public default String getWorkingDirectory() {
        return TestHelper.makeTestDataDirectory(this.getClass(), "graph-provider-data");
    }
Helper method for those build {@link GraphProvider} implementations that need a standard working directory
for tests (e.g. graphs that persist data to disk). Typically, there is no need to override the default
behavior of this method and if it is overridden, it is usually best to continue to use the {@link TestHelper}
to produce the working directory as it will create the path in the appropriate build directories.
@return UNIX-formatted absolute directory path
gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/GraphProvider.java