.of(-1.375);
    assertThat(DoubleMath.mean(ImmutableList.of(1.1))).isWithin(1.0e-10).of(1.1);
    assertThrows(IllegalArgumentException.class, () -> DoubleMath.mean(ImmutableList.<Double>of()));
    assertThrows(
        IllegalArgumentException.class, () -> DoubleMath.mean(ImmutableList.of(Double.NaN)));
    assertThrows(
        IllegalArgumentException.class,
        () -> DoubleMath.mean(ImmutableList.of(Double.POSITIVE_INFINITY)));

  }

  public void testToOptionalNull() {
    Stream<@Nullable Object> stream = Stream.of((Object) null);
    assertThrows(NullPointerException.class, () -> stream.collect(toOptional()));
  }

  public void testToOptionalMultiple() {
    IllegalArgumentException expected =
        assertThrows(IllegalArgumentException.class, () -> Stream.of(1, 2).collect(toOptional()));
    assertThat(expected).hasMessageThat().contains("1, 2");

    assertThrows(UnsupportedOperationException.class, () -> unmod.put(4, "four"));
    assertThrows(UnsupportedOperationException.class, () -> unmod.forcePut(4, "four"));
    assertThrows(UnsupportedOperationException.class, () -> unmod.putAll(singletonMap(4, "four")));
    assertThrows(UnsupportedOperationException.class, () -> unmod.replaceAll((k, v) -> v));

import static com.google.common.collect.testing.features.CollectionSize.SEVERAL;
import static com.google.common.collect.testing.features.CollectionSize.ZERO;
import static com.google.common.collect.testing.google.ReflectionFreeAssertThrows.assertThrows;
import static java.util.Arrays.asList;

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

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

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

        .of(-1.375);
    assertThat(DoubleMath.mean(ImmutableList.of(1.1))).isWithin(1.0e-10).of(1.1);
    assertThrows(IllegalArgumentException.class, () -> DoubleMath.mean(ImmutableList.<Double>of()));
    assertThrows(
        IllegalArgumentException.class, () -> DoubleMath.mean(ImmutableList.of(Double.NaN)));
    assertThrows(
        IllegalArgumentException.class,
        () -> DoubleMath.mean(ImmutableList.of(Double.POSITIVE_INFINITY)));

    @Test
    @DisplayName("Test invalid session ID handling")
    public void testInvalidSessionIdHandling() {
        assertThrows(CIFSException.class, () -> {
            preauthService.initializeSession(null, new byte[32], PreauthIntegrityService.HASH_ALGO_SHA512);
        });

        assertThrows(CIFSException.class, () -> {
            preauthService.initializeSession("", new byte[32], PreauthIntegrityService.HASH_ALGO_SHA512);

  }

  public <T> void testWhere_incompatibleGenericArrayMapping() {
    assertThrows(
        IllegalArgumentException.class,
        () -> new TypeResolver().where(new TypeCapture<T[]>() {}.capture(), String.class));
  }

  public <T> void testWhere_incompatibleParameterizedTypeMapping() {
    assertThrows(
        IllegalArgumentException.class,

  @ListFeature.Require(SUPPORTS_ADD_WITH_INDEX)
  public void testAddAllAtIndex_nullCollectionReference() {
    assertThrows(NullPointerException.class, () -> getList().addAll(0, null));
    expectUnchanged();
  }

  @ListFeature.Require(SUPPORTS_ADD_WITH_INDEX)
  public void testAddAllAtIndex_negative() {
    assertThrows(
        IndexOutOfBoundsException.class, () -> getList().addAll(-1, MinimalCollection.of(e3())));

  }

  public void testSampleVariance() {
    assertThrows(IllegalStateException.class, () -> emptyAccumulator.sampleVariance());
    assertThrows(
        IllegalStateException.class, () -> emptyAccumulatorByAddAllEmptyIterable.sampleVariance());
    assertThrows(
        IllegalStateException.class, () -> emptyAccumulatorByAddAllEmptyStats.sampleVariance());