public void ThrowsArgumentNullException_When_ParentIsNull()
{
INamedTypeSymbol child = GetSymbol <INamedTypeSymbol, ClassDeclarationSyntax>("class Child { }");
INamedTypeSymbol parent = null !;
Assert.Throws <ArgumentNullException>(() => parent.ContainsSymbol(child));
}
public void ReturnsFalse_When_ParentDoesNotContainChild()
{
INamedTypeSymbol parent = GetSymbol <INamedTypeSymbol, ClassDeclarationSyntax>("class Parent { }");
INamedTypeSymbol child = GetSymbol <INamedTypeSymbol, ClassDeclarationSyntax>("class Child { }");
Assert.False(parent.ContainsSymbol(child));
}
public void ReturnsTrue_When_ParentContainsChild()
{
ClassDeclarationSyntax syntax = GetNode <ClassDeclarationSyntax>("class Parent { class Child { } }");
INamedTypeSymbol parent = GetSymbol <INamedTypeSymbol>(syntax);
INamedTypeSymbol child = parent.GetTypeMembers("Child").First();
Assert.True(parent.ContainsSymbol(child));
}
private static bool TryGetInvalidFriendTypeDiagnostic(
INamedTypeSymbol symbol,
ITypeSymbol?friend,
AttributeData attribute,
HashSet <ITypeSymbol> friendTypes,
[NotNullWhen(true)] out Diagnostic?diagnostic
)
{
if (friend is null ||
friend is not INamedTypeSymbol ||
!(friend.TypeKind is TypeKind.Interface or TypeKind.Class or TypeKind.Struct)
)
{
diagnostic = Diagnostic.Create(
descriptor: DUR0308_TypeIsNotValid,
location: GetFriendArgumentLocation(attribute, symbol),
messageArgs: new[] { symbol, friend }
);
return(true);
}
if (SymbolEqualityComparer.Default.Equals(friend, symbol))
{
diagnostic = Diagnostic.Create(
descriptor: DUR0309_TypeCannotBeFriendOfItself,
location: GetFriendArgumentLocation(attribute, symbol),
messageArgs: new[] { symbol }
);
return(true);
}
if (!friendTypes.Add(friend))
{
diagnostic = Diagnostic.Create(
descriptor: DUR0306_FriendTypeSpecifiedByMultipleAttributes,
location: GetFriendArgumentLocation(attribute, symbol),
messageArgs: new[] { symbol, friend }
);
return(true);
}
if (symbol.ContainsSymbol(friend))
{
diagnostic = Diagnostic.Create(
descriptor: DUR0312_InnerTypeIsImplicitFriend,
location: GetFriendArgumentLocation(attribute, symbol),
messageArgs: new[] { symbol }
);
return(true);
}
diagnostic = null;
return(false);
}