The initdb PATH test assumes that /bin does not contain PostgreSQL
utilities. This is no longer reliable on merged-/usr systems, where /bin
may expose /usr/bin. Use an empty temporary directory as PATH instead.

PostgreSQL 12 removed recovery.conf. Configure PITR through
postgresql.conf and create recovery.signal as required by current
PostgreSQL releases.
--- ../test/Main.hs	2026-09-12 14:31:49.456907039 +0300
+++ ../test/Main.hs	2026-09-12 14:33:42.604459723 +0300
@@ -516,9 +516,10 @@
   it "throws if initdb is not on the path" $ do
     path <-  getEnv "PATH"
 
-    bracket (setEnv "PATH" "/bin") (const $ setEnv "PATH" path) $ \_ ->
-      withConfig defaultConfig (const $ pure ())
-        `shouldThrow` isDoesNotExistError
+    withTempDirectory "/tmp" "initdb-not-on-path-test" $ \dir ->
+      bracket (setEnv "PATH" dir) (const $ setEnv "PATH" path) $ \_ ->
+        withConfig defaultConfig (const $ pure ())
+          `shouldThrow` isDoesNotExistError
 
   it "throws if createdb is not on the path" $
     withTempDirectory "/tmp" "createdb-not-on-path-test" $ \dir -> do
@@ -798,8 +799,13 @@
 
       system ("chmod -R 700 " ++ dataDir) `shouldReturn` ExitSuccess
 
-      writeFile (dataDir ++ "/recovery.conf") $ "recovery_target_name='pitr'\nrecovery_target_action='promote'\nrecovery_target_inclusive=true\nrestore_command='"
-         ++ "cp " ++ walArchiveDir ++ "/%f %p'"
+      appendFile (dataDir ++ "/postgresql.conf") $
+        "recovery_target_name='pitr'\n\
+        \recovery_target_action='promote'\n\
+        \recovery_target_inclusive=true\n\
+        \restore_command='cp " ++ walArchiveDir ++ "/%f %p'\n"
+
+      writeFile (dataDir ++ "/recovery.signal") ""
 
       either throwIO pure <=< withRestart db $ \newDb -> do
         bracket (PG.connectPostgreSQL $ toConnectionString newDb) PG.close $ \conn -> do