MapDifference<Integer, Integer> diff = Maps.difference(EMPTY, EMPTY);
    assertTrue(diff.areEqual());
    assertEquals(EMPTY, diff.entriesOnlyOnLeft());
    assertEquals(EMPTY, diff.entriesOnlyOnRight());
    assertEquals(EMPTY, diff.entriesInCommon());
    assertEquals(EMPTY, diff.entriesDiffering());
    assertEquals("equal", diff.toString());
  }

  public void testMapDifferenceEmptySingleton() {

    MapDifference<Integer, Integer> diff = Maps.difference(EMPTY, EMPTY);
    assertTrue(diff.areEqual());
    assertEquals(EMPTY, diff.entriesOnlyOnLeft());
    assertEquals(EMPTY, diff.entriesOnlyOnRight());
    assertEquals(EMPTY, diff.entriesInCommon());
    assertEquals(EMPTY, diff.entriesDiffering());
    assertEquals("equal", diff.toString());
  }

  public void testMapDifferenceEmptySingleton() {

          if ((hash1 & (1 << k)) == (hash2 & (1 << k))) {
            same[k] += 1;
          } else {
            diff[k] += 1;
          }
        }
      }
      // measure probability and assert it's within margin of error
      for (int j = 0; j < hashBits; j++) {
        double prob = (double) diff[j] / (double) (diff[j] + same[j]);
        assertThat(prob).isWithin(epsilon).of(0.50d);
      }
    }
  }

  /**

          if ((hash1 & (1 << k)) == (hash2 & (1 << k))) {
            same[k] += 1;
          } else {
            diff[k] += 1;
          }
        }
      }
      // measure probability and assert it's within margin of error
      for (int j = 0; j < hashBits; j++) {
        double prob = (double) diff[j] / (double) (diff[j] + same[j]);
        assertThat(prob).isWithin(epsilon).of(0.50d);
      }
    }
  }

  /**

        continue-on-error: true
      - name: Commit and push changes
        if: env.HAS_SECRETS == 'true'
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add -A
          if git diff --staged --quiet; then
            echo "No changes to commit"

        }
        Diff diff = DiffBuilder.compare(afterPomFile.toFile())
                .withTest(tempFile.toFile())
                .ignoreComments()
                .ignoreWhitespace()
                .build();
        assertFalse(diff.hasDifferences(), "XML files should be identical: " + diff.toString());
    }

    @Test
    void transformJarConsumerPom() throws Exception {

                    artifact.getClassifier(),
                    artifact.getExtension(),
                    null);
        }
        // Verify groupId and version, intentionally allow artifactId to differ as Maven project may be
        // multi-module with modular sources structure that provide module names used as artifactIds.
        String g1 = project.getGroupId();
        String a1 = project.getArtifactId();

 *       then as many exception-testing methods as there are exceptions the method can throw.
 *       Sometimes there are multiple tests per JSR166 method when the different "normal" behaviors
 *       differ significantly. And sometimes testcases cover multiple methods when they cannot be
 *       tested in isolation.
 *   <li>The documentation style for testcases is to provide as javadoc a simple sentence or two

     * cross-platform path behavior using JIMFS to simulate both Windows and Unix file systems.
     * This test shows how the path separator expectations differ between platforms.
     */
    @ParameterizedTest(name = "testActivatedDefaultProfileBySource[{0}]")
    @MethodSource("fileSystemConfigurations")

import static eu.maveniverse.domtrip.maven.MavenPomElements.ModelVersions.MODEL_VERSION_4_1_0;

/**
 * Base class for upgrade goals containing shared functionality.
 * Subclasses only differ in whether they save modifications to disk.
 *
 * <h2>Supported Upgrades</h2>
 *
 * <h3>Model Version Upgrades</h3>
 * <ul>
 *   <li><strong>4.0.0 → 4.1.0</strong>: Upgrades Maven 3.x POMs to Maven 4.1.0 format</li>