def METHOD_NAME(self):
    """verify that all resolvers of the admin realm are labeled as admin
    - we query all resolvers, which are the def, other and default admin
      resolver
    - all of them but not the admin resolver will be added to the admin
      realm. They now should have all the label 'admin'.
    - finally we have to drop all new defined admin resolvers from the
      admin realm. Otherwise the delete_all_resolvers() will fail.
      This is done by defining the admin realm to only contain the
      admin resolver
    """
    admin_realm_name = current_app.config["ADMIN_REALM_NAME"]
    fallback_admin_resolver_name = current_app.config[
        "ADMIN_RESOLVER_NAME"
    ]
    # ----------------------------------------------------------------- --
    # query all defined resolvers
    response = self.make_system_request("getResolvers", params={})
    resolvers = response.json["result"]["value"]
    resolver_specs = set()
    for resolver_name, resolver_description in resolvers.items():
        # preserve the admin resolver spec for later
        if resolver_name == fallback_admin_resolver_name:
            fallback_admin_resolver_spec = resolver_description["spec"]
            assert resolver_description["immutable"], resolvers
            continue
        resolver_specs.add(resolver_description["spec"])
        assert not resolver_description["immutable"], resolvers
    # ----------------------------------------------------------------- --
    # create the admin realm with the identified resolver
    params = {
        "realm": admin_realm_name,
        "resolvers": ",".join(resolver_specs),
    }
    response = self.make_system_request("setRealm", params=params)
    assert response.json["result"]["value"], response
    # ----------------------------------------------------------------- --
    # verify that every resolver other than the default admin resolver
    # now contains the admin label
    response = self.make_system_request("getResolvers", params={})
    resolvers = response.json["result"]["value"]
    for resolver_name, resolver_description in resolvers.items():
        # the default admin resolver is now no more an admin resolver
        if resolver_name == fallback_admin_resolver_name:
            continue
        assert resolver_description["admin"], resolver_description
    # ----------------------------------------------------------------- --
    # finally reset the admin realm
    params = {
        "realm": admin_realm_name,
        "resolvers": fallback_admin_resolver_spec,
    }
    response = self.make_system_request(
        "setRealm",
        params=params,
        auth_resolver=fallback_admin_resolver_spec,
    )
    assert response.json["result"]["value"], response