haskellPackages.esqueleto: Enable tests

pkgs/development/haskell-modules/configuration-common.nix

@@ -1190,8 +1190,29 @@ self: super: {
   # Fix build with attr-2.4.48 (see #53716)
   xattr = appendPatch ./patches/xattr-fix-build.patch super.xattr;
 
-  # Some tests depend on a postgresql instance
-  esqueleto = dontCheck super.esqueleto;
+  esqueleto =
+    overrideCabal
+      (drv: {
+        postPatch = drv.postPatch or "" + ''
+          # patch out TCP usage: https://nixos.org/manual/nixpkgs/stable/#sec-postgresqlTestHook-tcp
+          sed -i test/PostgreSQL/Test.hs \
+            -e s^host=localhost^^
+        '';
+        # Match the test suite defaults (or hardcoded values?)
+        preCheck = drv.preCheck or "" + ''
+          PGUSER=esqutest
+          PGDATABASE=esqutest
+        '';
+        testFlags = drv.testFlags or [] ++ [
+          # We don't have a MySQL test hook yet
+          "--skip=/Esqueleto/MySQL"
+        ];
+        testToolDepends = drv.testToolDepends or [] ++ [
+          pkgs.postgresql
+          pkgs.postgresqlTestHook
+        ];
+      })
+      super.esqueleto;
 
   # Requires API keys to run tests
   algolia = dontCheck super.algolia;