patch 8.2.1432: various inconsistencies in test files

Problem:    Various inconsistencies in test files.
Solution:   Add modelines where they were missing.  Use Check commands instead
            of silently skipping over tests.  Adjust indents and comments.
            (Ken Takata, closes #6695)
diff --git a/src/testdir/test_hlsearch.vim b/src/testdir/test_hlsearch.vim
index d4db4b7..58e1d8c 100644
--- a/src/testdir/test_hlsearch.vim
+++ b/src/testdir/test_hlsearch.vim
@@ -1,5 +1,7 @@
 " Test for v:hlsearch
 
+source check.vim
+
 func Test_hlsearch()
   new
   call setline(1, repeat(['aaa'], 10))
@@ -33,9 +35,7 @@
 endfunc
 
 func Test_hlsearch_hangs()
-  if !has('reltime') || !has('float')
-    return
-  endif
+  CheckFunction reltimefloat
 
   " This pattern takes a long time to match, it should timeout.
   new
@@ -63,3 +63,5 @@
   set nohlsearch
   bwipe!
 endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab