public void test_THAT_string_based_null_expression_IS_valid_isnull_expression()
{
var operandBuilder = MockRepository.GenerateStub <IOperandBuilder>();
operandBuilder.Stub(b => b.CreateValueOperandForNativeSyntax(null)).Return(new NullValueOperand()).IgnoreArguments();
var analyzer = new IsNullAnalyzer(null, operandBuilder);
Expression <Func <SPListItem, bool> > expr = x => x["Count"] == (DataTypes.Integer)null;
Assert.That(analyzer.IsValid(expr), Is.True);
}
public void test_THAT_isnull_expression_IS_determined_properly()
{
// arrange
Expression <Func <SPListItem, bool> > expr = x => x["Count"] == null;
var operandBuilder = MockRepository.GenerateStub <IOperandBuilder>();
operandBuilder.Stub(b => b.CreateFieldRefOperand(expr.Body, null)).Return(null);
operandBuilder.Stub(b => b.CreateValueOperandForNativeSyntax(expr.Body)).Return(new NullValueOperand()).IgnoreArguments();
var analyzer = new IsNullAnalyzer(null, operandBuilder);
// act
var operation = analyzer.GetOperation(expr);
//assert
Assert.That(operation, Is.InstanceOf <IsNullOperation>());
}
private bool isNullExpression(LambdaExpression expr, out IsNullAnalyzer analyzer)
{
// the simplest way to check if this IsNotNull expression - is to reuse IsNotNullAnalyzer
analyzer = new IsNullAnalyzer(this.operationResultBuilder, this.operandBuilder);
return(analyzer.IsValid(expr));
}
