import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.Map.Entry;
import junit.framework.TestSuite;
import org.jspecify.annotations.NullUnmarked;

/**
 * A generator of {@code TestSuite} instances for testing {@code ByteSink} implementations.
 * Generates tests of all methods on a {@code ByteSink} given various inputs written to it as well

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.util.Map.Entry;
import junit.framework.TestSuite;
import org.jspecify.annotations.NullUnmarked;

/**
 * A generator of {@code TestSuite} instances for testing {@code ByteSink} implementations.
 * Generates tests of all methods on a {@code ByteSink} given various inputs written to it as well

                  CollectionFeature.RESTRICTS_ELEMENTS,
                  ListFeature.SUPPORTS_SET)
              .createTestSuite());
    }
    return suite;
  }

  // Test generators.  To let the GWT test suite generator access them, they need to be
  // public named classes with a public default constructor.

  public static final class FloatsAsListGenerator extends TestFloatListGenerator {
    @Override

                  CollectionFeature.RESTRICTS_ELEMENTS,
                  ListFeature.SUPPORTS_SET)
              .createTestSuite());
    }
    return suite;
  }

  // Test generators.  To let the GWT test suite generator access them, they need to be
  // public named classes with a public default constructor.

  public static final class FloatsAsListGenerator extends TestFloatListGenerator {
    @Override

                  CollectionFeature.RESTRICTS_ELEMENTS,
                  ListFeature.SUPPORTS_SET)
              .createTestSuite());
    }
    return suite;
  }

  // Test generators.  To let the GWT test suite generator access them, they need to be
  // public named classes with a public default constructor.

  public static final class IntsAsListGenerator extends TestIntegerListGenerator {
    @Override

  public static <K, V, M extends Multimap<K, V>> MultimapTestSuiteBuilder<K, V, M> using(
      TestMultimapGenerator<K, V, M> generator) {
    return new MultimapTestSuiteBuilder<K, V, M>().usingGenerator(generator);
  }

  // Class parameters must be raw.
  @SuppressWarnings("rawtypes") // class literals
  @Override
  protected List<Class<? extends AbstractTester>> getTesters() {

      // assumes that each set is a singleton or less (as is done for the samples)
      for (Object elem : elements) {
        @SuppressWarnings("unchecked") // safe by generator contract
        Entry<String, Collection<Integer>> entry = (Entry<String, Collection<Integer>>) elem;
        Integer value = getOnlyElement(entry.getValue());
        builder.put(entry.getKey(), value);
      }

   *     expectContents(E...)} and its friends.
   */
  protected abstract Collection<E> actualContents();

  /**
   * Replaces the existing container under test with a new container created by the subject
   * generator.
   *
   * @see #resetContainer(Object) resetContainer(C)
   * @return the new container instance.
   */
  @CanIgnoreReturnValue
  protected C resetContainer() {

これを動作させるには、**Python 3.7** 以上を使用するか、**Python 3.6** では"backports"をインストールする必要があります:

```
pip install async-exit-stack async-generator
```

これにより<a href="https://github.com/sorcio/async_exit_stack" class="external-link" target="_blank">async-exit-stack</a>と<a href="https://github.com/python-trio/async_generator" class="external-link" target="_blank">async-generator</a>がインストールされます。

///

/// note | 技術詳細

以下と一緒に使用できる関数なら何でも有効です:

 *     class (such as {@link #named}) return this type, so that Builder methods of more derived
 *     classes can be chained onto them without casting.
 * @param <G> The type of the generator to be passed to testers in the generated test suite. An
 *     instance of G should somehow provide an instance of the class under test, plus any other
 *     information required to parameterize the test.