content: // Protocol Buffers - Google's data interchange format
  // Copyright 2008 Google Inc.  All rights reserved.
  // https://developers.google.com/protocol-buffers/
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  package com.google.protobuf;
  
  import proto2_test_check_utf8.TestCheckUtf8.BytesWrapper;
  import proto2_test_check_utf8.TestCheckUtf8.StringWrapper;
  import proto2_test_check_utf8_size.TestCheckUtf8Size.BytesWrapperSize;
  import proto2_test_check_utf8_size.TestCheckUtf8Size.StringWrapperSize;
  import java.io.ByteArrayInputStream;
  import junit.framework.TestCase;
  
  /**
   * Test that protos generated with file option java_string_check_utf8 do in fact perform appropriate
   * UTF-8 checks.
   *
   * @author jbaum@google.com (Jacob Butcher)
   */
  public class CheckUtf8Test extends TestCase {
  
    private static final String UTF8_BYTE_STRING_TEXT = "some text";
    private static final ByteString UTF8_BYTE_STRING = ByteString.copyFromUtf8(UTF8_BYTE_STRING_TEXT);
    private static final ByteString NON_UTF8_BYTE_STRING =
        ByteString.copyFrom(new byte[] {(byte) 0x80}); // A lone continuation byte.
  
    public void testBuildRequiredStringWithGoodUtf8() throws Exception {
      assertEquals(
          UTF8_BYTE_STRING_TEXT, StringWrapper.newBuilder().setReqBytes(UTF8_BYTE_STRING).getReq());
    }
  
    public void testParseRequiredStringWithGoodUtf8() throws Exception {
      ByteString serialized =
          BytesWrapper.newBuilder().setReq(UTF8_BYTE_STRING).build().toByteString();
      assertEquals(UTF8_BYTE_STRING_TEXT, StringWrapper.parser().parseFrom(serialized).getReq());
    }
  
    public void testBuildRequiredStringWithBadUtf8() throws Exception {
      try {
        StringWrapper.newBuilder().setReqBytes(NON_UTF8_BYTE_STRING);
        fail("Expected IllegalArgumentException for non UTF-8 byte string.");
      } catch (IllegalArgumentException exception) {
        assertEquals("Byte string is not UTF-8.", exception.getMessage());
      }
    }
  
    public void testBuildOptionalStringWithBadUtf8() throws Exception {
      try {
        StringWrapper.newBuilder().setOptBytes(NON_UTF8_BYTE_STRING);
        fail("Expected IllegalArgumentException for non UTF-8 byte string.");
      } catch (IllegalArgumentException exception) {
        assertEquals("Byte string is not UTF-8.", exception.getMessage());
      }
    }
  
    public void testBuildRepeatedStringWithBadUtf8() throws Exception {
      try {
        StringWrapper.newBuilder().addRepBytes(NON_UTF8_BYTE_STRING);
        fail("Expected IllegalArgumentException for non UTF-8 byte string.");
      } catch (IllegalArgumentException exception) {
        assertEquals("Byte string is not UTF-8.", exception.getMessage());
      }
    }
  
    public void testParseRequiredStringWithBadUtf8() throws Exception {
      byte[] serialized =
          BytesWrapper.newBuilder().setReq(NON_UTF8_BYTE_STRING).build().toByteArray();
      assertParseBadUtf8(StringWrapper.getDefaultInstance(), serialized);
    }
  
    public void testBuildRequiredStringWithBadUtf8Size() throws Exception {
      try {
        StringWrapperSize.newBuilder().setReqBytes(NON_UTF8_BYTE_STRING);
        fail("Expected IllegalArgumentException for non UTF-8 byte string.");
      } catch (IllegalArgumentException exception) {
        assertEquals("Byte string is not UTF-8.", exception.getMessage());
      }
    }
  
    public void testBuildOptionalStringWithBadUtf8Size() throws Exception {
      try {
        StringWrapperSize.newBuilder().setOptBytes(NON_UTF8_BYTE_STRING);
        fail("Expected IllegalArgumentException for non UTF-8 byte string.");
      } catch (IllegalArgumentException exception) {
        assertEquals("Byte string is not UTF-8.", exception.getMessage());
      }
    }
  
    public void testBuildRepeatedStringWithBadUtf8Size() throws Exception {
      try {
        StringWrapperSize.newBuilder().addRepBytes(NON_UTF8_BYTE_STRING);
        fail("Expected IllegalArgumentException for non UTF-8 byte string.");
      } catch (IllegalArgumentException exception) {
        assertEquals("Byte string is not UTF-8.", exception.getMessage());
      }
    }
  
    public void testParseRequiredStringWithBadUtf8Size() throws Exception {
      byte[] serialized =
          BytesWrapperSize.newBuilder().setReq(NON_UTF8_BYTE_STRING).build().toByteArray();
      assertParseBadUtf8(StringWrapperSize.getDefaultInstance(), serialized);
    }
  
    private void assertParseBadUtf8(MessageLite defaultInstance, byte[] data) throws Exception {
      // Check combinations of (parser vs. builder) x (byte[] vs. InputStream)
      try {
        defaultInstance.getParserForType().parseFrom(data);
        fail("Expected InvalidProtocolBufferException for non UTF-8 byte string.");
      } catch (InvalidProtocolBufferException exception) {
        assertEquals("Protocol message had invalid UTF-8.", exception.getMessage());
      }
      try {
        defaultInstance.newBuilderForType().mergeFrom(data);
        fail("Expected InvalidProtocolBufferException for non UTF-8 byte string.");
      } catch (InvalidProtocolBufferException exception) {
        assertEquals("Protocol message had invalid UTF-8.", exception.getMessage());
      }
      try {
        defaultInstance.getParserForType().parseFrom(new ByteArrayInputStream(data));
        fail("Expected InvalidProtocolBufferException for non UTF-8 byte string.");
      } catch (InvalidProtocolBufferException exception) {
        assertEquals("Protocol message had invalid UTF-8.", exception.getMessage());
      }
      try {
        defaultInstance.newBuilderForType().mergeFrom(new ByteArrayInputStream(data));
        fail("Expected InvalidProtocolBufferException for non UTF-8 byte string.");
      } catch (InvalidProtocolBufferException exception) {
        assertEquals("Protocol message had invalid UTF-8.", exception.getMessage());
      }
    }
  }
  