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

@@ -1,81 +1,90 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
   $ cd default
   $ cat .hg/requires
   dotencode
   fncache
   generaldelta
   revlogv1
+  sparserevlog
   store
   testonly-simplestore (reposimplestore !)
 
   $ touch foo
   $ hg -q commit -A -m 'initial commit with a lot of repeated repeated repeated text to trigger compression'
   $ hg debugrevlog -c | grep 0x78
       0x78 (x)  :   1 (100.00%)
       0x78 (x)  : 110 (100.00%)
 
   $ cd ..
 
 Unknown compression engine to format.compression aborts
 
   $ hg --config experimental.format.compression=unknown init unknown
   abort: compression engine unknown defined by experimental.format.compression not available
   (run "hg debuginstall" to list available compression engines)
   [255]
 
 A requirement specifying an unknown compression engine results in bail
 
   $ hg init unknownrequirement
   $ cd unknownrequirement
   $ echo exp-compression-unknown >> .hg/requires
   $ hg log
   abort: repository requires features unknown to this Mercurial: exp-compression-unknown!
   (see https://mercurial-scm.org/wiki/MissingRequirement for more information)
   [255]
 
   $ cd ..
 
 #if zstd
 
   $ hg --config experimental.format.compression=zstd init zstd
   $ cd zstd
   $ cat .hg/requires
   dotencode
   exp-compression-zstd
   fncache
   generaldelta
   revlogv1
+  sparserevlog
   store
   testonly-simplestore (reposimplestore !)
 
   $ touch foo
   $ hg -q commit -A -m 'initial commit with a lot of repeated repeated repeated text'
 
   $ hg debugrevlog -c | grep 0x28
       0x28      :  1 (100.00%)
       0x28      : 98 (100.00%)
 
   $ cd ..
 
 Specifying a new format.compression on an existing repo won't introduce data
 with that engine or a requirement
 
   $ cd default
   $ touch bar
   $ hg --config experimental.format.compression=zstd -q commit -A -m 'add bar with a lot of repeated repeated repeated text'
 
   $ cat .hg/requires
   dotencode
   fncache
   generaldelta
   revlogv1
+  sparserevlog
   store
   testonly-simplestore (reposimplestore !)
 
   $ hg debugrevlog -c | grep 0x78
       0x78 (x)  :   2 (100.00%)
       0x78 (x)  : 199 (100.00%)
 
 #endif