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using System;
using System.Collections.Generic;
using System.Linq;
namespace Timeline.Tests
{
public static class XUnitHelper
{
public static IEnumerable<object?[]> ComposeTestData(params IEnumerable<object?[]>[] testDatas)
{
return ComposeTestData(new ArraySegment<IEnumerable<object?[]>>(testDatas));
}
public static IEnumerable<object?[]> ComposeTestData(ArraySegment<IEnumerable<object?[]>> testDatas)
{
if (testDatas.Count == 0)
throw new ArgumentException("Test data list can't be empty.", nameof(testDatas));
if (testDatas.Count == 1)
{
foreach (var d in testDatas[0])
yield return d;
}
else
{
foreach (var head in testDatas[0])
foreach (var rest in ComposeTestData(testDatas.Slice(1)))
yield return head.Concat(rest).ToArray();
}
}
public static IEnumerable<object?[]> AppendTestData(this IEnumerable<object?[]> origin, params IEnumerable<object?>[] toAppend)
{
IEnumerable<object?[]> result = origin;
foreach (var oneToAppend in toAppend)
{
result = ComposeTestData(result, oneToAppend.Select(testData => new object?[] { testData }));
}
return result;
}
}
}
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