update tests

test/test_latest.sh

@@ -5,5 +5,5 @@ npm -v
 node -v
 
 # test yarn
-npmci command yarn install npmts
+yarn install npmts
-npmci command npmts -v
+npmts -v

test/test_npmci.sh

@@ -1 +1,9 @@
+# check if npmci is available
 npmci -v
+
+# check if we can use lts
+npmci install lts
+
+# check if yarn picks it up
+npmci command yarn install npmts
+npmci command npmts -v