test_metar_day.R
In pmetar: Processing METAR Weather Reports

context("METAR day")

x1 <- "EPWA 281830Z 18009KT 140V200 9999 SCT037 03/M01 Q1008 NOSIG"
x2 <- "CYUL 281800Z 13008KT 30SM BKN240 01/M06 A3005 RMK CI5 SLP180"
x3 <- "201711271930 METAR LEMD 271930Z 02002KT CAVOK 04/M03 Q1025 NOSIG= NOSIG="
x4 <- "201905121244 METAR KDCA 121244Z 05010KT 1 3/4SM R01/6000VP6000FT -RA BR OVC007 14/12 A2978 RMK AO2 P0002 T01390122"
x5 <- "201905121244 SPECI KDCA 121244Z 05010KT 2 1/4SM R01/6000VP6000FT -RA BR OVC007 14/12 A2978 RMK AO2 P0002 T01390122"
x6 <- "CYWG 172000Z 30015G25KT 3/4SM R36/4000FT/D -SN BLSN BKN008 OVC040 M05/M08 A2992 REFZRA WS RWY36 RMK SF5NS3 SLP134"
x7 <- "METAR KJFK 282355Z AUTO 13009KT 10SM -RA SCT028 SCT035 BKN079 23/20 A2972 RMK T02300200  LTG DSNT SE-SW! MADISHF"

x <- c(x1, x2, x3, x4, x5, x6, x7)

dx <- data.frame(metar = x)

test_that("Check days", {
  expect_equal(metar_day(x1), 28)
  expect_equal(metar_day(x2), 28)
  expect_equal(metar_day(x3), 27)
  expect_equal(metar_day(x4), 12)
  expect_equal(metar_day(x5), 12)
  expect_equal(metar_day(x6), 17)
  expect_equal(metar_day(x7), 28)
  expect_equal(metar_day(x), c(28, 28, 27, 12, 12, 17, 28))
  expect_equal(metar_day(dx$metar), c(28, 28, 27, 12, 12, 17, 28))
})

x8 <- "EPWA 0281830Z 18009KT 140V200 9999 SCT037 03/M01 Q1008 NOSIG"
x9 <- "CYU 281800Z 13008KT 30SM BKN240 01/M06 A3005 RMK CI5 SLP180"
x10 <- "201711271930 METAR LEMD 271930 02002KT CAVOK 04/M03 Q1025 NOSIG= NOSIG="

test_that("Incorrect METAR reports", {
  expect_equal(is.na(metar_day(x8)), TRUE)
  expect_equal(is.na(metar_day(x9)), TRUE)
  expect_equal(is.na(metar_day(x10)), TRUE)
})

dx <- data.frame(metar = c(x1, x2, x3, x4, x5, x6, x7, x8, x9, x10))

test_that("Correct and incorrect METAR reports", {
  expect_equal(metar_day(dx$metar), c(28, 28, 27, 12, 12, 17, 28, NA, NA, NA))
})

dxt <- tibble::as_tibble(dx)

test_that("Check invalid input format", {
  expect_error(metar_day(dx))
  expect_error(metar_day(dxt))
})