Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/csharp/src/Google.Protobuf.Test/ByteStringTest.cs

-#region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//     * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//     * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//     * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#endregion
-
-using System;
-using System.Text;
-using NUnit.Framework;
-
-namespace Google.Protobuf
-{
-    public class ByteStringTest
-    {
-        [Test]
-        public void Equality()
-        {
-            ByteString b1 = ByteString.CopyFrom(1, 2, 3);
-            ByteString b2 = ByteString.CopyFrom(1, 2, 3);
-            ByteString b3 = ByteString.CopyFrom(1, 2, 4);
-            ByteString b4 = ByteString.CopyFrom(1, 2, 3, 4);
-            EqualityTester.AssertEquality(b1, b1);
-            EqualityTester.AssertEquality(b1, b2);
-            EqualityTester.AssertInequality(b1, b3);
-            EqualityTester.AssertInequality(b1, b4);
-            EqualityTester.AssertInequality(b1, null);
-#pragma warning disable 1718 // Deliberately calling ==(b1, b1) and !=(b1, b1)
-            Assert.IsTrue(b1 == b1);
-            Assert.IsTrue(b1 == b2);
-            Assert.IsFalse(b1 == b3);
-            Assert.IsFalse(b1 == b4);
-            Assert.IsFalse(b1 == null);
-            Assert.IsTrue((ByteString) null == null);
-            Assert.IsFalse(b1 != b1);
-            Assert.IsFalse(b1 != b2);
-#pragma warning disable 1718
-            Assert.IsTrue(b1 != b3);
-            Assert.IsTrue(b1 != b4);
-            Assert.IsTrue(b1 != null);
-            Assert.IsFalse((ByteString) null != null);
-        }
-
-        [Test]
-        public void EmptyByteStringHasZeroSize()
-        {
-            Assert.AreEqual(0, ByteString.Empty.Length);
-        }
-
-        [Test]
-        public void CopyFromStringWithExplicitEncoding()
-        {
-            ByteString bs = ByteString.CopyFrom("AB", Encoding.Unicode);
-            Assert.AreEqual(4, bs.Length);
-            Assert.AreEqual(65, bs[0]);
-            Assert.AreEqual(0, bs[1]);
-            Assert.AreEqual(66, bs[2]);
-            Assert.AreEqual(0, bs[3]);
-        }
-
-        [Test]
-        public void IsEmptyWhenEmpty()
-        {
-            Assert.IsTrue(ByteString.CopyFromUtf8("").IsEmpty);
-        }
-
-        [Test]
-        public void IsEmptyWhenNotEmpty()
-        {
-            Assert.IsFalse(ByteString.CopyFromUtf8("X").IsEmpty);
-        }
-
-        [Test]
-        public void CopyFromByteArrayCopiesContents()
-        {
-            byte[] data = new byte[1];
-            data[0] = 10;
-            ByteString bs = ByteString.CopyFrom(data);
-            Assert.AreEqual(10, bs[0]);
-            data[0] = 5;
-            Assert.AreEqual(10, bs[0]);
-        }
-
-        [Test]
-        public void ToByteArrayCopiesContents()
-        {
-            ByteString bs = ByteString.CopyFromUtf8("Hello");
-            byte[] data = bs.ToByteArray();
-            Assert.AreEqual((byte)'H', data[0]);
-            Assert.AreEqual((byte)'H', bs[0]);
-            data[0] = 0;
-            Assert.AreEqual(0, data[0]);
-            Assert.AreEqual((byte)'H', bs[0]);
-        }
-
-        [Test]
-        public void CopyFromUtf8UsesUtf8()
-        {
-            ByteString bs = ByteString.CopyFromUtf8("\u20ac");
-            Assert.AreEqual(3, bs.Length);
-            Assert.AreEqual(0xe2, bs[0]);
-            Assert.AreEqual(0x82, bs[1]);
-            Assert.AreEqual(0xac, bs[2]);
-        }
-
-        [Test]
-        public void CopyFromPortion()
-        {
-            byte[] data = new byte[] {0, 1, 2, 3, 4, 5, 6};
-            ByteString bs = ByteString.CopyFrom(data, 2, 3);
-            Assert.AreEqual(3, bs.Length);
-            Assert.AreEqual(2, bs[0]);
-            Assert.AreEqual(3, bs[1]);
-        }
-
-        [Test]
-        public void ToStringUtf8()
-        {
-            ByteString bs = ByteString.CopyFromUtf8("\u20ac");
-            Assert.AreEqual("\u20ac", bs.ToStringUtf8());
-        }
-
-        [Test]
-        public void ToStringWithExplicitEncoding()
-        {
-            ByteString bs = ByteString.CopyFrom("\u20ac", Encoding.Unicode);
-            Assert.AreEqual("\u20ac", bs.ToString(Encoding.Unicode));
-        }
-
-        [Test]
-        public void FromBase64_WithText()
-        {
-            byte[] data = new byte[] {0, 1, 2, 3, 4, 5, 6};
-            string base64 = Convert.ToBase64String(data);
-            ByteString bs = ByteString.FromBase64(base64);
-            Assert.AreEqual(data, bs.ToByteArray());
-        }
-
-        [Test]
-        public void FromBase64_Empty()
-        {
-            // Optimization which also fixes issue 61.
-            Assert.AreSame(ByteString.Empty, ByteString.FromBase64(""));
-        }
-    }
-}