create test for ByteExtension

test/extension/ByteExtensionTest.cs

@@ -1,6 +1,28 @@
+using System.Text;
+using Byter;
+using Xunit;
+
 namespace ByterTest.extension;
 
 public class ByteExtensionTest
 {
-
+    private const string BaseText = "Byter is a bytes serializer!";
+
+    [Fact]
+    public void GetString()
+    {
+        byte[] defBytes = BaseText.GetBytes(StringExtension.Default);
+        byte[] utf8Bytes = BaseText.GetBytes(Encoding.UTF8);
+        byte[] utf16Bytes = BaseText.GetBytes(Encoding.Unicode);
+        byte[] utf32Bytes = BaseText.GetBytes(Encoding.UTF32);
+
+        Assert.Equal(BaseText, defBytes.GetString());
+        Assert.Equal(BaseText, utf8Bytes.GetString(Encoding.UTF8));
+        Assert.Equal(BaseText, utf16Bytes.GetString(Encoding.Unicode));
+        Assert.Equal(BaseText, utf32Bytes.GetString(Encoding.UTF32));
+
+        Assert.NotEqual(BaseText, utf16Bytes.GetString(Encoding.UTF8));
+        Assert.NotEqual(BaseText, utf32Bytes.GetString(Encoding.Unicode));
+        Assert.NotEqual(BaseText, utf8Bytes.GetString(Encoding.UTF32));
+    }
 }