assertThrows(IllegalArgumentException.class, () -> HashCode.fromString(""));
    assertThrows(IllegalArgumentException.class, () -> HashCode.fromString("7"));
    HashCode unused = HashCode.fromString("7f");
  }

  public void testFromStringFailsWithOddLengthInput() {
    assertThrows(IllegalArgumentException.class, () -> HashCode.fromString("7f8"));
  }

  public void testIntWriteBytesTo() {

    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));

    @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);

        CIFSException ex = assertThrows(CIFSException.class, () -> ctx.calculateMIC(data));
        assertTrue(ex.getMessage().contains("Failed to calculate MIC"));
    }

    @Test
    @DisplayName("calculateMIC with null data throws NPE")
    void calculateMIC_nullData() {
        assertThrows(NullPointerException.class, () -> ctx.calculateMIC(null));
    }

    @Test

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertSame;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Arrays;

    assertThat(Arrays.equals(new double[] {1.0, 0.0, 0.0}, Doubles.ensureCapacity(ARRAY1, 2, 1)))
        .isTrue();
  }

  public void testEnsureCapacity_fail() {
    assertThrows(IllegalArgumentException.class, () -> Doubles.ensureCapacity(ARRAY1, -1, 1));
    assertThrows(IllegalArgumentException.class, () -> Doubles.ensureCapacity(ARRAY1, 1, -1));
  }

  @GwtIncompatible // Double.toString returns different value in GWT.

        assertThrows(NullPointerException.class, () -> hyper.encode(null));
    }

    /**
     * Ensure decode throws NPE when passed a null buffer.
     */
    @Test
    @DisplayName("Decode with null buffer throws NullPointerException")
    public void testDecodeNullBuffer() throws NdrException {
        NdrHyper hyper = new NdrHyper(0L);

  @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 testSeparatorSameAsPadChar() {
    assertThrows(IllegalArgumentException.class, () -> base64().withSeparator("=", 3));

    assertThrows(
        IllegalArgumentException.class, () -> base64().withPadChar('#').withSeparator("!#!", 3));
  }

  public void testAtMostOneSeparator() {
    BaseEncoding separated = base64().withSeparator("\n", 3);

  }

  public void testGet_bad() {
    ImmutableLongArray iia = ImmutableLongArray.of(0, 1, 3);
    assertThrows(IndexOutOfBoundsException.class, () -> iia.get(-1));
    assertThrows(IndexOutOfBoundsException.class, () -> iia.get(3));

    ImmutableLongArray sub = iia.subArray(1, 2);
    assertThrows(IndexOutOfBoundsException.class, () -> sub.get(-1));
  }

  public void testIndexOf() {