diff --git a/.Rbuildignore b/.Rbuildignore
index d1a82a8..e42aee3 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -2,3 +2,7 @@
 ^\.Rproj\.user$
 ^CHANGES\.md$
 ^tools*$
+^\.travis\.yml$
+^appveyor\.yml$
+^CONDUCT\.md$
+^codecov\.yml$
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..a9e1036
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,24 @@
+# R for travis: see documentation at https://docs.travis-ci.com/user/languages/r
+
+language: R
+sudo: false
+cache: packages
+
+r:
+  - release
+  - devel
+
+r_github_packages:
+  - r-lib/covr
+  
+before_install:
+  - sudo add-apt-repository ppa:ubuntugis/ubuntugis-unstable --yes
+  - sudo apt-get --yes --force-yes update -qq
+  # units/udunits2 dependency:
+  - sudo apt-get install --yes libudunits2-dev
+  # sf dependencies:
+  - sudo apt-get install --yes libproj-dev libgeos-dev libgdal-dev
+ 
+after_success:
+  - Rscript -e 'covr::codecov()'
+  #- Rscript -e 'lintr::lint_package()'
diff --git a/CONDUCT.md b/CONDUCT.md
new file mode 100644
index 0000000..52a673e
--- /dev/null
+++ b/CONDUCT.md
@@ -0,0 +1,25 @@
+# Contributor Code of Conduct
+
+As contributors and maintainers of this project, we pledge to respect all people who 
+contribute through reporting issues, posting feature requests, updating documentation,
+submitting pull requests or patches, and other activities.
+
+We are committed to making participation in this project a harassment-free experience for
+everyone, regardless of level of experience, gender, gender identity and expression,
+sexual orientation, disability, personal appearance, body size, race, ethnicity, age, or religion.
+
+Examples of unacceptable behavior by participants include the use of sexual language or
+imagery, derogatory comments or personal attacks, trolling, public or private harassment,
+insults, or other unprofessional conduct.
+
+Project maintainers have the right and responsibility to remove, edit, or reject comments,
+commits, code, wiki edits, issues, and other contributions that are not aligned to this 
+Code of Conduct. Project maintainers who do not follow the Code of Conduct may be removed 
+from the project team.
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by 
+opening an issue or contacting one or more of the project maintainers.
+
+This Code of Conduct is adapted from the Contributor Covenant 
+(http:contributor-covenant.org), version 1.0.0, available at 
+http://contributor-covenant.org/version/1/0/0/
diff --git a/DESCRIPTION b/DESCRIPTION
index 7142aae..c169762 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: opensensmapr
 Type: Package
 Title: Work with Sensor Data from opensensemap.org in R
-Version: 0.3.2
+Version: 0.3.3
 URL: http://github.com/noerw/opensensmapR
 BugReports: http://github.com/noerw/opensensmapR/issues
 Imports:
@@ -17,9 +17,11 @@ Suggests:
     knitr,
     rmarkdown,
     lubridate,
-    units
-Author: Norwin Roosen
-Maintainer: Norwin Roosen <bugs@nroo.de>
+    units,
+    testthat,
+    covr
+Authors@R: c(person("Norwin", "Roosen", role = c("aut", "cre"), email = "bugs@nroo.de"),
+    person("Daniel", "Nuest", role = c("ctb"), email = "daniel.nuest@uni-muenster.de", comment = c(ORCID = "0000-0003-2392-6140")))
 Description: Download data (environmental measurements, sensorstations) from the
     API of open data sensor web platform 'opensensemap.org' for analysis in R.
     This platform provides realtime data of more than 1000 low-cost sensor
diff --git a/NAMESPACE b/NAMESPACE
index 89b3a1a..cfff8db 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -20,6 +20,7 @@ export(osem_as_sensebox)
 export(osem_box)
 export(osem_boxes)
 export(osem_counts)
+export(osem_endpoint)
 export(osem_measurements)
 export(osem_phenomena)
 export(st_as_sf.osem_measurements)
diff --git a/R/00utils.R b/R/00utils.R
index 9c60f28..fb042fb 100644
--- a/R/00utils.R
+++ b/R/00utils.R
@@ -29,7 +29,7 @@ dplyr_class_wrapper = function(callback) {
 #' the callstack. See https://stackoverflow.com/a/33108841
 #'
 #' @noRd
-isNonInteractive = function () {
+is_non_interactive = function () {
   ff <- sapply(sys.calls(), function(f) as.character(f[1]))
   any(ff %in% c("knit2html", "render")) || !interactive()
 }
diff --git a/R/api.R b/R/api.R
index 1726aea..ff7911e 100644
--- a/R/api.R
+++ b/R/api.R
@@ -4,12 +4,19 @@
 #  for CSV responses (get_measurements) the readr package is a hidden dependency
 # ==============================================================================
 
+#' Get the default openSenseMap API endpoint
+#' @export
+#' @return A character string with the HTTP URL of the openSenseMap API
+osem_endpoint = function() {
+  'https://api.opensensemap.org'
+}
+
 get_boxes_ = function (..., endpoint) {
   response = osem_request_(endpoint, path = c('boxes'), ...)
 
   if (length(response) == 0) {
-    warning('no boxes found for this query')
-    return(response)
+    warning('no senseBoxes found for this query')
+    return(osem_as_sensebox(as.data.frame(response)))
   }
 
   # parse each list element as sensebox & combine them to a single data.frame
@@ -17,7 +24,8 @@ get_boxes_ = function (..., endpoint) {
   df = dplyr::bind_rows(boxesList)
   df$exposure = df$exposure %>% as.factor()
   df$model    = df$model %>% as.factor()
-  df$grouptag = df$grouptag %>% as.factor()
+  if(!is.null(df$grouptag))
+    df$grouptag = df$grouptag %>% as.factor()
   df
 }
 
@@ -52,7 +60,7 @@ get_stats_ = function (endpoint) {
 }
 
 osem_request_ = function (host, path, ..., type = 'parsed', progress) {
-  progress = if (progress && !isNonInteractive()) httr::progress() else NULL
+  progress = if (progress && !is_non_interactive()) httr::progress() else NULL
   res = httr::GET(host, progress, path = path, query = list(...))
 
   if (httr::http_error(res)) {
diff --git a/R/box.R b/R/box.R
index dcc2b73..49356d8 100644
--- a/R/box.R
+++ b/R/box.R
@@ -19,7 +19,7 @@
 #' @param phenomenon Only return boxes that measured the given phenomenon in the
 #'   time interval as specified through \code{date} or \code{from / to}
 #' @param endpoint The URL of the openSenseMap API instance
-#' @param progress Whether to print download progress information
+#' @param progress Whether to print download progress information defaults to \code{TRUE}
 #' @return A \code{sensebox data.frame} containing a box in each row
 #'
 #' @seealso \href{https://docs.opensensemap.org/#api-Measurements-findAllBoxes}{openSenseMap API documentation (web)}
@@ -38,8 +38,8 @@
 #'
 osem_boxes = function (exposure = NA, model = NA, grouptag = NA,
                       date = NA, from = NA, to = NA, phenomenon = NA,
-                      endpoint = 'https://api.opensensemap.org',
-                      progress = T) {
+                      endpoint = osem_endpoint(),
+                      progress = TRUE) {
 
   # error, if phenomenon, but no time given
   if (!is.na(phenomenon) && is.na(date) && is.na(to) && is.na(from))
@@ -87,7 +87,7 @@ osem_boxes = function (exposure = NA, model = NA, grouptag = NA,
 #' # get a specific box by ID
 #' b = osem_box('57000b8745fd40c8196ad04c')
 #'
-osem_box = function (boxId, endpoint = 'https://api.opensensemap.org') {
+osem_box = function (boxId, endpoint = osem_endpoint()) {
   get_box_(boxId, endpoint = endpoint)
 }
 
diff --git a/R/box_utils.R b/R/box_utils.R
index d5d964f..92460d1 100644
--- a/R/box_utils.R
+++ b/R/box_utils.R
@@ -33,7 +33,8 @@ plot.sensebox = function (x, ..., mar = c(2,2,1,1)) {
 print.sensebox = function(x, ...) {
   important_columns = c('name', 'exposure', 'lastMeasurement', 'phenomena')
   data = as.data.frame(x)
-  print(data[important_columns], ...)
+  available_columns = important_columns %in% names(data)
+  print(data[available_columns], ...)
 
   invisible(x)
 }
@@ -106,7 +107,7 @@ mutate.sensebox = dplyr_class_wrapper(osem_as_sensebox)
 #' @export
 `[.sensebox` = function(x, i, ...) {
   s = NextMethod('[')
-  mostattributes(s) = attributes(x)
+  mostattributes(s) = attributes(s)
   s
 }
 
diff --git a/R/counts.R b/R/counts.R
index 6636b1f..854b002 100644
--- a/R/counts.R
+++ b/R/counts.R
@@ -11,6 +11,6 @@
 #'
 #' @export
 #' @seealso \href{https://docs.opensensemap.org/#api-Misc-getStatistics}{openSenseMap API documentation (web)}
-osem_counts = function (endpoint = 'https://api.opensensemap.org') {
+osem_counts = function(endpoint = osem_endpoint()) {
   get_stats_(endpoint)
 }
diff --git a/R/measurement.R b/R/measurement.R
index 48b69e9..53937c9 100644
--- a/R/measurement.R
+++ b/R/measurement.R
@@ -18,7 +18,7 @@
 #' @param exposure Filter sensors by their exposure ('indoor', 'outdoor', 'mobile')
 #' @param from A \code{POSIXt} like object to select a time interval
 #' @param to A \code{POSIXt} like object to select a time interval
-#' @param columns Select specific column in the output (see oSeM documentation)
+#' @param columns Select specific column in the output (see openSenseMap API documentation)
 #' @param endpoint The URL of the openSenseMap API
 #' @param progress Whether to print download progress information
 #'
@@ -36,7 +36,7 @@ osem_measurements = function (x, ...) UseMethod('osem_measurements')
 #' @export
 #' @examples
 #' # get measurements from all boxes
-#' osem_measurements('Windrichtung')
+#' m1 = osem_measurements('Windrichtung')
 #'
 osem_measurements.default = function (x, ...) {
   bbox = structure(c(-180, -90, 180, 90), class = 'bbox')
@@ -50,16 +50,16 @@ osem_measurements.default = function (x, ...) {
 #' @examples
 #' # get measurements from sensors within a bounding box
 #' bbox = structure(c(7, 51, 8, 52), class = 'bbox')
-#' osem_measurements(bbox, 'Temperatur')
+#' m2 = osem_measurements(bbox, 'Temperatur')
 #'
 #' points = sf::st_multipoint(matrix(c(7.5, 7.8, 51.7, 52), 2, 2))
 #' bbox2 = sf::st_bbox(points)
-#' osem_measurements(bbox2, 'Temperatur', exposure = 'outdoor')
+#' m3 = osem_measurements(bbox2, 'Temperatur', exposure = 'outdoor')
 #'
 osem_measurements.bbox = function (x, phenomenon, exposure = NA,
                                    from = NA, to = NA, columns = NA,
                                    ...,
-                                   endpoint = 'https://api.opensensemap.org',
+                                   endpoint = osem_endpoint(),
                                    progress = T) {
   bbox = x
   environment() %>%
@@ -79,12 +79,12 @@ osem_measurements.bbox = function (x, phenomenon, exposure = NA,
 #'
 #' # ...or a single box
 #' b = osem_box('57000b8745fd40c8196ad04c')
-#' osem_measurements(b, phenomenon = 'Temperatur')
+#' m4 = osem_measurements(b, phenomenon = 'Temperatur')
 #'
 osem_measurements.sensebox = function (x, phenomenon, exposure = NA,
                                        from = NA, to = NA, columns = NA,
                                        ...,
-                                       endpoint = 'https://api.opensensemap.org',
+                                       endpoint = osem_endpoint(),
                                        progress = T) {
   boxes = x
   environment() %>%
@@ -106,8 +106,10 @@ parse_get_measurements_params = function (params) {
   if (is.null(params$phenomenon) | is.na(params$phenomenon))
     stop('Parameter "phenomenon" is required')
 
-  if (!is.na(params$from) && is.na(params$to))
-    stop('specify "from" only together with "to"')
+  if (
+    (!is.na(params$from) && is.na(params$to)) ||
+    (!is.na(params$to) && is.na(params$from))
+  ) stop('specify "from" only together with "to"')
 
   if (
     (!is.null(params$bbox) && !is.null(params$boxes)) ||
@@ -130,7 +132,7 @@ parse_get_measurements_params = function (params) {
   }
 
   if (!is.na(params$exposure)) query$exposure = params$exposure
-  if (!is.na(params$columns))
+  if (!any(is.na(params$columns)))
     query$columns = paste(params$columns, collapse = ',')
   else
     query$columns = 'value,createdAt,lon,lat,sensorId,unit'
@@ -160,7 +162,7 @@ paged_measurements_req = function (query) {
     query$`to-date` = date_as_isostring(page$to)
     res = do.call(get_measurements_, query)
 
-    if (query$progress && !isNonInteractive())
+    if (query$progress && !is_non_interactive())
       cat(paste(query$`from-date`, query$`to-date`, sep = ' - '), '\n')
 
     res
diff --git a/R/measurement_utils.R b/R/measurement_utils.R
index 75d83d1..3291be9 100644
--- a/R/measurement_utils.R
+++ b/R/measurement_utils.R
@@ -43,7 +43,7 @@ mutate.osem_measurements = dplyr_class_wrapper(osem_as_measurements)
 #' @export
 `[.osem_measurements` = function(x, i, ...) {
   s = NextMethod('[')
-  mostattributes(s) = attributes(x)
+  mostattributes(s) = attributes(s)
   s
 }
 
diff --git a/README.md b/README.md
index 0cdd517..4b76fca 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,12 @@
 # opensensmapr
-This R package ingests data (environmental measurements, sensor stations) from
-the API of opensensemap.org for analysis in R.
+
+[![CRAN status](http://www.r-pkg.org/badges/version/opensensmapr)](https://cran.r-project.org/package=opensensmapr) [![Travis build status](https://travis-ci.org/noerw/opensensmapR.svg?branch=master)](https://travis-ci.org/noerw/opensensmapR) [![AppVeyor Build Status](https://ci.appveyor.com/api/projects/status/github/noerw/opensensmapR?branch=master&svg=true)](https://ci.appveyor.com/project/noerw/opensensmapR) [![Coverage status](https://codecov.io/gh/noerw/opensensmapR/branch/master/graph/badge.svg)](https://codecov.io/github/noerw/opensensmapR?branch=master)
+
+This R package ingests data (environmental measurements, sensor stations) from the API of opensensemap.org for analysis in R.
 The package aims to be compatible with sf and the tidyverse.
 
 ## Installation
+
 Right now, the package is not on CRAN. To install it from GitHub, run:
 
 ```r
@@ -12,9 +15,10 @@ devtools::install_github('noerw/opensensmapr')
 ```
 
 ## Usage
+
 A verbose usage example is shown in the vignette [`osem-intro`](https://noerw.github.com/opensensmapR/inst/doc/osem-intro.html).
-Each functions documentation can be viewed with `?<function-name>`. An overview
-is given in `?opensensmapr`.
+Each functions documentation can be viewed with `?<function-name>`.
+An overview is given in `?opensensmapr`.
 In short, the following pseudocode shows the main functions for data retrieval:
 
 ```r
@@ -39,17 +43,23 @@ osem_counts()
 Additionally there are some helpers: `summary.sensebox(), plot.sensebox(), st_as_sf.sensebox(), osem_as_sensebox(), [.sensebox(), filter.sensebox(), mutate.sensebox(), ...`.
 
 ## Changelog
-This project adheres to semantic versioning, for changes in recent versions
-please consult [CHANGES.md](CHANGES.md).
+
+This project adheres to semantic versioning, for changes in recent versions please consult [CHANGES.md](CHANGES.md).
 
 ## FAQ
-- *Whats up with that package name?* idk, the R people seem to [enjoy][1]
-[dropping][2] [vovels][3] so.. Unfortunately I couldn't fit the naming
-convention to drop an `y` in there.
+
+- *Whats up with that package name?* idk, the R people seem to [enjoy][1] [dropping][2] [vovels][3] so..
+Unfortunately I couldn't fit the naming convention to drop an `y` in there.
 
 [1]: https://github.com/tidyverse/readr
 [2]: https://github.com/tidyverse/dplyr
 [3]: https://github.com/tidyverse/tidyr
 
+## Development
+
+Please note that this project is released with a [Contributor Code of Conduct](CONDUCT.md).
+By participating in this project you agree to abide by its terms.
+
 ## License
+
 GPL-2.0 - Norwin Roosen
diff --git a/appveyor.yml b/appveyor.yml
new file mode 100644
index 0000000..c6c1438
--- /dev/null
+++ b/appveyor.yml
@@ -0,0 +1,45 @@
+# DO NOT CHANGE the "init" and "install" sections below
+
+# Download script file from GitHub
+init:
+  ps: |
+        $ErrorActionPreference = "Stop"
+        Invoke-WebRequest http://raw.github.com/krlmlr/r-appveyor/master/scripts/appveyor-tool.ps1 -OutFile "..\appveyor-tool.ps1"
+        Import-Module '..\appveyor-tool.ps1'
+
+install:
+  ps: Bootstrap
+
+cache:
+  - C:\RLibrary
+
+# Adapt as necessary starting from here
+
+build_script:
+  - travis-tool.sh install_deps
+
+test_script:
+  - travis-tool.sh run_tests
+
+on_failure:
+  - 7z a failure.zip *.Rcheck\*
+  - appveyor PushArtifact failure.zip
+
+artifacts:
+  - path: '*.Rcheck\**\*.log'
+    name: Logs
+
+  - path: '*.Rcheck\**\*.out'
+    name: Logs
+
+  - path: '*.Rcheck\**\*.fail'
+    name: Logs
+
+  - path: '*.Rcheck\**\*.Rout'
+    name: Logs
+
+  - path: '\*_*.tar.gz'
+    name: Bits
+
+  - path: '\*_*.zip'
+    name: Bits
diff --git a/codecov.yml b/codecov.yml
new file mode 100644
index 0000000..8f36b6c
--- /dev/null
+++ b/codecov.yml
@@ -0,0 +1,12 @@
+comment: false
+
+coverage:
+  status:
+    project:
+      default:
+        target: auto
+        threshold: 1%
+    patch:
+      default:
+        target: auto
+        threshold: 1%
diff --git a/man/opensensmapr.Rd b/man/opensensmapr.Rd
index 72ddee2..1cd5da0 100644
--- a/man/opensensmapr.Rd
+++ b/man/opensensmapr.Rd
@@ -91,3 +91,12 @@ openSenseMap API: \url{https://api.opensensemap.org/}
 
 official openSenseMap API documentation: \url{https://docs.opensensemap.org/}
 }
+\author{
+\strong{Maintainer}: Norwin Roosen \email{bugs@nroo.de}
+
+Other contributors:
+\itemize{
+  \item Daniel Nuest \email{daniel.nuest@uni-muenster.de} (0000-0003-2392-6140) [contributor]
+}
+
+}
diff --git a/man/osem_box.Rd b/man/osem_box.Rd
index 656d5a9..f891654 100644
--- a/man/osem_box.Rd
+++ b/man/osem_box.Rd
@@ -4,7 +4,7 @@
 \alias{osem_box}
 \title{Get a single senseBox by its ID}
 \usage{
-osem_box(boxId, endpoint = "https://api.opensensemap.org")
+osem_box(boxId, endpoint = osem_endpoint())
 }
 \arguments{
 \item{boxId}{A string containing a senseBox ID}
diff --git a/man/osem_boxes.Rd b/man/osem_boxes.Rd
index 34bb92d..cb845fa 100644
--- a/man/osem_boxes.Rd
+++ b/man/osem_boxes.Rd
@@ -5,8 +5,8 @@
 \title{Get a set of senseBoxes from the openSenseMap}
 \usage{
 osem_boxes(exposure = NA, model = NA, grouptag = NA, date = NA,
-  from = NA, to = NA, phenomenon = NA,
-  endpoint = "https://api.opensensemap.org", progress = T)
+  from = NA, to = NA, phenomenon = NA, endpoint = osem_endpoint(),
+  progress = TRUE)
 }
 \arguments{
 \item{exposure}{Only return boxes with the given exposure ('indoor', 'outdoor', 'mobile')}
@@ -26,7 +26,7 @@ time interval as specified through \code{date} or \code{from / to}}
 
 \item{endpoint}{The URL of the openSenseMap API instance}
 
-\item{progress}{Whether to print download progress information}
+\item{progress}{Whether to print download progress information defaults to \code{TRUE}}
 }
 \value{
 A \code{sensebox data.frame} containing a box in each row
diff --git a/man/osem_counts.Rd b/man/osem_counts.Rd
index eff45d9..cc7c9ef 100644
--- a/man/osem_counts.Rd
+++ b/man/osem_counts.Rd
@@ -4,7 +4,7 @@
 \alias{osem_counts}
 \title{Get count statistics of the openSenseMap Instance}
 \usage{
-osem_counts(endpoint = "https://api.opensensemap.org")
+osem_counts(endpoint = osem_endpoint())
 }
 \arguments{
 \item{endpoint}{The URL of the openSenseMap API}
diff --git a/man/osem_endpoint.Rd b/man/osem_endpoint.Rd
new file mode 100644
index 0000000..48ac109
--- /dev/null
+++ b/man/osem_endpoint.Rd
@@ -0,0 +1,14 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/api.R
+\name{osem_endpoint}
+\alias{osem_endpoint}
+\title{Get the default openSenseMap API endpoint}
+\usage{
+osem_endpoint()
+}
+\value{
+A character string with the HTTP URL of the openSenseMap API
+}
+\description{
+Get the default openSenseMap API endpoint
+}
diff --git a/man/osem_measurements.Rd b/man/osem_measurements.Rd
index 7ec3b90..08bc4d3 100644
--- a/man/osem_measurements.Rd
+++ b/man/osem_measurements.Rd
@@ -12,12 +12,11 @@ osem_measurements(x, ...)
 \method{osem_measurements}{default}(x, ...)
 
 \method{osem_measurements}{bbox}(x, phenomenon, exposure = NA, from = NA,
-  to = NA, columns = NA, ..., endpoint = "https://api.opensensemap.org",
-  progress = T)
+  to = NA, columns = NA, ..., endpoint = osem_endpoint(), progress = T)
 
 \method{osem_measurements}{sensebox}(x, phenomenon, exposure = NA,
-  from = NA, to = NA, columns = NA, ...,
-  endpoint = "https://api.opensensemap.org", progress = T)
+  from = NA, to = NA, columns = NA, ..., endpoint = osem_endpoint(),
+  progress = T)
 }
 \arguments{
 \item{x}{Depending on the method, either
@@ -38,7 +37,7 @@ osem_measurements(x, ...)
 
 \item{to}{A \code{POSIXt} like object to select a time interval}
 
-\item{columns}{Select specific column in the output (see oSeM documentation)}
+\item{columns}{Select specific column in the output (see openSenseMap API documentation)}
 
 \item{endpoint}{The URL of the openSenseMap API}
 
@@ -64,15 +63,15 @@ a bounding box spanning the whole world.
 
 \examples{
 # get measurements from all boxes
-osem_measurements('Windrichtung')
+m1 = osem_measurements('Windrichtung')
 
 # get measurements from sensors within a bounding box
 bbox = structure(c(7, 51, 8, 52), class = 'bbox')
-osem_measurements(bbox, 'Temperatur')
+m2 = osem_measurements(bbox, 'Temperatur')
 
 points = sf::st_multipoint(matrix(c(7.5, 7.8, 51.7, 52), 2, 2))
 bbox2 = sf::st_bbox(points)
-osem_measurements(bbox2, 'Temperatur', exposure = 'outdoor')
+m3 = osem_measurements(bbox2, 'Temperatur', exposure = 'outdoor')
 
 # get measurements from a set of boxes
 b = osem_boxes(grouptag = 'ifgi')
@@ -80,7 +79,7 @@ osem_measurements(b, phenomenon = 'Temperatur')
 
 # ...or a single box
 b = osem_box('57000b8745fd40c8196ad04c')
-osem_measurements(b, phenomenon = 'Temperatur')
+m4 = osem_measurements(b, phenomenon = 'Temperatur')
 
 }
 \seealso{
diff --git a/tests/testthat.R b/tests/testthat.R
new file mode 100644
index 0000000..e0e7eed
--- /dev/null
+++ b/tests/testthat.R
@@ -0,0 +1,5 @@
+library("testthat")
+library("opensensmapr")
+library("sf")
+
+test_check("opensensmapr")
diff --git a/tests/testthat/test_box.R b/tests/testthat/test_box.R
new file mode 100644
index 0000000..4d92141
--- /dev/null
+++ b/tests/testthat/test_box.R
@@ -0,0 +1,31 @@
+context("box")
+
+check_api <- function() {
+  skip_on_cran()
+
+  code <- NA
+  try(code <- httr::status_code(httr::GET(osem_endpoint())))
+  if (is.na(code)) skip("API not available")
+}
+
+try({
+  boxes <- osem_boxes()
+})
+
+test_that("a single box can be retrieved by ID", {
+  check_api()
+
+  box <- osem_box(boxes$X_id[[1]])
+
+  expect_true("sensebox" %in% class(box))
+  expect_true("data.frame" %in% class(box))
+  expect_true(nrow(box) == 1)
+  expect_true(box$X_id == boxes$X_id[[1]])
+})
+
+
+test_that("[.sensebox maintains attributes", {
+  check_api()
+
+  expect_true(all(attributes(boxes[1:nrow(boxes), ]) %in% attributes(boxes)))
+})
diff --git a/tests/testthat/test_boxes.R b/tests/testthat/test_boxes.R
new file mode 100644
index 0000000..c0d925e
--- /dev/null
+++ b/tests/testthat/test_boxes.R
@@ -0,0 +1,112 @@
+context("boxes")
+
+check_api <- function() {
+  skip_on_cran()
+
+  code <- NA
+  try(code <- httr::status_code(httr::GET(osem_endpoint())))
+  if (is.na(code)) skip("API not available")
+}
+
+test_that("a list of all boxes can be retrieved and returns a sensebox data.frame", {
+  check_api()
+
+  boxes <- osem_boxes()
+  expect_true(is.data.frame(boxes))
+  expect_true(is.factor(boxes$model))
+  expect_true(is.character(boxes$name))
+  expect_length(names(boxes), 14)
+  expect_true(any("sensebox" %in% class(boxes)))
+})
+
+test_that("both from and to are required when requesting boxes, error otherwise", {
+  expect_error(osem_boxes(from = as.POSIXct("2017-01-01")), "must be used together")
+  expect_error(osem_boxes(to   = as.POSIXct("2017-01-01")), "must be used together")
+})
+
+test_that("a list of boxes with exposure filter returns only the requested exposure", {
+  check_api()
+
+  boxes <- osem_boxes(exposure = "mobile")
+  expect_true(all(boxes$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 and a warning", {
+  check_api()
+
+  suppressWarnings(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 senseBoxes 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"))
+})
+
+test_that("boxes can be converted to sf object", {
+  check_api()
+
+  boxes <- osem_boxes()
+  boxes_sf <- sf::st_as_sf(boxes)
+
+  expect_true(all(sf::st_is_simple(boxes_sf)))
+  expect_true("sf" %in% class(boxes_sf))
+})
+
+test_that("boxes converted to sf object keep all attributes", {
+  check_api()
+
+  boxes <- osem_boxes()
+  boxes_sf <- sf::st_as_sf(boxes)
+
+  # coord columns get removed!
+  cols <- names(boxes)[!names(boxes) %in% c('lon', 'lat')]
+  expect_true(all(cols %in% names(boxes_sf)))
+
+  expect_true("sensebox" %in% class(boxes_sf))
+})
+
+test_that("box retrieval does not give progress information in non-interactive mode", {
+  check_api()
+
+  if (!opensensmapr:::is_non_interactive()) skip("interactive session")
+
+  out <- capture.output(b <- osem_boxes())
+  expect_length(out, 0)
+})
+
diff --git a/tests/testthat/test_counts.R b/tests/testthat/test_counts.R
new file mode 100644
index 0000000..f4c7d6a
--- /dev/null
+++ b/tests/testthat/test_counts.R
@@ -0,0 +1,19 @@
+context("counts")
+
+check_api <- function() {
+  skip_on_cran()
+
+  code <- NA
+  try(code <- httr::status_code(httr::GET(osem_endpoint())))
+  if (is.na(code)) skip("API not available")
+}
+
+test_that("counts can be retrieved as a list of numbers", {
+  check_api()
+
+  counts <- osem_counts()
+
+  expect_true(is.list(counts))
+  expect_true(is.numeric(unlist(counts)))
+  expect_length(counts, 3)
+})
diff --git a/tests/testthat/test_measurements.R b/tests/testthat/test_measurements.R
new file mode 100644
index 0000000..fb85bd7
--- /dev/null
+++ b/tests/testthat/test_measurements.R
@@ -0,0 +1,121 @@
+context("measurements")
+
+check_api <- function() {
+  skip_on_cran()
+
+  code <- NA
+  try(code <- httr::status_code(httr::GET(osem_endpoint())))
+  if (is.na(code)) skip("API not available")
+}
+
+try({
+  boxes <- osem_boxes()
+ })
+
+test_that("measurements can be retrieved for a phenomenon", {
+  check_api()
+
+  measurements <- osem_measurements(x = "Windgeschwindigkeit")
+  expect_true(is.data.frame(measurements))
+  expect_true("osem_measurements" %in% class(measurements))
+})
+
+test_that("measurement retrieval does not give progress information in non-interactive mode", {
+  check_api()
+
+  if (!opensensmapr:::is_non_interactive()) skip("interactive session")
+
+  out <- capture.output(measurements <- osem_measurements(x = "Licht"))
+  expect_length(out, 0)
+})
+
+test_that("a response with no matching senseBoxes gives an error", {
+  check_api()
+
+  expect_error(osem_measurements(x = "Windgeschwindigkeit", exposure = "indoor"), "No senseBoxes found")
+})
+
+test_that("data.frame can be converted to measurements data.frame", {
+  df <- osem_as_measurements(data.frame(c(1,2), c("a", "b")))
+  expect_equal(class(df), c("osem_measurements", "data.frame"))
+})
+
+test_that("columns can be specified for phenomena", {
+  check_api()
+
+  cols <- c("value", "boxId", "boxName")
+  measurements <- osem_measurements(x = "Windgeschwindigkeit", columns = cols)
+  expect_equal(names(measurements), cols)
+})
+
+test_that("measurements can be retrieved for a phenomenon and exposure", {
+  check_api()
+
+  measurements <- osem_measurements(x = "Temperatur", exposure = "unknown",
+                                    columns = c("value", "boxId", "boxName"))
+  expect_equal(nrow(measurements), 0)
+})
+
+test_that("measurements of specific boxes can be retrieved for one phenomenon and returns a measurements data.frame", {
+  check_api()
+
+  # fix for subsetting
+  class(boxes) <- c("data.frame")
+  three_boxes <- boxes[1:3,]
+  class(boxes) <- c("sensebox", "data.frame")
+  three_boxes <- osem_as_sensebox(three_boxes)
+  phens <- names(osem_phenomena(three_boxes))
+
+  measurements <- osem_measurements(x = three_boxes, phenomenon = phens[[1]])
+  expect_true(is.data.frame(measurements))
+  expect_true("osem_measurements" %in% class(measurements))
+})
+
+test_that("measurements can be retrieved for a bounding box", {
+  check_api()
+
+  sfc <- sf::st_sfc(sf::st_linestring(x = matrix(data = c(7, 8, 50, 51), ncol = 2)), crs = 4326)
+  bbox <- sf::st_bbox(sfc)
+  measurements <- osem_measurements(x = bbox, phenomenon = "Windrichtung")
+  expect_true(all(unique(measurements$lat) > 50))
+  expect_true(all(unique(measurements$lat) < 51))
+  expect_true(all(unique(measurements$lon) < 8))
+  expect_true(all(unique(measurements$lon) > 7))
+})
+
+test_that("measurements can be retrieved for a time period", {
+  check_api()
+
+  from_date <- as.POSIXct("2018-01-01 12:00:00")
+  to_date <- as.POSIXct("2018-01-01 13:00:00")
+  measurements <- osem_measurements(x = "Temperature", from = from_date, to = to_date)
+
+  expect_true(all(measurements$createdAt < to_date))
+  expect_true(all(measurements$createdAt > from_date))
+})
+
+test_that("measurements can be retrieved for a time period > 31 days", {
+  check_api()
+
+  from_date <- as.POSIXct("2017-11-01 12:00:00")
+  to_date <- as.POSIXct("2018-01-01 13:00:00")
+  measurements <- osem_measurements(x = "Windrichtung", from = from_date, to = to_date)
+
+  expect_true(all(measurements$createdAt < to_date))
+  expect_true(all(measurements$createdAt > from_date))
+})
+
+test_that("both from and to are required when requesting measurements, error otherwise", {
+  expect_error(osem_measurements(x = "Temperature", from = as.POSIXct("2017-01-01")), "only together with")
+  expect_error(osem_measurements(x = "Temperature", to   = as.POSIXct("2017-01-01")), "only together with")
+})
+
+test_that("[.osem_measurements maintains attributes", {
+  check_api()
+
+  sfc <- sf::st_sfc(sf::st_linestring(x = matrix(data = c(7, 8, 50, 51), ncol = 2)), crs = 4326)
+  bbox <- sf::st_bbox(sfc)
+  m <- osem_measurements(x = bbox, phenomenon = "Windrichtung")
+
+  expect_true(all(attributes(m[1:nrow(m), ]) %in% attributes(m)))
+})
diff --git a/tests/testthat/test_phenomena.R b/tests/testthat/test_phenomena.R
new file mode 100644
index 0000000..5cf7682
--- /dev/null
+++ b/tests/testthat/test_phenomena.R
@@ -0,0 +1,40 @@
+context("phenomena")
+
+check_api <- function() {
+  skip_on_cran()
+
+  code <- NA
+  try(code <- httr::status_code(httr::GET(osem_endpoint())))
+  if (is.na(code)) skip("API not available")
+}
+
+try({
+  boxes <- osem_boxes()
+  all_phen <- unique(unlist(boxes$phenomena))
+})
+
+test_that("phenomena from boxes is a list of counts", {
+  check_api()
+
+  phenomena <- osem_phenomena(boxes)
+
+  expect_true(is.numeric(unlist(phenomena)))
+  expect_true(is.list(phenomena))
+})
+
+test_that("phenomena from boxes has all phenomena", {
+  check_api()
+
+  phenomena <- osem_phenomena(boxes)
+
+  expect_true(all(all_phen %in% names(phenomena)))
+  expect_true(all(names(phenomena) %in% all_phen))
+})
+
+test_that("phenomena from a not sensebox data.frame returns error", {
+  expect_error(osem_phenomena(list()), "no applicable method")
+  expect_error(osem_phenomena(data.frame()), "no applicable method")
+  boxes_df <- boxes
+  class(boxes_df) <- c("data.frame")
+  expect_error(osem_phenomena(boxes_df), "no applicable method")
+})