TESTS

QWERTYkez.Mensura.Tests/CollectionsPow2ExtensionsTest.cs

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+namespace QWERTYkez.Mensura.Tests;
+
+public class CollectionsPow2ExtensionsTest
+{
+    [Fact]
+    public void Pow2_Array_CalculatesCorrectly()
+    {
+        // Arrange
+        Length[] source = [new(2), new(3), new(10)];
+
+        // Act
+        Length[] result = source.Pow2<Length, Length>();
+
+        // Assert
+        Assert.Equal(4, result[0]._Value);
+        Assert.Equal(9, result[1]._Value);
+        Assert.Equal(100, result[2]._Value);
+    }
+
+    [Fact]
+    public void Pow2_NullableArray_HandlesNulls()
+    {
+        // Arrange
+        Length?[] source = [new(5), null, new(4)];
+
+        // Act
+        Length?[] result = source.Pow2<Length, Length>();
+
+        // Assert
+        Assert.Equal(25, result[0]?._Value);
+        Assert.Null(result[1]);
+        Assert.Equal(16, result[2]?._Value);
+    }
+
+    [Fact]
+    public void Pow2_List_ReturnsCorrectResult()
+    {
+        // Arrange
+        var source = new List<Length> { new(2), new(8) };
+
+        // Act
+        var result = source.Pow2<Length, Length>();
+
+        // Assert
+        Assert.Equal(4, result[0]._Value);
+        Assert.Equal(64, result[1]._Value);
+    }
+
+    [Fact]
+    public void Pow2_IEnumerable_ProcessesCorrectly()
+    {
+        // Arrange
+        IEnumerable<Length> source = new HashSet<Length> { new(3), new(7) };
+
+        // Act
+        var result = source.Pow2<Length, Length>().ToList();
+
+        // Assert
+        Assert.Contains(result, x => x._Value == 9);
+        Assert.Contains(result, x => x._Value == 49);
+    }
+
+    [Fact]
+    public void Pow2_DestinationTooShort_ThrowsArgumentException()
+    {
+        // Arrange
+        Length[] source = [new(2), new(3)];
+        Length[] dest = new Length[1];
+
+        // Act & Assert
+        Assert.Throws<ArgumentException>(() => source.Pow2(dest));
+    }
+}