public void Create_UnknownRight()
{
// Arrange
BinaryExpression expression = Expression.Coalesce(Expression.Constant(5, typeof(int?)), ExpressionHelper.GetUnknownExpression(typeof(int?)));
// Act
BinaryExpressionFingerprint fingerprint = BinaryExpressionFingerprint.Create(expression, new ParserContext());
// Assert
Assert.IsNull(fingerprint, "Unknown right operands cannot be parsed.");
}
public void Create_ConversionLambdasAreRejected()
{
// Arrange
Expression <Func <int?, int?> > identityFunc = i => i;
BinaryExpression expression = Expression.Coalesce(Expression.Constant(5, typeof(int?)), Expression.Constant(6, typeof(int?)), identityFunc);
// Act
BinaryExpressionFingerprint fingerprint = BinaryExpressionFingerprint.Create(expression, new ParserContext());
// Assert
Assert.IsNull(fingerprint, "Any BinaryExpression with a non-null Conversion property should be rejected.");
}
public void Create()
{
// Arrange
ParserContext context = new ParserContext()
{
ModelParameter = Expression.Parameter(typeof(object[]), "model")
};
BinaryExpression expression = Expression.ArrayIndex(context.ModelParameter, Expression.Constant(5));
// Act
BinaryExpressionFingerprint fingerprint = BinaryExpressionFingerprint.Create(expression, context);
// Assert
Assert.AreEqual(ExpressionType.ArrayIndex, fingerprint.NodeType);
Assert.AreEqual(ExpressionType.Parameter, fingerprint.Left.NodeType);
Assert.AreEqual(ExpressionType.Constant, fingerprint.Right.NodeType);
}
public void Comparison_EquivalentExpressions()
{
// both fingerprints are ARRAY_INDEX(CONST:object[], CONST:int):object, so are equivalent
// Arrange
ExpressionFingerprint fingerprint1 = BinaryExpressionFingerprint.Create(Expression.ArrayIndex(Expression.Constant(new object[0]), Expression.Constant(0)), new ParserContext());
ExpressionFingerprint fingerprint2 = BinaryExpressionFingerprint.Create(Expression.ArrayIndex(Expression.Constant(new object[0]), Expression.Constant(0)), new ParserContext());
// Act
HashSet <ExpressionFingerprint> set = new HashSet <ExpressionFingerprint>()
{
fingerprint1,
fingerprint2
};
// Assert
Assert.AreEqual(1, set.Count, "Fingerprints should have been equivalent.");
}
public void Comparison_DifferByRight()
{
// fingerprint1 is OP_ADD(CONST:int, PARAM:int):int
// fingerprint2 is OP_ADD(CONST:int, CONST:int):int, so not equivalent
// Arrange
ParserContext context = new ParserContext()
{
ModelParameter = Expression.Parameter(typeof(int), "model")
};
ExpressionFingerprint fingerprint1 = BinaryExpressionFingerprint.Create(Expression.Add(Expression.Constant(0), context.ModelParameter), context);
ExpressionFingerprint fingerprint2 = BinaryExpressionFingerprint.Create(Expression.Add(Expression.Constant(0), Expression.Constant(0)), context);
// Act
bool areEqual = Object.Equals(fingerprint1, fingerprint2);
// Assert
Assert.IsFalse(areEqual, "Fingerprints should not have been equivalent - differ by BinaryExpressionFingerprint.Right.");
}
public void Comparison_DifferByMethod()
{
// fingerprint1 is OP_ADD(TimeSpan.op_Addition, CONST:TimeSpan, CONST:TimeSpan):TimeSpan
// fingerprint2 is OP_ADD(TimeSpan.op_Subtraction, CONST:TimeSpan, CONST:TimeSpan):TimeSpan, so not equivalent
// might be strange using op_Subtraction() for ADD, but at least it makes the Methods different
// Arrange
MethodInfo addMethod = typeof(TimeSpan).GetMethod("op_Addition", BindingFlags.Static | BindingFlags.Public);
MethodInfo subtractMethod = typeof(TimeSpan).GetMethod("op_Subtraction", BindingFlags.Static | BindingFlags.Public);
ExpressionFingerprint fingerprint1 = BinaryExpressionFingerprint.Create(Expression.Add(Expression.Constant(TimeSpan.Zero), Expression.Constant(TimeSpan.Zero), addMethod), new ParserContext());
ExpressionFingerprint fingerprint2 = BinaryExpressionFingerprint.Create(Expression.Add(Expression.Constant(TimeSpan.Zero), Expression.Constant(TimeSpan.Zero), subtractMethod), new ParserContext());
// Act
bool areEqual = Object.Equals(fingerprint1, fingerprint2);
// Assert
Assert.IsFalse(areEqual, "Fingerprints should not have been equivalent - differ by BinaryExpressionFingerprint.Method.");
}