _defaultConstructorConstraintType.MakeInstantiatedType(_classArgWithoutDefaultCtorType);
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _defaultConstructorConstraintType.MakeInstantiatedType(_context.GetWellKnownType(WellKnownType.Int32));
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = _defaultConstructorConstraintType.MakeInstantiatedType(_structArgWithDefaultCtorType);
Assert.True(instantiatedType.CheckConstraints());
// Structs always have implicit default constructors
instantiatedType = _defaultConstructorConstraintType.MakeInstantiatedType(_structArgWithoutDefaultCtorType);
Assert.True(instantiatedType.CheckConstraints());
}
// NotNullableValueTypeConstraint
{
instantiatedType = _notNullableValueTypeConstraintType.MakeInstantiatedType(_arg1Type);
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _notNullableValueTypeConstraintType.MakeInstantiatedType(_structArgWithDefaultCtorType);
Assert.True(instantiatedType.CheckConstraints());
MetadataType nullable = (MetadataType)_context.GetWellKnownType(WellKnownType.Nullable);
MetadataType nullableOfInt = nullable.MakeInstantiatedType(_context.GetWellKnownType(WellKnownType.Int32));
instantiatedType = _notNullableValueTypeConstraintType.MakeInstantiatedType(nullableOfInt);
Assert.False(instantiatedType.CheckConstraints());
}
// SimpleTypeConstraint and DoubleSimpleTypeConstraint
foreach(var genType in new MetadataType[] { _simpleTypeConstraintType , _doubleSimpleTypeConstraintType })
{
instantiatedType = genType.MakeInstantiatedType(_arg1Type);
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = genType.MakeInstantiatedType(_iNonGenType);
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = genType.MakeInstantiatedType(_classArgWithDefaultCtorType);
Assert.False(instantiatedType.CheckConstraints());
}
// SimpleGenericConstraint
{
instantiatedType = _simpleGenericConstraintType.MakeInstantiatedType(_arg1Type, _arg1Type);
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = _simpleGenericConstraintType.MakeInstantiatedType(_arg1Type, _iNonGenType);
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = _simpleGenericConstraintType.MakeInstantiatedType(_classArgWithDefaultCtorType, _classArgWithoutDefaultCtorType);
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _simpleGenericConstraintType.MakeInstantiatedType(_arg1Type, _context.GetWellKnownType(WellKnownType.Object));
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = _simpleGenericConstraintType.MakeInstantiatedType(_structArgWithDefaultCtorType, _context.GetWellKnownType(WellKnownType.ValueType));
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = _simpleGenericConstraintType.MakeInstantiatedType(_arg1Type, _context.GetWellKnownType(WellKnownType.ValueType));
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _simpleGenericConstraintType.MakeInstantiatedType(_context.GetWellKnownType(WellKnownType.UInt16), _context.GetWellKnownType(WellKnownType.UInt32));
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _simpleGenericConstraintType.MakeInstantiatedType(_context.GetWellKnownType(WellKnownType.UInt16), _context.GetWellKnownType(WellKnownType.ValueType));
Assert.True(instantiatedType.CheckConstraints());
}
// ComplexGenericConstraint1
{
instantiatedType = _complexGenericConstraint1Type.MakeInstantiatedType(_arg1Type, _arg1Type /* uninteresting */);
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _complexGenericConstraint1Type.MakeInstantiatedType(arg2OfInt, _arg1Type /* uninteresting */);
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = _complexGenericConstraint1Type.MakeInstantiatedType(arg2OfBool, _arg1Type /* uninteresting */);
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _complexGenericConstraint1Type.MakeInstantiatedType(arg2OfObject, _arg1Type /* uninteresting */);
Assert.False(instantiatedType.CheckConstraints());
}
// ComplexGenericConstraint2
{
MetadataType arg2OfArg2OfInt = _arg2Type.MakeInstantiatedType(arg2OfInt);
MetadataType arg2OfArg2OfBool = _arg2Type.MakeInstantiatedType(arg2OfBool);
MetadataType arg2OfArg2OfObject = _arg2Type.MakeInstantiatedType(arg2OfObject);
instantiatedType = _complexGenericConstraint2Type.MakeInstantiatedType(_arg1Type, _context.GetWellKnownType(WellKnownType.Int32));
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _complexGenericConstraint2Type.MakeInstantiatedType(arg2OfArg2OfInt, _context.GetWellKnownType(WellKnownType.Int32));
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = _complexGenericConstraint2Type.MakeInstantiatedType(arg2OfArg2OfBool, _context.GetWellKnownType(WellKnownType.Int32));
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _complexGenericConstraint2Type.MakeInstantiatedType(arg2OfArg2OfObject, _context.GetWellKnownType(WellKnownType.Int32));
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _complexGenericConstraint2Type.MakeInstantiatedType(arg2OfArg2OfInt, _context.GetWellKnownType(WellKnownType.Object));
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _complexGenericConstraint2Type.MakeInstantiatedType(arg2OfArg2OfBool, _context.GetWellKnownType(WellKnownType.Object));
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _complexGenericConstraint2Type.MakeInstantiatedType(arg2OfArg2OfObject, _context.GetWellKnownType(WellKnownType.Object));
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = _complexGenericConstraint2Type.MakeInstantiatedType(arg2OfArg2OfInt, _context.GetWellKnownType(WellKnownType.Boolean));
Assert.False(instantiatedType.CheckConstraints());
instantiatedType = _complexGenericConstraint2Type.MakeInstantiatedType(arg2OfArg2OfBool, _context.GetWellKnownType(WellKnownType.Boolean));
Assert.True(instantiatedType.CheckConstraints());
instantiatedType = _complexGenericConstraint2Type.MakeInstantiatedType(arg2OfArg2OfObject, _context.GetWellKnownType(WellKnownType.Boolean));
Assert.False(instantiatedType.CheckConstraints());
}
// ComplexGenericConstraint3
{
MetadataType igenOfObject = _iGenType.MakeInstantiatedType(_context.GetWellKnownType(WellKnownType.Object));
instantiatedType = _complexGenericConstraint3Type.MakeInstantiatedType(igenOfObject, _context.GetWellKnownType(WellKnownType.Object));
Assert.True(instantiatedType.CheckConstraints());
// Variance-compatible instantiation argument
instantiatedType = _complexGenericConstraint3Type.MakeInstantiatedType(igenOfObject, _context.GetWellKnownType(WellKnownType.String));
Assert.True(instantiatedType.CheckConstraints());
// Type that implements the interface
var arg3OfObject = _arg3Type.MakeInstantiatedType(_context.GetWellKnownType(WellKnownType.Object));
instantiatedType = _complexGenericConstraint3Type.MakeInstantiatedType(arg3OfObject, _context.GetWellKnownType(WellKnownType.Object));
Assert.True(instantiatedType.CheckConstraints());
// Type that implements a variant compatible interface
instantiatedType = _complexGenericConstraint3Type.MakeInstantiatedType(arg3OfObject, _context.GetWellKnownType(WellKnownType.String));
Assert.True(instantiatedType.CheckConstraints());
}
// MultipleConstraints
{
// Violate the class constraint
instantiatedType = _multipleConstraintsType.MakeInstantiatedType(_structArgWithDefaultCtorType, _context.GetWellKnownType(WellKnownType.Object));
Assert.False(instantiatedType.CheckConstraints());
// Violate the new() constraint
instantiatedType = _multipleConstraintsType.MakeInstantiatedType(_classArgWithoutDefaultCtorType, _context.GetWellKnownType(WellKnownType.Object));
Assert.False(instantiatedType.CheckConstraints());
// Violate the IGen<U> constraint
instantiatedType = _multipleConstraintsType.MakeInstantiatedType(_arg1Type, _context.GetWellKnownType(WellKnownType.Object));
Assert.False(instantiatedType.CheckConstraints());
// Satisfy all constraints
instantiatedType = _multipleConstraintsType.MakeInstantiatedType(_classArgWithDefaultCtorType, _context.GetWellKnownType(WellKnownType.Object));
Assert.True(instantiatedType.CheckConstraints());
}
}
}
}
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