/** The underlying map that this DocMap wraps */
    private final Map<String, Object> parent;

    /**
     * Constructor that creates a DocMap wrapping the given parent map.
     *
     * @param parent the map to wrap and delegate operations to
     */
    public DocMap(final Map<String, Object> parent) {
        this.parent = parent;
    }

    /**
     * Returns the number of key-value mappings in this map.
     *

    /**
     * The version of the extension.
     */
    private String version;

    /**
     * The class loading strategy: 'self-first' (the default),
     * 'parent-first' (loads classes from the parent, then from the
     * extension) or 'plugin' (follows the rules from extensions
     * defined as plugins).
     */
    private String classLoadingStrategy = "self-first";

    // -----------/

        assertTrue(exception.getMessage().contains("invalid"));
        verify(treeHandle, never()).acquire();
    }

    @Test
    @DisplayName("Constructor should handle null parent")
    void testConstructor_NullParent_ThrowsNPE() {
        // When & Then: Null parent should cause NullPointerException

<project>
  <parent>
    <artifactId>p0</artifactId>
    <groupId>maven-t09</groupId>
    <version>1.0</version>
  </parent>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-t09</groupId>
  <artifactId>p1</artifactId>
  <packaging>pom</packaging>
  <name>p1</name>
  <version>1.0</version>
  <scm>
    <url>scm-url</url>
  </scm>

  <dependencies>

    <dependency>
      <groupId>maven-test</groupId>

<a href="fess-crawler-lasta/" title="fess-crawler-lasta/">fess-crawler-lasta/</a>                                              -         -      
<a href="fess-crawler-parent/" title="fess-crawler-parent/">fess-crawler-parent/</a>                                             -         -      

        // Test with normal URLs
        String parentUrl = "http://example.com/parent";
        String url = "http://example.com/child";
        ContentNotFoundException exception = new ContentNotFoundException(parentUrl, url);

        assertNotNull(exception);
        assertEquals("Not Found: http://example.com/child Parent: http://example.com/parent", exception.getMessage());
        assertNull(exception.getCause());
    }

    @Test

<project>
  <parent>
    <artifactId>p0</artifactId>
    <groupId>maven-t09</groupId>
    <version>1.0</version>
  </parent>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-t09</groupId>
  <artifactId>p2</artifactId>
  <packaging>pom</packaging>
  <name>p2</name>
  <version>1.0</version>
  <scm>
    <url>scm-url</url>
  </scm>

  <dependencies>

    <dependency>
      <groupId>maven-test</groupId>

<project>
  <parent>
    <artifactId>p0</artifactId>
    <groupId>maven-t10</groupId>
    <version>1.0</version>
  </parent>
  <modelVersion>4.0.0</modelVersion>
  <groupId>maven-t10</groupId>
  <artifactId>p1</artifactId>
  <packaging>pom</packaging>
  <name>p1</name>
  <version>1.0</version>
  <scm>
    <url>scm-url</url>
  </scm>

  <dependencies>

    <dependency>
      <groupId>maven-test</groupId>

                }
                int parent = idx - 1;
                while (parent >= 0 && result.charAt(parent) == '/') {
                    parent--;
                }
                parent = result.lastIndexOf('/', parent);
                if (parent < 0) {
                    result = result.substring(idx + 4);
                } else {
                    result = result.substring(0, parent) + result.substring(idx + 3);

    </description>
  </expression>
  <expression>
    <syntax>project.parent</syntax>
    <configuration>
      <![CDATA[
<parent>
  <groupId>project.group</groupId>
  <artifactId>project-artifact</artifactId>
  <version>0.0.0.0</version>
</parent>
    ]]></configuration>
    <description> This is the MavenProject instance for the parent of the current POM.
    </description>
  </expression>
  <expression>