public void TestWithExpressionBody()
{
var accessorDeclarationSyntax = SyntaxFactory.AccessorDeclaration(SyntaxKind.GetAccessorDeclaration);
var expressionBody = SyntaxFactory.ArrowExpressionClause(SyntaxFactory.LiteralExpression(SyntaxKind.NullLiteralExpression));
var accessorWithBody = AccessorDeclarationSyntaxExtensions.WithExpressionBody(accessorDeclarationSyntax, expressionBody);
Assert.Null(accessorDeclarationSyntax.ExpressionBody);
Assert.NotNull(accessorWithBody.ExpressionBody);
Assert.Equal(SyntaxKind.NullLiteralExpression, accessorWithBody.ExpressionBody.Expression.Kind());
}
public void TestWithExpressionBody()
{
var accessorDeclarationSyntax = SyntaxFactory.AccessorDeclaration(SyntaxKind.GetAccessorDeclaration);
// With default value is allowed
var accessorWithDefaultBody = AccessorDeclarationSyntaxExtensions.WithExpressionBody(accessorDeclarationSyntax, null);
Assert.Null(AccessorDeclarationSyntaxExtensions.ExpressionBody(accessorWithDefaultBody));
// Non-default throws an exception
var expressionBody = SyntaxFactory.ArrowExpressionClause(SyntaxFactory.LiteralExpression(SyntaxKind.NullLiteralExpression));
Assert.Throws <NotSupportedException>(() => AccessorDeclarationSyntaxExtensions.WithExpressionBody(accessorDeclarationSyntax, expressionBody));
}