patch 8.1.1544: some balloon tests don't run when they can
Problem: Some balloon tests don't run when they can.
Solution: Split GUI balloon tests off into a separate file. (Ozaki Kiichi,
closes #4538) Change the feature check into a command for
consistency.
diff --git a/src/testdir/test_prompt_buffer.vim b/src/testdir/test_prompt_buffer.vim
index 5cf65d5..58be50b 100644
--- a/src/testdir/test_prompt_buffer.vim
+++ b/src/testdir/test_prompt_buffer.vim
@@ -1,8 +1,7 @@
" Tests for setting 'buftype' to "prompt"
-if !has('channel')
- throw 'Skipped, channel feature missing'
-endif
+source check.vim
+CheckFeature channel
source shared.vim
source screendump.vim