added Asn1RelativeOid unit tests

Author: Crypt32

tests/Asn1Parser.Tests/Asn1RelativeOidTests.cs

@@ -0,0 +1,59 @@
+using System;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using SysadminsLV.Asn1Parser.Universal;
+
+namespace Asn1Parser.Tests;
+
+[TestClass]
+public class Asn1RelativeOidTests {
+    [TestMethod, Description("Tests single-arc, single-byte relative oid.")]
+    public void TestSingleArcShortOid() {
+        testOidBiDirectional("127", "DQF/");
+    }
+    [TestMethod, Description("Tests single-arc, multi-byte relative oid.")]
+    public void TestSingleArcLongOid() {
+        testOidBiDirectional("1234567890", "DQWEzNiFUg==");
+    }
+    [TestMethod, Description("Tests multi-arc, single-byte (each arc) relative oid.")]
+    public void TestMultiArcShortOid() {
+        testOidBiDirectional("127.127", "DQJ/fw==");
+    }
+    [TestMethod, Description("Tests multi-arc, single-byte (each arc) relative oid with leading dot.")]
+    public void TestMultiArcShortLeadingDotOid() {
+        testOidBiDirectional(".127.127", "DQJ/fw==");
+    }
+    [TestMethod, Description("Tests multi-arc, multi-byte (each arc) relative oid.")]
+    public void TestMultiArcLongOid() {
+        testOidBiDirectional("1234567890.1234567890", "DQqEzNiFUoTM2IVS");
+    }
+    [TestMethod, Description("Tests null oid, should throw null reference.")]
+    [ExpectedException(typeof(ArgumentNullException))]
+    public void TestRelativeOidNull() {
+        testOidBiDirectional(null, String.Empty);
+    }
+    [TestMethod, Description("Tests junk oid, should throw")]
+    [ExpectedException(typeof(FormatException))]
+    public void TestRelativeOidJunk() {
+        testOidBiDirectional("junk", String.Empty);
+    }
+
+    static void testOidBiDirectional(String oidString, String expectedB64) {
+        // test OID string -> binary encoding process
+        var oid = new Asn1RelativeOid(oidString);
+        String encodedB64 = Convert.ToBase64String(oid.GetRawData());
+        Assert.AreEqual(expectedB64, encodedB64);
+        if (oidString.StartsWith('.')) {
+            Assert.AreEqual(oidString, oid.Value);
+        } else {
+            Assert.AreEqual("." + oidString, oid.Value);
+        }
+        
+        // test binary -> OID string decoding process
+        oid = new Asn1RelativeOid(Convert.FromBase64String(expectedB64));
+        if (oidString.StartsWith('.')) {
+            Assert.AreEqual(oidString, oid.Value);
+        } else {
+            Assert.AreEqual("." + oidString, oid.Value);
+        }
+    }
+}