Tests, finished for extensions

BackendTests/Utils/ExtensionsTests.cs

@@ -0,0 +1,64 @@
+using System.Text.Json;
+using pacMan.Utils;
+
+namespace BackendTests.Utils;
+
+public class ExtensionsTests
+{
+    #region ToArraySegment(this object obj)
+
+    [Test]
+    public void ToArraySegmentValidObject()
+    {
+        var obj = new { Test = "test" };
+        var segment = obj.ToArraySegment();
+
+        Assert.That(JsonSerializer.Serialize(obj), Has.Length.EqualTo(segment.Count));
+    }
+
+    [Test]
+    public void ToArraySegmentNullableObject()
+    {
+        string? s = null;
+        var segment = s!.ToArraySegment(); // Segment contains: null
+        Assert.That(segment, Has.Count.EqualTo(4));
+    }
+
+    #endregion
+
+    #region GetString(this byte[] bytes, int length)
+
+    private byte[] _bytes = null!;
+
+    [SetUp]
+    public void Setup()
+    {
+        _bytes = "Hello World!"u8.ToArray();
+    }
+
+    [Test]
+    public void GetString_ValidByteArray()
+    {
+        Assert.That(_bytes.GetString(_bytes.Length), Is.EqualTo("Hello World!"));
+    }
+
+    [Test]
+    public void GetString_EmptyByteArray()
+    {
+        Assert.That(new byte[] { }.GetString(0), Is.EqualTo(""));
+    }
+
+    [Test]
+    public void GetString_NegativeLength()
+    {
+        Assert.Throws(typeof(ArgumentOutOfRangeException), () => _bytes.GetString(-1));
+    }
+
+    [Test]
+    public void GetString_LengthGreaterThanByteArrayLength()
+    {
+        Assert.Throws(typeof(ArgumentOutOfRangeException), () => _bytes.GetString(_bytes.Length + 1));
+    }
+
+    #endregion
+}