public void Empty_List_Returns_None_With_ListIsEmptyMsg()
{
// Arrange
var list = new List <ulong>();
// Act
var(r0, r1) = QueryPostsF.GetPreviousAndNext(Rnd.ULng, list);
// Assert
Assert.Null(r0);
Assert.Null(r1);
}
public void Single_Item_Returns_None_With_ListContainsSingleItemMsg()
{
// Arrange
var list = new List <ulong> {
Rnd.ULng
};
// Act
var(r0, r1) = QueryPostsF.GetPreviousAndNext(Rnd.ULng, list);
// Assert
Assert.Null(r0);
Assert.Null(r1);
}
public void Item_Not_In_List_Returns_None_With_ListDoesNotContainItemMsg()
{
// Arrange
var value = 10001U;
var list = new List <ulong> {
Rnd.ULng, Rnd.ULng, Rnd.ULng
};
// Act
var(r0, r1) = QueryPostsF.GetPreviousAndNext(value, list);
// Assert
Assert.Null(r0);
Assert.Null(r1);
}
public void Last_Item_Returns_Previous_Item_And_None()
{
// Arrange
var value = Rnd.ULng;
var prev = Rnd.ULng;
var list = new List <ulong> {
Rnd.ULng, Rnd.ULng, prev, value
};
// Act
var(r0, r1) = QueryPostsF.GetPreviousAndNext(value, list);
// Assert
Assert.NotNull(r0);
Assert.Equal(prev, r0 !.Value);
Assert.Null(r1);
}
public void First_Item_Returns_None_And_Next_Item()
{
// Arrange
var value = Rnd.ULng;
var next = Rnd.ULng;
var list = new List <ulong> {
value, next, Rnd.ULng, Rnd.ULng
};
// Act
var(r0, r1) = QueryPostsF.GetPreviousAndNext(value, list);
// Assert
Assert.Null(r0);
Assert.NotNull(r1);
Assert.Equal(next, r1 !.Value);
}