Adding new tests that will skip on CRAN, but check on CHECK.

tests/testthat.R

+library(testthat)
+library(dataRetrieval)
+test_check("dataRetrieval")
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tests/testthat/tests_userFriendly_fxns.R

+context("Unit values")
+
+test_that("Unit value data returns correct types", {
+  testthat::skip_on_cran()
+  
+  siteNumber <- '05114000'
+  parameterCd <- '00060'
+  startDate <- "2014-10-10"
+  endDate <- "2014-10-10"
+
+  rawData <- readNWISuv(siteNumber,parameterCd,startDate,endDate)
+  
+  timeZoneChange <- readNWISuv(c('04024430','04024000'),parameterCd,
+                               "2013-11-03","2013-11-03")
+
+  expect_is(rawData$dateTime, 'POSIXct')
+  
+  
+})
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