Explicitly set accessToken to NULL in all tests

Change-Id: Id98d918b9668a8ea5720e790835a34604c52b350
diff --git a/tests/testthat/test-demos.R b/tests/testthat/test-demos.R
index b51a4cd..2e1a0a3 100644
--- a/tests/testthat/test-demos.R
+++ b/tests/testthat/test-demos.R
@@ -2,7 +2,7 @@
   skip_if_offline()
   year <- c(2013:2018)
   alternatives <- c("macht []{0,3} Sinn", "ergibt []{0,3} Sinn")
-  hc <- new("KorAPConnection", verbose = TRUE) %>%
+  hc <- new("KorAPConnection", accessToken = NULL, verbose = TRUE) %>%
     frequencyQuery(
       query = alternatives,
       vc = paste("textType = /Zeit.*/ & pubDate in", year),
@@ -17,7 +17,7 @@
   year <- c(2013:2018)
   alternatives <- c("macht []{0,3} Sinn", "ergibt []{0,3} Sinn")
 
-  hc <- new("KorAPConnection", verbose = TRUE) %>%
+  hc <- new("KorAPConnection", accessToken = NULL, verbose = TRUE) %>%
     frequencyQuery(
       query = alternatives,
       vc = paste("textType = /Zeit.*/ & pubDate in", year),
@@ -32,7 +32,7 @@
   year <- c(2013:2018)
   alternatives <- c("macht []{0,3} Sinn", "ergibt []{0,3} Sinn")
 
-  hc <- new("KorAPConnection", verbose = TRUE) %>%
+  hc <- new("KorAPConnection", accessToken = NULL, verbose = TRUE) %>%
     frequencyQuery(
       query = alternatives,
       vc = paste("textType = /Zeit.*/ & pubDate in", year),
@@ -47,7 +47,7 @@
   year <- c(2013:2018)
   q <- c("macht []{0,3} Sinn")
 
-  hc <- new("KorAPConnection", verbose = TRUE) %>%
+  hc <- new("KorAPConnection", accessToken = NULL, verbose = TRUE) %>%
     frequencyQuery(
       query = q,
       vc = paste("textType = /Zeit.*/ & pubDate in", year),
@@ -59,7 +59,7 @@
 
 test_that("Auto conditions over time highcharter example works", {
   skip_if_offline()
-  kco <- new("KorAPConnection", verbose=TRUE)
+  kco <- new("KorAPConnection", accessToken = NULL, verbose=TRUE)
   hc <- expand_grid(
     myconditions = c("textDomain = /Wirtschaft.*/",
                   "textDomain != /Wirtschaft.*/"),
@@ -76,7 +76,7 @@
 
 test_that("Single condition over time highcharter example works", {
   skip_if_offline()
-  kco <- new("KorAPConnection", verbose=TRUE)
+  kco <- new("KorAPConnection", accessToken = NULL, verbose=TRUE)
   hc <- expand_grid(
     condition = c("textDomain = /Wirtschaft.*/"),
     year = (2011:2013)
@@ -92,7 +92,7 @@
 
 test_that("Multiple conditions over time highcharter example works", {
   skip_if_offline()
-  kco <- new("KorAPConnection", verbose=TRUE)
+  kco <- new("KorAPConnection", accessToken = NULL, verbose=TRUE)
   hc <- expand_grid(
     condition = c("textDomain = /Wirtschaft.*/",
                   "textDomain != /Wirtschaft.*/"),
@@ -109,7 +109,7 @@
 
 test_that("Multiple conditions and queries over time highcharter example works", {
   skip_if_offline()
-  kco <- new("KorAPConnection", verbose=TRUE)
+  kco <- new("KorAPConnection", accessToken = NULL, verbose=TRUE)
   hc <- expand_grid(
     qx = c("[tt/l=Heuschrecke]", "Ameise"),
     condition = c("textDomain = /Wirtschaft.*/",
@@ -127,7 +127,7 @@
 
 test_that("collocationScoreQuery works with hchart and hc_add_onclick_korap_search", {
   skip_if_offline()
-  kco <- new("KorAPConnection", cache = TRUE, verbose = TRUE)
+  kco <- new("KorAPConnection", accessToken = NULL, cache = TRUE, verbose = TRUE)
   df <- collocationScoreQuery(kco,"Ameisenplage", "heimgesucht", leftContextSize=0, rightContextSize=1)
   hc <- hchart(df, type="spline", hcaes(label, logDice))
   hc <- hc_add_onclick_korap_search(hc)