added Asn1BitString tests

Author: Crypt32

tests/Asn1Parser.Tests/Asn1BitStringTests.cs

@@ -0,0 +1,36 @@
+using System;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using SysadminsLV.Asn1Parser.Universal;
+
+namespace Asn1Parser.Tests; 
+[TestClass]
+public class Asn1BitStringTests {
+    [TestMethod]
+    public void TestUnusedBitsCalculator() {
+        Byte unusedBits = Asn1BitString.CalculateUnusedBits([0x1]);
+        Assert.AreEqual(0, unusedBits);
+        unusedBits = Asn1BitString.CalculateUnusedBits([0x2]);
+        Assert.AreEqual(1, unusedBits);
+        unusedBits = Asn1BitString.CalculateUnusedBits([0x4]);
+        Assert.AreEqual(2, unusedBits);
+        unusedBits = Asn1BitString.CalculateUnusedBits([0x8]);
+        Assert.AreEqual(3, unusedBits);
+        unusedBits = Asn1BitString.CalculateUnusedBits([0x10]);
+        Assert.AreEqual(4, unusedBits);
+        unusedBits = Asn1BitString.CalculateUnusedBits([0x20]);
+        Assert.AreEqual(5, unusedBits);
+        unusedBits = Asn1BitString.CalculateUnusedBits([0x40]);
+        Assert.AreEqual(6, unusedBits);
+        unusedBits = Asn1BitString.CalculateUnusedBits([0x80]);
+        Assert.AreEqual(7, unusedBits);
+    }
+    [TestMethod]
+    public void TestBitStringDecodeFromByteArray() {
+        Byte[] array = [3, 2, 5, 0xa0];
+        var bitString = new Asn1BitString(array);
+        Assert.AreEqual(5, bitString.UnusedBits);
+        Assert.IsTrue(array.AsSpan().Slice(3,1).SequenceEqual(bitString.GetValue().Span));
+        Assert.IsTrue(array.AsSpan().Slice(2, 2).SequenceEqual(bitString.GetPayloadAsMemory().Span));
+        Assert.IsTrue(array.AsSpan().SequenceEqual(bitString.GetRawDataAsMemory().Span));
+    }
+}