NetworkReaderTest to reach 100% NetworkReader coverage

Assets/Mirror/Tests/NetworkReaderTest.cs

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+using System;
+using System.IO;
+using NUnit.Framework;
+using UnityEngine;
+
+namespace Mirror.Tests
+{
+    // NetworkWriterTest already covers most cases for NetworkReader.
+    // only a few are left
+    [TestFixture]
+    public class NetworkReaderTest
+    {
+        [Test]
+        public void ReadBytesCountTooBigTest()
+        {
+            // calling ReadBytes with a count bigger than what is in Reader
+            // should throw an exception
+            byte[] bytes = {0x00, 0x01};
+            NetworkReader reader = new NetworkReader(bytes);
+
+            try
+            {
+                byte[] result = reader.ReadBytes(bytes, bytes.Length + 1);
+                // BAD: IF WE GOT HERE, THEN NO EXCEPTION WAS THROWN
+                Assert.Fail();
+            }
+            catch (EndOfStreamException)
+            {
+                // GOOD
+            }
+        }
+    }
+}

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