# a2 <- tempfile()
# z2 <- createPool(basename(a2), 
#                            dirname(a2))[[1]]
# z3 <- pool::poolCheckout(z2)
# 
# DBI::dbListTables(z3)
# 
# 
# test_that("new DB is empty", {
#   expect_equal(character(0), 
#                DBI::dbListTables(z3))
# })
# 
# 
# sql_create_xml_table(z3)
# a <- DBI::dbListFields(z3, "xml")
# 
# test_that("new DB has xml table", {
#   expect_equal("xml", 
#                DBI::dbListTables(z3))
#   
#   expect_identical("xml_hashxmlmanufacturermodelionizationanalyzerdetectorinstrument_metafile",
#                     paste0(a, collapse = ""))
#   
# })
#