import org.jspecify.annotations.Nullable;

/**
 * Unit test for {@link ImmutableClassToInstanceMap}.
 *
 * @author Kevin Bourrillion
 */
@NullUnmarked
final class ClassToInstanceMapTesting {
  abstract static class TestClassToInstanceMapGenerator
      implements TestMapGenerator<Class<?>, Impl> {

    @Override
    public Class<?>[] createKeyArray(int length) {
      return new Class<?>[length];

import static java.util.Collections.emptyMap;
import static java.util.Collections.singletonMap;
import static org.junit.Assert.assertThrows;

import com.google.common.collect.ClassToInstanceMapTesting.Impl;
import com.google.common.collect.ClassToInstanceMapTesting.TestClassToInstanceMapGenerator;
import com.google.common.collect.testing.MapTestSuiteBuilder;
import com.google.common.collect.testing.features.CollectionFeature;

package com.google.common.collect;

import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertThrows;

import com.google.common.collect.ClassToInstanceMapTesting.Impl;
import com.google.common.collect.ClassToInstanceMapTesting.TestClassToInstanceMapGenerator;
import com.google.common.collect.testing.MapTestSuiteBuilder;
import com.google.common.collect.testing.features.CollectionFeature;