public void ReturnsTrue_When_HasNoConstraints()
{
IArrayTypeSymbol type = GetSymbol();
Mock <ITypeParameterSymbol> parameter = new();
parameter.SetupGet(p => p.Name).Returns("T");
parameter.SetupGet(p => p.ConstraintTypes).Returns(ImmutableArray.Create <ITypeSymbol>());
Assert.True(type.IsValidForTypeParameter(parameter.Object));
}
public void ThrowsArgumentNullException_When_ArrayTypelIsNull()
{
IArrayTypeSymbol type = null !;
Mock <ITypeParameterSymbol> parameter = new();
parameter.SetupGet(p => p.Name).Returns("T");
parameter.SetupGet(p => p.ConstraintTypes).Returns(ImmutableArray.Create <ITypeSymbol>());
Assert.Throws <ArgumentNullException>(() => type.IsValidForTypeParameter(parameter.Object));
}
public void ReturnsFalse_When_DoesNotInheritFromConstrainedType()
{
IArrayTypeSymbol type = GetSymbol();
Mock <ITypeParameterSymbol> parameter = new();
parameter.SetupGet(p => p.Name).Returns("T");
parameter.SetupGet(p => p.ConstraintTypes).Returns(ImmutableArray.Create <ITypeSymbol>(Compilation.CurrentCompilation.GetTypeByMetadataName("System.Collections.ArrayList") !));
Assert.False(type.IsValidForTypeParameter(parameter.Object));
}
public void ReturnsFalse_When_HasUnmanagedConstraint()
{
IArrayTypeSymbol type = GetSymbol();
Mock <ITypeParameterSymbol> parameter = new();
parameter.SetupGet(p => p.Name).Returns("T");
parameter.SetupGet(p => p.ConstraintTypes).Returns(ImmutableArray.Create <ITypeSymbol>());
parameter.SetupGet(p => p.HasUnmanagedTypeConstraint).Returns(true);
Assert.False(type.IsValidForTypeParameter(parameter.Object));
}
public void ReturnsTrue_When_InheritFromConstraintType_And_ParameterIsConstrainedToNullable()
{
IArrayTypeSymbol type = GetSymbol();
Mock <ITypeParameterSymbol> parameter = new();
parameter.SetupGet(p => p.Name).Returns("T");
parameter.SetupGet(p => p.ConstraintTypes).Returns(ImmutableArray.Create <ITypeSymbol>(Compilation.CurrentCompilation.GetTypeByMetadataName("System.Collections.IList") !));
parameter.SetupGet(p => p.ConstraintNullableAnnotations).Returns(ImmutableArray.Create(NullableAnnotation.Annotated));
Assert.True(type.IsValidForTypeParameter(parameter.Object));
}
public void ReturnsTrue_When_HasNullableReferenceTypeConstraint()
{
IArrayTypeSymbol type = GetSymbol();
Mock <ITypeParameterSymbol> parameter = new();
parameter.SetupGet(p => p.Name).Returns("T");
parameter.SetupGet(p => p.ConstraintTypes).Returns(ImmutableArray.Create <ITypeSymbol>());
parameter.SetupGet(p => p.HasReferenceTypeConstraint).Returns(true);
parameter.SetupGet(p => p.ReferenceTypeConstraintNullableAnnotation).Returns(NullableAnnotation.Annotated);
Assert.True(type.IsValidForTypeParameter(parameter.Object));
}
