assertEquals("gmail.com", hp.getHost());
    assertTrue(hp.hasPort());
    assertEquals(81, hp.getPort());

    assertThrows(IllegalArgumentException.class, () -> HostAndPort.fromParts("gmail.com:80", 81));

    assertThrows(IllegalArgumentException.class, () -> HostAndPort.fromParts("gmail.com", -1));
  }

  public void testFromHost() {

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

import java.lang.reflect.Method;
import java.math.BigInteger;
import junit.framework.TestCase;

/**
 * Tests for {@link DoubleUtils}.
 *
 * @author Louis Wasserman
 */

import static com.google.common.collect.testing.features.MapFeature.ALLOWS_NULL_KEY_QUERIES;
import static com.google.common.collect.testing.google.ReflectionFreeAssertThrows.assertThrows;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.Multimap;
import com.google.common.collect.testing.features.CollectionSize;

import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import static com.google.common.collect.testing.testers.ReflectionFreeAssertThrows.assertThrows;

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

    assertEquals(temp1, temp2);
    Files.write(ASCII, temp1, UTF_8);
    assertThrows(IllegalArgumentException.class, () -> Files.copy(temp1, temp2));
    assertEquals(ASCII, Files.toString(temp1, UTF_8));
  }

  public void testCopySameFile() throws IOException {
    File temp = createTempFile();
    Files.write(ASCII, temp, UTF_8);
    assertThrows(IllegalArgumentException.class, () -> Files.copy(temp, temp));

    ImmutableSetMultimap.Builder<String, Integer> builder = ImmutableSetMultimap.builder();
    assertThrows(NullPointerException.class, () -> builder.put(null, 1));
    assertThrows(NullPointerException.class, () -> builder.putAll(null, Arrays.asList(1, 2, 3)));
    assertThrows(NullPointerException.class, () -> builder.putAll(null, 1, 2, 3));
    assertThrows(
        NullPointerException.class, () -> builder.putAll((Multimap<String, Integer>) toPut));

    assertThrows(NullPointerException.class, () -> multimap().putAll(source));
    expectUnchanged();
  }

  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_KEYS)
  public void testPutAllRejectsNullKey() {
    Multimap<K, V> source = getSubjectGenerator().create(mapEntry(null, v0()));
    assertThrows(NullPointerException.class, () -> multimap().putAll(source));

    assertThrows(NullPointerException.class, () -> multimap().putAll(source));
    expectUnchanged();
  }

  @MapFeature.Require(value = SUPPORTS_PUT, absent = ALLOWS_NULL_KEYS)
  public void testPutAllRejectsNullKey() {
    Multimap<K, V> source = getSubjectGenerator().create(mapEntry(null, v0()));
    assertThrows(NullPointerException.class, () -> multimap().putAll(source));

  }

  public void testCorrectExceptions() {
    TestHasher hasher = new TestHasher();
    assertThrows(IndexOutOfBoundsException.class, () -> hasher.putBytes(new byte[8], -1, 4));
    assertThrows(IndexOutOfBoundsException.class, () -> hasher.putBytes(new byte[8], 0, 16));
    assertThrows(IndexOutOfBoundsException.class, () -> hasher.putBytes(new byte[8], 0, -1));
  }

    Builder<String, Integer> builder = new Builder<>();
    assertThrows(
        NullPointerException.class, () -> builder.put(immutableEntry("one", (Integer) null)));
    assertThrows(NullPointerException.class, () -> builder.put(immutableEntry((String) null, 1)));
  }

  public void testBuilderWithExpectedKeysNegative() {
    assertThrows(