assertTrue(xmlOutput.contains("<dependency>"), "Should contain dependency element");
        assertTrue(xmlOutput.contains("<groupId>org.junit.jupiter</groupId>"), "Should contain groupId");
        assertTrue(xmlOutput.contains("<artifactId>junit-jupiter</artifactId>"), "Should contain artifactId");
        assertTrue(xmlOutput.contains("<version>5.9.0</version>"), "Should contain version");

        // Test toString
        String toString = request1.toString();
        assertTrue(toString.contains("coordinates="), "Expected " + toString + " to contain " + "coordinates=");
        assertTrue(toString.contains("repositories="), "Expected " + toString + " to contain " + "repositories=");
    }

    @Test
    void testRequestTraceIntegration() {
        Session session = mock(Session.class);

        assertEquals(3, selectors.size());
        assertTrue(selectors.contains(":module-a"), "Expected selectors " + selectors + " to contain :module-a");
        assertTrue(selectors.contains(":module-b"), "Expected selectors " + selectors + " to contain :module-b");
        assertTrue(selectors.contains(":module-c"), "Expected selectors " + selectors + " to contain :module-c");
    }

    @Test

  }

  @Override
  protected void expectMissing(Entry<K, V>... entries) {
    for (Entry<K, V> entry : entries) {
      assertFalse("Should not contain entry " + entry, actualContents().contains(entry));
      assertFalse(
          "Should not contain key " + entry.getKey() + " mapped to value " + entry.getValue(),
          equal(getMap().get(entry.getKey()), entry.getValue()));
    }
  }

        // Verify both includes are present
        assertEquals(2, resource.getIncludes().size(), "Should have two includes");
        assertTrue(resource.getIncludes().contains("*.xml"), "Should contain *.xml");
        assertTrue(resource.getIncludes().contains("*.properties"), "Should contain *.properties");

        // Verify persistence
        Resource resourceAfter = project.getResources().get(0);

      BiMap<V, K> inv = getMap().inverse();
      assertFalse(
          "Inverse should not contain entry " + reversed, inv.entrySet().contains(reversed));
      assertFalse(
          "Inverse should not contain key " + reversed.getKey(),
          inv.containsKey(reversed.getKey()));
      assertFalse(
          "Inverse should not contain value " + reversed.getValue(),
          inv.containsValue(reversed.getValue()));
      /*

                "Expected " + cProjects + " to contain " + ProjectDependencyGraphStub.C);
        assertTrue(
                cProjects.contains(ProjectDependencyGraphStub.B),
                "Expected " + cProjects + " to contain " + ProjectDependencyGraphStub.B);
    }

        assertTrue(
                message.contains("3 problems were encountered while processing the POMs (2 errors)"),
                "Message should contain problem count and error count");

        assertTrue(message.contains("[com.example:project1:1.0]"), "Message should contain project1 identifier");

        assertTrue(message.contains("[com.example:project2:1.0]"), "Message should contain project2 identifier");

        assertTrue(

  }

  @Override
  protected void expectMissing(Entry<K, V>... entries) {
    for (Entry<K, V> entry : entries) {
      assertFalse("Should not contain entry " + entry, actualContents().contains(entry));
      assertFalse(
          "Should not contain key " + entry.getKey() + " mapped to value " + entry.getValue(),
          equal(getMap().get(entry.getKey()), entry.getValue()));
    }
  }

Let's first see how the normal API app would look like before adding the callback.

It will have a *path operation* that will receive an `Invoice` body, and a query parameter `callback_url` that will contain the URL for the callback.

This part is pretty normal, most of the code is probably already familiar to you:

{* ../../docs_src/openapi_callbacks/tutorial001_py310.py hl[7:11,34:51] *}

/// tip