Explicitly set accessToken to NULL in all tests

Change-Id: Id98d918b9668a8ea5720e790835a34604c52b350
diff --git a/tests/testthat/test-collocations.R b/tests/testthat/test-collocations.R
index 9734173..f847d8b 100644
--- a/tests/testthat/test-collocations.R
+++ b/tests/testthat/test-collocations.R
@@ -1,6 +1,6 @@
 test_that("collocationScoreQuery works", {
   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)
   expect_gt(df$logDice, 1)
   expect_equal(df$ll, ll(df$O1, df$O2, df$O, df$N, df$E, df$w))