if (targetBuild == null) {
                targetBuild = Build.newInstance();
            }

            Map<Object, Object> context =
                    Collections.singletonMap(PLUGIN_MANAGEMENT, targetBuild.getPluginManagement());

            Build.Builder builder = Build.newBuilder(targetBuild);
            mergePluginContainer_Plugins(builder, targetBuild, source.getBuild(), false, context);

    assertTrue(multimap().asMap().values().remove(Collections.singleton(v0())));
    assertEquals(2, multimap().size());
    assertEquals(Collections.singletonMap(k0(), Sets.newHashSet(v0(), v3())), multimap().asMap());
  }

    assertTrue(multimap().asMap().values().remove(Collections.singletonList(v0())));
    assertEquals(2, multimap().size());
    assertEquals(
        Collections.singletonMap(k0(), Lists.newArrayList(v0(), v3())), multimap().asMap());
  }

    assertTrue(multimap().asMap().values().remove(Collections.singleton(v0())));
    assertEquals(2, multimap().size());
    assertEquals(Collections.singletonMap(k0(), Sets.newHashSet(v0(), v3())), multimap().asMap());
  }

            ArtifactRepository repository) {
        if (metadata != null && metadata.getFile() != null && metadata.getFile().isFile()) {
            try {
                Map<String, ?> options = Collections.singletonMap(MetadataReader.IS_STRICT, Boolean.FALSE);

                Metadata pluginGroupMetadata = metadataReader.read(metadata.getFile(), options);

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static java.util.Arrays.asList;
import static java.util.Collections.singletonList;
import static java.util.Collections.singletonMap;

public class GradleUserManualPlugin implements Plugin<Project> {

    public static final String DOCS_GRADLE_ORG = "https://docs.gradle.org/";

    @Override
    public void apply(Project project) {

                .thenReturn(basicPrivate);

        List<Toolchain> toolchains =
                toolchainManager.getToolchains(session, "basic", Collections.singletonMap("key", "value"));

        assertEquals(1, toolchains.size());
    }

              @Override
              protected Map<String, String> create(Entry<String, String>[] entries) {
                return Collections.singletonMap(entries[0].getKey(), entries[0].getValue());
              }
            })
        .named("singletonMap")
        .withFeatures(
            MapFeature.ALLOWS_NULL_KEYS,
            MapFeature.ALLOWS_NULL_VALUES,
            MapFeature.ALLOWS_ANY_NULL_QUERIES,

 * limitations under the License.
 */

package com.google.common.collect;

import static com.google.common.base.Preconditions.checkNotNull;
import static java.util.Collections.singletonMap;
import static java.util.stream.Collectors.collectingAndThen;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.base.Preconditions;

    try {
      builder.putAll(Collections.<String, Integer>singletonMap(null, 1));
      fail();
    } catch (NullPointerException expected) {
    }
  }

  public void testBuilderPutNullValueViaPutAll() {
    Builder<String, Integer> builder = ImmutableSortedMap.naturalOrder();
    try {
      builder.putAll(Collections.<String, Integer>singletonMap("one", null));
      fail();