assertNotNull(impl, "Implementation instance should not be null");
        assertTrue(SessionSetupHandler.class.isInstance(impl), "Instance should be assignable to interface");
        assertTrue(SessionSetupHandler.class.isAssignableFrom(impl.getClass()), "Type should be assignable");
    }

    @Test
    @DisplayName("Edge: null is not an instance of the interface")
    void testNullIsNotInstance() {
        // Assert

        SmbTreeImpl unwrapped = tree.unwrap(SmbTreeImpl.class);
        assertEquals(tree, unwrapped);
        // Test unwrapping to a non-assignable type should fail
        assertThrows(ClassCastException.class, () -> {
            // Create a mock class that extends SmbTree but is not assignable from SmbTreeImpl
            class CustomSmbTree extends SmbTreeImpl {
                CustomSmbTree() {

        when(config.getPid()).thenReturn(12345);
        when(config.getSendBufferSize()).thenReturn(65536);

        target = new SmbPipeHandleImpl(pipe);
    }

    @Test
    @DisplayName("unwrap returns self for assignable type; throws for incompatible and null")
    void testUnwrap() {
        // Happy path: unwrap to concrete type
        SmbPipeHandleImpl unwrapped = target.unwrap(SmbPipeHandleImpl.class);

        }
    }

    @Nested
    @DisplayName("IOException Compatibility Tests")
    class IOExceptionCompatibilityTests {

        @Test
        @DisplayName("Should be assignable to IOException")
        void testIsIOException() {
            TransportException exception = new TransportException("Test");

            assertTrue(exception instanceof IOException);

defined type while the latter is a type literal
(but they are still <a href="#Assignability">assignable</a>).
</p>

<h3 id="Assignability">Assignability</h3>

<p>
A value <code>x</code> of type <code>V</code> is <i>assignable</i> to a <a href="#Variables">variable</a> of type <code>T</code>
("<code>x</code> is assignable to <code>T</code>") if one of the following conditions applies:
</p>

<ul>
<li>

            assertEquals("DOM", sid.getDomainName());
            assertEquals("alice", sid.getAccountName());
        }

        @Test
        @DisplayName("unwrap returns this for assignable type; otherwise throws ClassCastException")
        void testUnwrap() throws Exception {
            SID sid = new SID("S-1-5-21-1");
            // Happy path
            assertSame(sid, sid.unwrap(SID.class));

@GwtCompatible
@NullMarked
public abstract class MapInterfaceTest<K extends @Nullable Object, V extends @Nullable Object>
    extends TestCase {

  /** A key type that is not assignable to any classes but Object. */
  private static final class IncompatibleKeyType {
    @Override
    public String toString() {
      return "IncompatibleKeyType";
    }
  }

  protected final boolean supportsPut;

  }

  public void testisSupertypeOf_resolved() {
    assertFalse(Assignability.of().isAssignable());
    assertTrue(new Assignability<Integer, Integer>() {}.isAssignable());
    assertTrue(new Assignability<Integer, Object>() {}.isAssignable());
    assertFalse(new Assignability<Integer, String>() {}.isAssignable());
    TypeTokenTest.<Number, Integer>assignabilityTestWithTypeVariables();
  }

@GwtCompatible
@NullMarked
public abstract class MapInterfaceTest<K extends @Nullable Object, V extends @Nullable Object>
    extends TestCase {

  /** A key type that is not assignable to any classes but Object. */
  private static final class IncompatibleKeyType {
    @Override
    public String toString() {
      return "IncompatibleKeyType";
    }
  }

  protected final boolean supportsPut;

		} else {
			reflectV := reflect.ValueOf(v)
			// Optimal value type acquisition for v
			reflectValType := reflectV.Type()

			if reflectValType.AssignableTo(field.FieldType) {
				if reflectV.Kind() == reflect.Ptr && reflectV.Elem().Kind() == reflect.Ptr {
					reflectV = reflect.Indirect(reflectV)
				}
				field.ReflectValueOf(ctx, value).Set(reflectV)
				return