public static IEnumerable <object[]> GetUnaryExpressionMatrix()
{
Expression <Func <string, bool> > isNullOrWhiteSpace = str =>
string.IsNullOrWhiteSpace(str);
Expression <Func <string, bool> > isNullOrWhiteSpaceWrapper = str =>
StringWrapper.IsNullOrWhitespace(str);
Expression <Func <string, bool> > isNullOrEmpty = str =>
string.IsNullOrEmpty(str);
var method = (isNullOrWhiteSpace.Body as MethodCallExpression)
.Method;
var methodWrapper = (isNullOrWhiteSpaceWrapper.Body as MethodCallExpression)
.Method;
var methodAlt = (isNullOrEmpty.Body as MethodCallExpression)
.Method;
// everything is the same, should be true
yield return(new object[]
{
Expression.IsTrue("1".AsConstantExpression(), method),
Expression.IsTrue("1".AsConstantExpression(), method),
true
});
// different types = false
yield return(new object[]
{
Expression.IsTrue("1".AsConstantExpression(), method),
Expression.IsTrue("1".AsConstantExpression(), methodWrapper),
false
});
// different method names = false
yield return(new object[]
{
Expression.IsTrue("1".AsConstantExpression(), method),
Expression.IsTrue("1".AsConstantExpression(), methodAlt),
false
});
// null and null = true
yield return(new object[]
{
Expression.IsTrue(true.AsConstantExpression()),
Expression.IsTrue(true.AsConstantExpression()),
true
});
// null and not null = false
yield return(new object[]
{
Expression.IsTrue(true.AsConstantExpression()),
Expression.IsTrue("1".AsConstantExpression(), method),
false
});
// not null and null = false
yield return(new object[]
{
Expression.IsTrue("1".AsConstantExpression(), method),
Expression.IsTrue(true.AsConstantExpression()),
false
});
}
