test: enable sparse-revlog for test-repo-compengines.t

We are about to enable sparse-revlog globally. To help with reviewing the
tests change, we isolate them in individual changesets.

Differential Revision: https://phab.mercurial-scm.org/D5332

tests/test-repo-compengines.t

@@ -1,3 +1,9 b''
+TRANSITIONAL CONFIG
+  $ cat << EOF >> $HGRCPATH
+  > [format]
+  > sparse-revlog = yes
+  > EOF
+
 A new repository uses zlib storage, which doesn't need a requirement
 
   $ hg init default
@@ -7,6 +13,7 b' A new repository uses zlib storage, whic'
   fncache
   generaldelta
   revlogv1
+  sparserevlog
   store
   testonly-simplestore (reposimplestore !)
 
@@ -47,6 +54,7 b' A requirement specifying an unknown comp'
   fncache
   generaldelta
   revlogv1
+  sparserevlog
   store
   testonly-simplestore (reposimplestore !)
 
@@ -71,6 +79,7 b' with that engine or a requirement'
   fncache
   generaldelta
   revlogv1
+  sparserevlog
   store
   testonly-simplestore (reposimplestore !)