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diff --git a/third_party/protobuf/java/core/src/test/java/com/google/protobuf/RopeByteStringSubstringTest.java b/third_party/protobuf/java/core/src/test/java/com/google/protobuf/RopeByteStringSubstringTest.java
deleted file mode 100644
index dc56f2e9ac..0000000000
--- a/third_party/protobuf/java/core/src/test/java/com/google/protobuf/RopeByteStringSubstringTest.java
+++ /dev/null
@@ -1,127 +0,0 @@
-// 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.
-
-package com.google.protobuf;
-
-import java.io.UnsupportedEncodingException;
-import java.util.Iterator;
-
-/**
- * This class tests {@link RopeByteString#substring(int, int)} by inheriting the tests from
- * {@link LiteralByteStringTest}. Only a couple of methods are overridden.
- *
- * @author carlanton@google.com (Carl Haverl)
- */
-public class RopeByteStringSubstringTest extends LiteralByteStringTest {
-
- @Override
- protected void setUp() throws Exception {
- classUnderTest = "RopeByteString";
- byte[] sourceBytes = ByteStringTest.getTestBytes(22341, 22337766L);
- Iterator<ByteString> iter = ByteStringTest.makeConcretePieces(sourceBytes).iterator();
- ByteString sourceString = iter.next();
- while (iter.hasNext()) {
- sourceString = sourceString.concat(iter.next());
- }
-
- int from = 1130;
- int to = sourceBytes.length - 5555;
- stringUnderTest = sourceString.substring(from, to);
- referenceBytes = new byte[to - from];
- System.arraycopy(sourceBytes, from, referenceBytes, 0, to - from);
- expectedHashCode = -1259260680;
- }
-
- @Override
- public void testGetTreeDepth() {
- assertEquals(classUnderTest + " must have the expected tree depth",
- 3, stringUnderTest.getTreeDepth());
- }
-
- @Override
- public void testToString() throws UnsupportedEncodingException {
- String sourceString = "I love unicode \u1234\u5678 characters";
- ByteString sourceByteString = ByteString.copyFromUtf8(sourceString);
- int copies = 250;
-
- // By building the RopeByteString by concatenating, this is actually a fairly strenuous test.
- StringBuilder builder = new StringBuilder(copies * sourceString.length());
- ByteString unicode = ByteString.EMPTY;
- for (int i = 0; i < copies; ++i) {
- builder.append(sourceString);
- unicode = RopeByteString.concatenate(unicode, sourceByteString);
- }
- String testString = builder.toString();
-
- // Do the substring part
- testString = testString.substring(2, testString.length() - 6);
- unicode = unicode.substring(2, unicode.size() - 6);
-
- assertEquals(classUnderTest + " from string must have the expected type",
- classUnderTest, getActualClassName(unicode));
- String roundTripString = unicode.toString(UTF_8);
- assertEquals(classUnderTest + " unicode bytes must match",
- testString, roundTripString);
- ByteString flatString = ByteString.copyFromUtf8(testString);
- assertEquals(classUnderTest + " string must equal the flat string", flatString, unicode);
- assertEquals(classUnderTest + " string must must have same hashCode as the flat string",
- flatString.hashCode(), unicode.hashCode());
- }
-
- @Override
- public void testCharsetToString() {
- String sourceString = "I love unicode \u1234\u5678 characters";
- ByteString sourceByteString = ByteString.copyFromUtf8(sourceString);
- int copies = 250;
-
- // By building the RopeByteString by concatenating, this is actually a fairly strenuous test.
- StringBuilder builder = new StringBuilder(copies * sourceString.length());
- ByteString unicode = ByteString.EMPTY;
- for (int i = 0; i < copies; ++i) {
- builder.append(sourceString);
- unicode = RopeByteString.concatenate(unicode, sourceByteString);
- }
- String testString = builder.toString();
-
- // Do the substring part
- testString = testString.substring(2, testString.length() - 6);
- unicode = unicode.substring(2, unicode.size() - 6);
-
- assertEquals(classUnderTest + " from string must have the expected type",
- classUnderTest, getActualClassName(unicode));
- String roundTripString = unicode.toString(Internal.UTF_8);
- assertEquals(classUnderTest + " unicode bytes must match",
- testString, roundTripString);
- ByteString flatString = ByteString.copyFromUtf8(testString);
- assertEquals(classUnderTest + " string must equal the flat string", flatString, unicode);
- assertEquals(classUnderTest + " string must must have same hashCode as the flat string",
- flatString.hashCode(), unicode.hashCode());
- }
-}