tests

QWERTYkez.Mensura.Tests/CollectionsRootOfCubeExtensions.cs

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+namespace QWERTYkez.Mensura.Tests;
+
+public class CollectionsRootOfCubeExtensions
+{
+    [Fact]
+    public void Cbrt_Array_CalculatesCorrectly()
+    {
+        Length[] source = [new(4), new(9), new(16), new(25)];
+        // Ожидаем корень, но важно: Math.Sqrt(4) = 2. 
+        // Если ваш код делает специфичные преобразования, адаптируйте Assert.
+        var result = source.Cbrt<Length, Length>();
+
+        Assert.Equal(2, result[0]._Value);
+        Assert.Equal(3, result[1]._Value);
+        Assert.Equal(4, result[2]._Value);
+        Assert.Equal(5, result[3]._Value);
+    }
+
+    [Fact]
+    public void Cbrt_NullableArray_HandlesNulls()
+    {
+        Length?[] source = [new(16), null, new(36)];
+        var result = source.Cbrt<Length, Length>();
+
+        Assert.Equal(4, result[0]?._Value);
+        Assert.Null(result[1]);
+        Assert.Equal(6, result[2]?._Value);
+    }
+
+    [Fact]
+    public void Cbrt_DestinationTooShort_ThrowsArgumentException()
+    {
+        Length[] source = [new(1), new(4)];
+        Length[] dest = new Length[1];
+
+        Assert.Throws<ArgumentException>(() => source.Cbrt(dest));
+    }
+
+    [Fact]
+    public void Cbrt_List_WorksCorrectly()
+    {
+        var list = new List<Length> { new(1), new(4) };
+        var result = list.Cbrt<Length, Length>();
+
+        Assert.Equal(2, result.Count);
+        Assert.Equal(1, result[0]._Value);
+        Assert.Equal(2, result[1]._Value);
+    }
+
+    [Fact]
+    public void Cbrt_IEnumerable_NoExtraAllocations()
+    {
+        IEnumerable<Length> source = new HashSet<Length> { new(9), new(81) };
+        var result = source.Cbrt<Length, Length>().ToList();
+
+        Assert.Contains(result, x => x._Value == 3);
+        Assert.Contains(result, x => x._Value == 9);
+    }
+}