code: public static EmbeddedPostgresTestDatabaseRule embeddedDatabaseRule(@Nonnull final URI baseUri, final String... personalities)
      {
          return new EmbeddedPostgresTestDatabaseRule(baseUri, personalities);
      }
docs: Returns a {@link TestRule} to create a Postgres cluster, shared amongst all test cases in this JVM.
  The rule contributes {@link Config} switches to configure each test case to get its own database.