async function postgresSetup(pg) {
    const setupClient = new pg.Client(CON_OBJ)

    await new Promise((resolve, reject) => {
      setupClient.connect(function (err) {
        if (err) {
          reject(err)
        }

        resolve()
      })
    })
    await runCommand(setupClient, "set client_min_messages='warning';") // suppress PG notices

    const tableDrop = `drop table if exists ${TABLE_PREPARED}`
    await runCommand(setupClient, tableDrop)

    const tableCreate = `create table ${TABLE_PREPARED} (${PK} integer primary key, ${COL} text)`
    await runCommand(setupClient, tableCreate)
    setupClient.end()
  }
Deletion of testing table if already exists,
then recreation of a testing table
@param pg