Path basePath = Paths.get("/tmp");
        ModelSource.ModelLocator locator = mock(ModelSource.ModelLocator.class);
        Path resolvedPath = Paths.get("/tmp/subproject/pom.xml");
        when(locator.locateExistingPom(any(Path.class))).thenReturn(resolvedPath);

        Sources.BuildPathSource source = (Sources.BuildPathSource) Sources.buildSource(basePath);
        ModelSource resolved = source.resolve(locator, "subproject");

         * @return the path to the located POM file, or null if no POM can be found
         * @throws NullPointerException if project is null
         */
        @Nullable
        Path locateExistingPom(@Nonnull Path project);
    }

    /**
     * Resolves a relative path to another POM file using the provided model locator.
     * This method is specifically used to locate POM files for subprojects or related

            String norm = relative.replace('\\', File.separatorChar).replace('/', File.separatorChar);
            Path path = getPath().getParent().resolve(norm);
            Path relatedPom = locator.locateExistingPom(path);
            if (relatedPom != null) {
                return new BuildPathSource(relatedPom);
            }
            return null;
        }

        @Override

                String norm = relative.replace('\\', File.separatorChar).replace('/', File.separatorChar);
                Path path = parent.resolve(norm);
                Path relatedPom = modelLocator.locateExistingPom(path);
                if (relatedPom != null) {
                    return Sources.buildSource(relatedPom);
                }
                return null;
            }
        };