*            The property name. Must not be {@literal null} or empty string
     * @return Whether the {@link PropertyDesc} exists
     */
    boolean hasPropertyDesc(String propertyName);

    /**
     * Returns the {@link PropertyDesc}.
     *
     * @param propertyName
     *            The property name. Must not be {@literal null} or empty string
     * @return {@link PropertyDesc}
     */

     *
     * @return The list of matching versions, never {@code null}. An empty list indicates
     *         no versions matched the requested range.
     */
    @Nonnull
    List<Version> getVersions();

    /**
     * Gets the lowest version matching the requested range.
     *
     * @return An Optional containing the lowest matching version, or empty Optional if no versions
     *         matched the requested range
     */

  public void testConcat() {
    assertThat(Doubles.concat()).isEqualTo(EMPTY);
    assertThat(Doubles.concat(EMPTY)).isEqualTo(EMPTY);
    assertThat(Doubles.concat(EMPTY, EMPTY, EMPTY)).isEqualTo(EMPTY);
    assertThat(Doubles.concat(ARRAY1)).isEqualTo(ARRAY1);
    assertThat(Doubles.concat(ARRAY1)).isNotSameInstanceAs(ARRAY1);
    assertThat(Doubles.concat(EMPTY, ARRAY1, EMPTY)).isEqualTo(ARRAY1);

        @Test
        @DisplayName("should create empty result")
        void shouldCreateEmptyResult() {
            UpgradeResult result = UpgradeResult.empty();

            assertTrue(result.success(), "Empty result should be successful");
            assertEquals(0, result.processedCount(), "Empty result should have no processed POMs");
            assertEquals(0, result.modifiedCount(), "Empty result should have no modified POMs");

    }

    /**
     * Returns the bundle. Returns <code>null</code> if not found.
     *
     * @param name the resource bundle name (must not be {@literal null} or empty)
     * @param locale the locale
     * @param classLoader the class loader (must not be {@literal null} or empty)
     * @return {@link ResourceBundle}
     * @see ResourceBundle#getBundle(String, Locale, ClassLoader)
     */

 */
public class LineIterator implements Iterator<String> {

    /** String object indicating that {@link #line} is empty */
    protected static final String EMPTY = new String();

    /** {@link BufferedReader} */
    protected final BufferedReader reader;

    /** The line that has been read */
    protected String line = EMPTY;

    /**
     * Returns an {@link Iterable} that wraps a {@link LineIterator} for use in enhanced for-loops.

        }
    }

    /**
     * Test encode with empty byte array
     *
     * @throws Exception
     */
    public void testEncode_EmptyArray() throws Exception {
        final String result = Base64Util.encode(new byte[0]);
        assertEquals("Empty array should return empty string", "", result);
    }

    /**
     * Test encode with null returns empty string
     *
     * @throws Exception
     */

            pacString.check(testString);
        }, "A PACDecodingException should be thrown for a non-empty string with a zero pointer.");

        // Verify the exception message
        assertEquals("Non-empty string", exception.getMessage(), "The exception message is not correct.");
    }

    /**

        // Mock successful but empty response
        when(treeHandle.send(any(), any(), (RequestParam[]) any())).thenAnswer(invocation -> {
            // The response is the second argument
            Object response = invocation.getArgument(1);
            // Return it unchanged (which will have default values = empty results)
            return response;
        });

     * from the collection obtained by {@link #getModelIds()}. As a special case, an empty string can be used as the
     * identifier for the super POM.
     *
     * @param modelId The identifier of the model whose active profiles should be retrieved, must not be {@code null}.
     * @return The active profiles of the model or an empty list if none or {@code null} if the specified model id does
     *         not refer to a known model.