tests/testthat/helper-initialize.R

In kevinykuo/sparklygraphs: R interface for GraphFrames

# helper functions from sparklyr tests
# https://github.com/rstudio/sparklyr/blob/master/tests/testthat/helper-initialize.R
testthat_spark_connection <- function(version = NULL) {

  # generate connection if none yet exists
  connected <- FALSE
  if (exists(".testthat_spark_connection", envir = .GlobalEnv)) {
    sc <- get(".testthat_spark_connection", envir = .GlobalEnv)
    connected <- sparklyr::connection_is_open(sc)
  }

  if (!connected) {
    version <- version %||% Sys.getenv("SPARK_VERSION", unset = "2.1.0")
    setwd(tempdir())
    sc <- sparklyr::spark_connect(master = "local", version = version)
    assign(".testthat_spark_connection", sc, envir = .GlobalEnv)
  }

  # retrieve spark connection
  get(".testthat_spark_connection", envir = .GlobalEnv)
}

testthat_tbl <- function(name) {
  sc <- testthat_spark_connection()
  tbl <- tryCatch(dplyr::tbl(sc, name), error = identity)
  if (inherits(tbl, "error")) {
    data <- eval(as.name(name), envir = parent.frame())
    tbl <- dplyr::copy_to(sc, data, name = name)
  }
  tbl
}

skip_unless_verbose <- function(message = NULL) {
  message <- message %||% "Verbose test skipped"
  verbose <- Sys.getenv("SPARKLYR_TESTS_VERBOSE", unset = NA)
  if (is.na(verbose)) skip(message)
  invisible(TRUE)
}

test_requires <- function(...) {

  for (pkg in list(...)) {
    if (!require(pkg, character.only = TRUE, quietly = TRUE)) {
      fmt <- "test requires '%s' but '%s' is not installed"
      skip(sprintf(fmt, pkg, pkg))
    }
  }

  invisible(TRUE)
}

sc <- tryCatch(
  testthat_spark_connection(version = "2.0.0"),
  error = function(e) {
    sparklyr::spark_install(version = "2.0.0")
    testthat_spark_connection(version = "2.0.0")
  }
)