public void Accumulate_is_lazy()
{
var counter = 0;
var accumulation = AccumulateExtensions.Accumulate(new[] { 1, 2, 3 }, x => x * counter++);
Assert.Equal(0, counter);
accumulation.ToList();
Assert.Equal(3, counter);
}
public void Accumulate_allows_different_return_type()
{
Assert.Equal(new[] { "1", "2", "3" }, AccumulateExtensions.Accumulate(new[] { 1, 2, 3 }, x => x.ToString()));
}
public void Accumulate_within_accumulate()
{
var actual = AccumulateExtensions.Accumulate(new[] { "a", "b", "c" }, c =>
string.Join(" ", AccumulateExtensions.Accumulate(new[] { "1", "2", "3" }, d => c + d)));
Assert.Equal(new[] { "a1 a2 a3", "b1 b2 b3", "c1 c2 c3" }, actual);
}
public void Accumulate_reversed_strings()
{
Assert.Equal("eht kciuq nworb xof cte".Split(' '), AccumulateExtensions.Accumulate("the quick brown fox etc".Split(' '), Reverse));
}
public void Accumulate_upcases()
{
Assert.Equal(new List<string> { "HELLO", "WORLD" }, AccumulateExtensions.Accumulate(new List<string> { "hello", "world" }, x => x.ToUpper()));
}
public void Accumulate_squares()
{
Assert.Equal(new[] { 1, 4, 9 }, AccumulateExtensions.Accumulate(new[] { 1, 2, 3 }, x => x * x));
}
public void Empty_accumulation_produces_empty_accumulation()
{
Assert.Equal(new int[0], AccumulateExtensions.Accumulate(new int[0], x => x * x));
}