add tests and Travis CI configuration

.Rbuildignore

@@ -2,3 +2,7 @@
 ^\.Rproj\.user$
 ^CHANGES\.md$
 ^tools*$
+^\.travis\.yml$
+^appveyor\.yml$
+^CONDUCT\.md$
+^codecov\.yml$

.travis.yml

@@ -0,0 +1,5 @@
+# R for travis: see documentation at https://docs.travis-ci.com/user/languages/r
+
+language: R
+sudo: false
+cache: packages

DESCRIPTION

@@ -17,7 +17,9 @@ Suggests:
     knitr,
     rmarkdown,
     lubridate,
-    units
+    units,
+    testthat,
+    covr
 Author: Norwin Roosen
 Maintainer: Norwin Roosen <bugs@nroo.de>
 Description: Download data (environmental measurements, sensorstations) from the

tests/testthat.R

@@ -0,0 +1,4 @@
+library("testthat")
+library("opensensmapr")
+
+test_check("opensensmapr")

tests/testthat/test_boxes.R

@@ -0,0 +1,72 @@
+context("boxes")
+
+check_api <- function() {
+  code <- NA
+  try(code <- httr::status_code(httr::GET(osem_endpoint())))
+  if (is.na(code)) skip("API not available")
+}
+
+test_that("a list of all boxes can be retrieved and returns a sensebox data.frame", {
+  check_api()
+  
+  boxes <- osem_boxes()
+  expect_true(is.data.frame(boxes))
+  expect_true(is.factor(boxes$model))
+  expect_true(is.character(boxes$name))
+  expect_length(names(boxes), 14)
+  expect_true(any("sensebox" %in% class(boxes)))
+})
+
+test_that("a list of boxes with exposure filter returns only the requested exposure", {
+  check_api()
+  
+  boxes <- osem_boxes(exposure = "mobile")
+  expect_true(all(boxes$exposure == "mobile"))
+})
+
+test_that("a list of boxes with model filter returns only the requested model", {
+  check_api()
+  
+  boxes <- osem_boxes(model = "homeWifi")
+  expect_true(all(boxes$model == "homeWifi"))
+})
+
+test_that("box query can combine exposure and model filter", {
+  check_api()
+  
+  boxes <- osem_boxes(exposure = "mobile", model = "homeWifi")
+  expect_true(all(boxes$model == "homeWifi"))
+  expect_true(all(boxes$exposure == "mobile"))
+})
+
+test_that("a list of boxes with grouptype returns only boxes of that group", {
+  check_api()
+  
+  boxes <- osem_boxes(grouptag = "codeformuenster")
+  expect_true(all(boxes$grouptag == "codeformuenster"))
+})
+
+test_that("endpoint can be (mis)configured", {
+  check_api()
+  
+  expect_error(osem_boxes(endpoint = "http://not.the.opensensemap.org"), "resolve host")
+})
+
+test_that("a response with no matches returns empty sensebox data.frame", {
+  check_api()
+  
+  boxes <- osem_boxes(grouptag = "does_not_exist")
+  expect_true(is.data.frame(boxes))
+  expect_true(any("sensebox" %in% class(boxes)))
+})
+
+test_that("a response with no matches gives a warning", {
+  check_api()
+  
+  expect_warning(osem_boxes(grouptag = "does_not_exist"), "no boxes found")
+})
+
+test_that("data.frame can be converted to sensebox data.frame", {
+  df <- osem_as_sensebox(data.frame(c(1,2), c("a", "b")))
+  expect_equal(class(df), c("sensebox", "data.frame"))
+})