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

        // Full NTLM handshake testing would require more complex mocking

        // Arrange - Mock a server that supports NTLM
        mockResponse(HTTP_UNAUTHORIZED, "Unauthorized", Collections.singletonMap("WWW-Authenticate", Collections.singletonList("NTLM")),
                new ByteArrayInputStream(new byte[0]));

        // Act - Trigger handshake
        int responseCode = ntlmConnection.getResponseCode();

        if (org.apache.maven.artifact.Artifact.SCOPE_SYSTEM.equals(artifact.getScope())) {
            String localPath = (artifact.getFile() != null) ? artifact.getFile().getPath() : "";
            props = Collections.singletonMap(MavenArtifactProperties.LOCAL_PATH, localPath);
        }

        Artifact result = new DefaultArtifact(
                artifact.getGroupId(),
                artifact.getArtifactId(),

        NullPointerException.class,
        () -> builder.putAll(Collections.<String, Integer>singletonMap(null, 1)));
  }

  public void testBuilderPutNullValueViaPutAll() {
    Builder<String, Integer> builder = new Builder<>();
    assertThrows(
        NullPointerException.class,
        () -> builder.putAll(Collections.<String, Integer>singletonMap("one", null)));
  }

  public void testPuttingTheSameKeyTwiceThrowsOnBuild() {

 * 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 static java.util.stream.Collectors.toMap;

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

import static com.google.common.truth.Truth.assertWithMessage;
import static java.util.Arrays.asList;
import static java.util.Collections.emptyMap;
import static java.util.Collections.singleton;
import static java.util.Collections.singletonMap;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.base.Converter;

import static com.google.common.truth.Truth.assertWithMessage;
import static java.util.Arrays.asList;
import static java.util.Collections.emptyMap;
import static java.util.Collections.singleton;
import static java.util.Collections.singletonMap;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.base.Converter;

 * limitations under the License.
 */

package com.google.common.collect.testing;

import static java.lang.Math.max;
import static java.util.Arrays.asList;
import static java.util.Collections.singletonMap;
import static java.util.Collections.sort;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertFalse;
import static junit.framework.Assert.assertTrue;

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) {

 * limitations under the License.
 */

package com.google.common.collect.testing;

import static java.lang.Math.max;
import static java.util.Arrays.asList;
import static java.util.Collections.singletonMap;
import static java.util.Collections.sort;
import static junit.framework.Assert.assertEquals;
import static junit.framework.Assert.assertFalse;
import static junit.framework.Assert.assertTrue;