Initial try on testing wait ice

Author: psprint

tests/plugins.zunit

@@ -6,6 +6,14 @@
   ZBIN=$ZPFX/bin
   export LC_CTYPE=C
   export LANG=C
+  export ZTMP=$(mktemp -qu)
+}
+
+@test 'wait-ice' {
+  run zinit wait nocd atload"qbefore: ${(kv)ZINIT_TASKS} && command touch $ZTMP" for zdharma-continuum/null && print -l tasks: ${(kv)ZINIT_TASKS}
+  sleep 1
+  assert $state equals 0
+  assert $ZTMP is_file
 }
 
 # @test 'nnn' {