Fix #528 remove and restore highlights when buffers are hidden and shown

1 files changed, 16 insertions, 0 deletions

diff --git a/test/test_highlight_placement.vader b/test/test_highlight_placement.vader
index bca7bfda..14c16328 100644
--- a/test/test_highlight_placement.vader
+++ b/test/test_highlight_placement.vader
@@ -91,3 +91,19 @@ Execute(Highlights set by ALE should be removed when buffer cleanup is done):
   call ale#cleanup#Buffer(bufnr('%'))
 
   AssertEqual [], getmatches()
+
+Execute(Highlights should be cleared when buffers are hidden):
+  call ale#engine#InitBufferInfo(bufnr('%'))
+  call ale#highlight#SetHighlights(bufnr('%'), [
+  \ {'bufnr': bufnr('%'), 'type': 'E', 'lnum': 3, 'col': 2},
+  \])
+
+  AssertEqual 1, len(getmatches()), 'The highlights weren''t initially set!'
+
+  call ale#highlight#BufferHidden(bufnr('%'))
+
+  AssertEqual 0, len(getmatches()), 'The highlights weren''t cleared!'
+
+  call ale#highlight#UpdateHighlights()
+
+  AssertEqual 1, len(getmatches()), 'The highlights weren''t set again!'