test(SimGR): add tests when there are NA in Qobs on the whole period or on a sub-period

- add 'testthat' in the 'Suggests' list of the DESCRIPTION file
Refs #44

DESCRIPTION

@@ -26,6 +26,7 @@ Imports:
 Suggests:
   knitr,
   rmarkdown,
+  testthat,
   htmlwidgets (>= 1.5.3)
 Description: Add-on package to the 'airGR' package that simplifies its use and is aimed at being used for teaching hydrology. The package provides 1) three functions that allow to complete very simply a hydrological modelling exercise 2) plotting functions to help students to explore observed data and to interpret the results of calibration and simulation of the GR ('Génie rural') models 3) a 'Shiny' graphical interface that allows for displaying the impact of model parameters on hydrographs and models internal variables.
 License: GPL-2

tests/testthat.R

+library(testthat)
+library(airGRteaching)
+
+
+test_check("airGRteaching")

tests/testthat/test-SimGR.R

+context("SimGR")
+
+# --------
+
+data(L0123001, package = "airGR")
+
+BasinObsSubNA <- BasinObs[, c("DatesR", "P", "E", "Qmm", "T")]
+BasinObsSubNA[BasinObsSubNA$DatesR >= "1994-01-01", ]$Qmm <- NA
+BasinObsTotNA <- BasinObsSubNA[BasinObsSubNA$DatesR >= "1994-01-01", ]
+
+PrepSubNA <- PrepGR(ObsDF = BasinObsSubNA, HydroModel = "GR4J", CemaNeige = FALSE)
+PrepTotNA <- PrepGR(ObsDF = BasinObsTotNA, HydroModel = "GR4J", CemaNeige = FALSE)
+
+# --------
+
+test_that("NA on a sub-period", {
+  expect_message(
+    object   = SimGR(PrepGR = PrepSubNA, Param = c(270.426, 0.984, 108.853, 2.149), EffCrit = "KGE2",
+                     WupPer = c("1994-01-01", "1994-12-31"), SimPer = c("1995-01-01", "1998-12-31"))
+    ,
+    expected = "\"PrepGR\" does not contain any Qobs values on \"SimPer\". The efficiency criterion is not computed",
+  )
+})
+
+# ----
+
+test_that("NA on the total period", {
+  expect_warning(
+    object   = SimGR(PrepGR = PrepTotNA, Param = c(270.426, 0.984, 108.853, 2.149), EffCrit = "KGE2",
+                     WupPer = c("1994-01-01", "1994-12-31"), SimPer = c("1995-01-01", "1998-12-31"))
+    ,
+    expected = "\"PrepGR\" does not contain any Qobs values. The efficiency criterion is not computed",
+  )
+})