public void Create_UnknownTarget()
{
// Arrange
PropertyInfo propInfo = typeof(TimeSpan).GetProperty("Hours");
MemberExpression expression = Expression.MakeMemberAccess(ExpressionHelper.GetUnknownExpression(typeof(TimeSpan)), propInfo);
// Act
MemberExpressionFingerprint fingerprint = MemberExpressionFingerprint.Create(expression, new ParserContext());
// Assert
Assert.IsNull(fingerprint, "Unknown operands cannot be parsed.");
}
public void Create_StaticMember()
{
// Arrange
FieldInfo fieldInfo = typeof(TimeSpan).GetField("Zero");
MemberExpression expression = Expression.MakeMemberAccess(null, fieldInfo);
// Act
MemberExpressionFingerprint fingerprint = MemberExpressionFingerprint.Create(expression, new ParserContext());
// Assert
Assert.IsNull(fingerprint.Target, "Static member should have null target fingerprint.");
Assert.AreEqual(fieldInfo, expression.Member);
}
public void Create_InstanceMember()
{
// Arrange
PropertyInfo propInfo = typeof(TimeSpan).GetProperty("Hours");
ParserContext context = new ParserContext()
{
ModelParameter = Expression.Parameter(typeof(TimeSpan), "model")
};
MemberExpression expression = Expression.MakeMemberAccess(context.ModelParameter, propInfo);
// Act
MemberExpressionFingerprint fingerprint = MemberExpressionFingerprint.Create(expression, context);
// Assert
Assert.AreEqual(ExpressionType.Parameter, fingerprint.Target.NodeType);
Assert.AreEqual(propInfo, expression.Member);
}
public void ToExpression()
{
// Arrange
ParserContext context = new ParserContext()
{
ModelParameter = Expression.Parameter(typeof(TimeSpan), "model")
};
PropertyInfo propInfo = typeof(TimeSpan).GetProperty("Hours");
MemberExpression expression = Expression.MakeMemberAccess(context.ModelParameter, propInfo);
MemberExpressionFingerprint fingerprint = MemberExpressionFingerprint.Create(expression, context);
// Act
MemberExpression result = (MemberExpression)fingerprint.ToExpression(context);
// Assert
Assert.AreEqual(context.ModelParameter, result.Expression);
Assert.AreEqual(propInfo, result.Member);
}
public void Comparison_DifferByMember()
{
// fingerprint1 is MEMBER_ACCESS(TimeSpan.Hours, PARAM:TimeSpan):int
// fingerprint2 is MEMBER_ACCESS(TimeSpan.Minutes, PARAM:TimeSpan):int, so not equivalent
// Arrange
ParserContext context = new ParserContext()
{
ModelParameter = Expression.Parameter(typeof(TimeSpan), "model")
};
MemberExpressionFingerprint fingerprint1 = MemberExpressionFingerprint.Create(Expression.MakeMemberAccess(context.ModelParameter, typeof(TimeSpan).GetProperty("Hours")), context);
MemberExpressionFingerprint fingerprint2 = MemberExpressionFingerprint.Create(Expression.MakeMemberAccess(context.ModelParameter, typeof(TimeSpan).GetProperty("Minutes")), context);
// Act
bool areEqual = Object.Equals(fingerprint1, fingerprint2);
// Assert
Assert.IsFalse(areEqual, "Fingerprints should not have been equivalent - differ by MemberExpressionFingerprint.Member.");
}
public void Comparison_EquivalentExpressions()
{
// both fingerprints are MEMBER_ACCESS(String.Length, PARAM:string):int, so are equivalent
// Arrange
ParserContext context = new ParserContext()
{
ModelParameter = Expression.Parameter(typeof(string), "model")
};
PropertyInfo propInfo = typeof(string).GetProperty("Length");
MemberExpressionFingerprint fingerprint1 = MemberExpressionFingerprint.Create(Expression.MakeMemberAccess(context.ModelParameter, propInfo), context);
MemberExpressionFingerprint fingerprint2 = MemberExpressionFingerprint.Create(Expression.MakeMemberAccess(context.ModelParameter, propInfo), context);
// Act
HashSet <ExpressionFingerprint> set = new HashSet <ExpressionFingerprint>()
{
fingerprint1,
fingerprint2
};
// Assert
Assert.AreEqual(1, set.Count, "Fingerprints should have been equivalent.");
}