text: ##########################################################################
  #
  # pgAdmin 4 - PostgreSQL Tools
  #
  # Copyright (C) 2013 - 2018, The pgAdmin Development Team
  # This software is released under the PostgreSQL Licence
  #
  ##########################################################################
  
  import uuid
  
  from pgadmin.browser.server_groups.servers.databases.schemas.tables.tests \
      import utils as tables_utils
  from pgadmin.browser.server_groups.servers.databases.schemas.tests import \
      utils as schema_utils
  from pgadmin.browser.server_groups.servers.databases.tests import utils as \
      database_utils
  from pgadmin.utils.route import BaseTestGenerator
  from regression import parent_node_dict
  from regression.python_test_utils import test_utils as utils
  from . import utils as exclusion_utils
  
  
  class ExclusionConstraintDeleteTestCase(BaseTestGenerator):
      """This class will delete the existing exclusion constraint of table."""
      scenarios = [
          ('Delete Exclusion Constraint Node URL',
           dict(url='/browser/exclusion_constraint/obj/'))
      ]
  
      def setUp(self):
          self.db_name = parent_node_dict["database"][-1]["db_name"]
          schema_info = parent_node_dict["schema"][-1]
          self.server_id = schema_info["server_id"]
          self.db_id = schema_info["db_id"]
          db_con = database_utils.connect_database(self, utils.SERVER_GROUP,
                                                   self.server_id, self.db_id)
          if not db_con['data']["connected"]:
              raise Exception("Could not connect to database to add a table.")
          self.schema_id = schema_info["schema_id"]
          self.schema_name = schema_info["schema_name"]
          schema_response = schema_utils.verify_schemas(self.server,
                                                        self.db_name,
                                                        self.schema_name)
          if not schema_response:
              raise Exception("Could not find the schema to add a table.")
          self.table_name = "table_exclusion_%s" % (str(uuid.uuid4())[1:8])
          self.table_id = tables_utils.create_table(self.server, self.db_name,
                                                    self.schema_name,
                                                    self.table_name)
          self.index_name = "test_exclusion_delete_%s" % (str(uuid.uuid4())[1:8])
          self.index_id = exclusion_utils.create_exclusion_constraint(
              self.server, self.db_name, self.schema_name, self.table_name,
              self.index_name
          )
  
      def runTest(self):
          """This function will delete exclusion constraint."""
          index_response = exclusion_utils.verify_exclusion_constraint(
              self.server, self.db_name, self.index_name)
          if not index_response:
              raise Exception("Could not find the constraint to delete.")
          response = self.tester.delete(self.url + str(utils.SERVER_GROUP) +
                                        '/' + str(self.server_id) + '/' +
                                        str(self.db_id) + '/' +
                                        str(self.schema_id) + '/' +
                                        str(self.table_id) + '/' +
                                        str(self.index_id),
                                        follow_redirects=True)
          self.assertEquals(response.status_code, 200)
  
          index_response = exclusion_utils.verify_exclusion_constraint(
              self.server, self.db_name, self.index_name)
          if index_response:
              raise Exception("Constraint is not deleted.")
  
      def tearDown(self):
          # Disconnect the database
          database_utils.disconnect_database(self, self.server_id, self.db_id)
  