if (!source.isEmpty()) {
          return false;
        }
      }
      return true;
    }

    @Override
    public Optional<Long> lengthIfKnown() {
      long result = 0L;
      for (CharSource source : sources) {
        Optional<Long> lengthIfKnown = source.lengthIfKnown();
        if (!lengthIfKnown.isPresent()) {
          return Optional.absent();
        }

   * Returns a view of a slice of this byte source that is at most {@code length} bytes long
   * starting at the given {@code offset}. If {@code offset} is greater than the size of this
   * source, the returned source will be empty. If {@code offset + length} is greater than the size
   * of this source, the returned source will contain the slice starting at {@code offset} and
   * ending at the end of this source.
   *

    INITIALIZE("initialize"),
    GENERATE_SOURCES("generate-sources"),
    PROCESS_SOURCES("process-sources"),
    GENERATE_RESOURCES("generate-resources"),
    PROCESS_RESOURCES("process-resources"),
    COMPILE("compile"),
    PROCESS_CLASSES("process-classes"),
    GENERATE_TEST_SOURCES("generate-test-sources"),
    PROCESS_TEST_SOURCES("process-test-sources"),
    GENERATE_TEST_RESOURCES("generate-test-resources"),

        "validate",
        "initialize",
        "generate-sources",
        "process-sources",
        "generate-resources",
        "process-resources",
        "compile",
        "process-classes",
        "generate-test-sources",
        "process-test-sources",
        "generate-test-resources",
        "process-test-resources",
        "test-compile",
        "process-test-classes",
        "test",

    assertEquals(STRING.length(), source.copyTo(sink));
    assertTrue(source.wasStreamOpened() && source.wasStreamClosed());
    assertTrue(sink.wasStreamOpened() && sink.wasStreamClosed());

    assertEquals(STRING, sink.getString());
  }

  public void testRead_toString() throws IOException {
    assertEquals(STRING, source.read());
    assertTrue(source.wasStreamOpened() && source.wasStreamClosed());
  }

        }
        return getModelId() + " " + getLocation();
    }

    public static InputSource merge(InputSource src1, InputSource src2) {
        return new InputSource(Stream.concat(src1.sources(), src2.sources()).collect(Collectors.toSet()));
    }

  }

  public void testContentEquals() throws IOException {
    assertTrue(source.contentEquals(source));
    assertTrue(source.wasStreamOpened() && source.wasStreamClosed());

    ByteSource equalSource = new TestByteSource(bytes);
    assertTrue(source.contentEquals(equalSource));
    assertTrue(new TestByteSource(bytes).contentEquals(source));

import java.io.File;
import java.io.IOException;

/**
 * A test factory for byte or char sources or sinks. In addition to creating sources or sinks, the
 * factory specifies what content should be expected to be read from a source or contained in a sink
 * given the content data that was used to create the source or that was written to the sink.
 *

 * interface easier to implement for certain types of data sources.
 *
 * <p>{@code Iterator} requires its implementations to support querying the end-of-data status
 * without changing the iterator's state, using the {@link #hasNext} method. But many data sources,
 * such as {@link java.io.Reader#read()}, do not expose this information; the only way to discover

     * Imports the specified dependency management sections into the given target model.
     *
     * @param target The model into which to import the dependency management section, must not be <code>null</code>.
     * @param sources The dependency management sections to import, may be <code>null</code>.
     * @param request The model building request that holds further settings, must not be {@code null}.