Improve ts syn test

Fix

test/new/Makefile

@@ -1,5 +1,5 @@
 RANDOM := $(shell bash -c 'echo $$RANDOM')
-COVER = covimerage run --append --no-report \
+COVER = covimerage -q run --append --no-report \
        --data-file $(CURDIR)/cov.tmp/_$(RANDOM)_coverage_covimerage_$@ \
        --source $(CURDIR)/../../autoload \
        --source $(CURDIR)/../../plugin

test/new/test-syn/Makefile

@@ -9,3 +9,4 @@ test:
 	@MODE=0 $(MYVIM) -u test.vim
 	@MODE=1 $(MYVIM) -u test.vim
 	@MODE=2 $(MYVIM) -u test.vim
+	@MODE=3 $(MYVIM) -u test.vim

test/new/test-syn/test.vim

@@ -2,9 +2,12 @@ set nocompatible
 source ../common/bootstrap.vim
 
 if !$TESTS_ENABLE_TREESITTER && $MODE > 0
+  echo 'Exiting'
   call matchup#test#finished()
 endif
 
+let s:expect_ts_engine = +$TESTS_ENABLE_TREESITTER
+
 if $MODE == 1
   lua <<EOF
   require'nvim-treesitter.configs'.setup {
@@ -22,10 +25,36 @@ elseif $MODE == 2
     }
   }
 EOF
+elseif $MODE == 3
+  lua <<EOF
+  require'nvim-treesitter.configs'.setup {
+    highlight = { enable = true },
+    matchup   = { enable = false }
+  }
+EOF
+
+  let s:expect_ts_engine = 0
 endif
 
 silent edit example.rb
 
+" manually reload match-up for the buffer since the tree-sitter
+" configuration may not have been initialized properly before
+call matchup#loader#init_buffer()
+
+if s:expect_ts_engine
+  call assert_equal(2, len(b:matchup_active_engines.delim_all))
+endif
+
+if $MODE == 2
+  call assert_false(empty(&syntax))
+endif
+
+" if syntax is not available, we should use ts-based skip
+if empty(&syntax)
+  call assert_true(b:matchup_delim_skip =~# 'ts_syntax')
+endif
+
 function! s:match_test(pos, check) abort
   call matchup#pos#set_cursor(a:pos)
   normal %