}
        }
        assertNotNull(dependencyLocation, "missing dependency");
        assertEquals(
                "org.apache.maven.its:bom:0.1", dependencyLocation.getSource().getModelId());

        InputLocation pluginLocation = null;
        for (Plugin plugin : project.getBuildPlugins()) {
            if (plugin.getKey().equals("org.apache.maven.plugins:maven-clean-plugin")) {

            indent += "  ";

            InputLocation location = plugin.getLocation("");
            if (location != null && location.getSource() != null) {
                trackingData.add(indent + location.getSource().getModelId() + " (implicit)");
                indent += "  ";
            }
        } else if (collectStepTrace != null) {
            if (collectStepTrace.getPath().get(0).getArtifact() == null) {
                return;

                        && p.getLocation("version").getSource() != null
                        && defaulModelId.equals(
                                p.getLocation("version").getSource().getModelId()))
                .distinct()
                .map(Plugin::getArtifactId) // managed by us, groupId is always o.a.m.plugins
                .collect(Collectors.toList());

        if (!unversionedPlugins.isEmpty()) {

        if (inputLocation != null && inputLocation.getSource() != null) {
            StringBuilder stringBuilder = new StringBuilder();
            stringBuilder.append(inputLocation.getSource().getModelId());
            String location = inputLocation.getSource().getLocation();
            if (location != null) {
                if (location.contains("://")) {