getTestData <- function() {
  ingredient_drug_records <- tibble::tibble(
    drug_exposure_id = c("1", "2", "3", "4", "5"),
    drug_concept_id = c("1", "1", "2", "2", "3"),
    drug = c("x", "x", "x", "x", "x"),
    ingredient_concept_id = c("1", "1", "1", "1", "1"),
    ingredient = c("a", "a", "a", "a", "a"),
    person_id = c("1", "2", "3", "4", "5"),
    drug_type_concept_id = c("1", "1", "1", "1", "1"),
    route_concept_id = c("1", "2", "3", "4", "5"),
    lot_number  = c("1", "2", "3", "4", "5"),
    provider_id = c("1", "2", "3", "4", "5"),
    visit_occurrence_id= c("1", "2", "3", "4", "5"),
    visit_detail_id= c("1", "2", "3", "4", "5"),
    drug_source_value= c("1", "2", "3", "4", "5"),
    drug_source_concept_id= c("40162522", "1127078", "1127078", "1127078", "1127433"),
    route_source_value= c("1", "2", "3", "4", "5"),
    dose_unit_source_value= c("1", "2", "3", "4", "5"),
    drug_exposure_start_date = c(
      as.Date("2010-01-01"), as.Date("2011-01-01"),
      as.Date("2012-01-01"), NA,
      as.Date("2013-01-01")),
    drug_exposure_end_date = c(
      as.Date("2011-01-01"), NA,
      as.Date("2013-01-01"), as.Date("2010-01-01"),
      as.Date("2014-01-01")),
    verbatim_end_date = c(
      as.Date("2011-01-01"), NA,
      as.Date("2013-01-01"), as.Date("2010-01-01"),
      as.Date("2014-01-01")),
    days_supply = c(NA,NA,NA,NA,366),
    quantity = c(10, 20, 30, 40, 50),
    stop_reason = rep("", 5),
    refills = rep(1, 5),
    sig = rep("", 5))

  mockDrugExposure(ingredient_drug_records = ingredient_drug_records)
}

test_that("getDrugSourceConcepts", {
  cdm <- getTestData()

  result <- getDrugSourceConcepts(cdm, "ingredient_drug_records") %>%
    dplyr::collect()

  expect_equal(nrow(result), 5)
  expect_equal(ncol(result), 11)
  expect_equal(colnames(result), c("ingredient_concept_id", "ingredient", "drug_concept_id", "drug",
                                   "drug_source_concept_id", "drug_source",
                                   "drug_source_value", "n_records", "n_sample", "n_person",
                                   "proportion_records"))
  expect_true(all(result$drug_source %in% as.character(c("acetaminophen 325 MG Oral Tablet",
                                                         "acetaminophen 750 MG / Hydrocodone Bitartrate",
                                                         "acetaminophen 325 MG / Oxycodone Hydrochloride"))))
  expect_equal(result$proportion_records, c(1/5, 1/5, 1/5, 1/5, 1/5))

  DBI::dbDisconnect(attr(cdm, "dbcon"), shutdown = TRUE)
})