You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

63 lines
1.6 KiB

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