public void TestGroupBy()
{
var students = Student.GetSudents();
Func <Student, string> elementSelector = x => x.Name;
Func <Student, string> keySelector = x => x.Class;
Func <string, IEnumerable <string>, KeyValuePair <string, IEnumerable <string> > > resultSelector = (Class, NameList) =>
{
{
return(new KeyValuePair <string, IEnumerable <string> >(Class, NameList));
}
};
var result = LINQFunctions.GroupBy(students,
x => keySelector(x),
y => elementSelector(y),
(ClassName, NamesList) => resultSelector(ClassName, NamesList),
new EqualityComparer <string>()
);
Assert.Equal(2, result.Count());
}
