fix(exts): handle pg_upgrade generated update_extensions.sql script in the extension tests

nix/ext/tests/default.nix

@@ -179,13 +179,25 @@ let
           with subtest("Check pg_regress with postgresql 15 after installing the last version"):
             test.check_pg_regress(Path("${psql_15}/lib/pgxs/src/test/regress/pg_regress"), "15", pg_regress_test_name)
 
+          has_update_script = False
           with subtest("switch to postgresql 17"):
             server.succeed(
               f"{pg17_configuration}/bin/switch-to-configuration test >&2"
             )
+            has_update_script = server.succeed(
+              "test -f /var/lib/postgresql/update_extensions.sql && echo 'yes' || echo 'no'"
+            ).strip() == "yes"
+            if has_update_script:
+              # Run the extension update script generated during the upgrade
+              test.run_sql_file("/var/lib/postgresql/update_extensions.sql")
 
           with subtest("Check last version of the extension after postgresql upgrade"):
-            test.assert_version_matches(last_version)
+            if has_update_script:
+              # If there was an update script, the last version should be installed
+              test.assert_version_matches(versions["17"][-1])
+            else:
+              # Otherwise, the version should match the last version from postgresql 15
+              test.assert_version_matches(last_version)
 
           with subtest("Check upgrade path with postgresql 17"):
             test.check_upgrade_path("17")
@@ -223,6 +235,7 @@ builtins.listToAttrs (
       "pg_net"
       "pgaudit"
       "pg_tle"
+      "postgis"
       "vector"
       "wrappers"
     ]

nix/ext/tests/http.nix

@@ -154,3 +154,6 @@ self.inputs.nixpkgs.lib.nixos.runTest {
       check_upgrade_path("17")
     '';
 }
+# We don't use the generic test for this extension because:
+# http is not using semver versioning scheme, so we need to adapt the version checks
+# otherwise the test fails with ERROR:  extension "http" has no installation script nor update path for version "1.5.0"

nix/ext/tests/pg_repack.nix

@@ -160,3 +160,6 @@ self.inputs.nixpkgs.lib.nixos.runTest {
         test.check_upgrade_path("17")
     '';
 }
+# We don't use the generic test for this extension because:
+# pg_repack does not support upgrade as the extension doesn't provide the upgrade SQL scripts
+# and fails with ERROR:  extension "pg_repack" has no update path from version "1.4.8" to version "1.5.0"

nix/ext/tests/pgrouting.nix

@@ -226,3 +226,4 @@ self.inputs.nixpkgs.lib.nixos.runTest {
       check_upgrade_path("orioledb-17")
     '';
 }
+# We don't use the generic test for this extension because: it requires postgis to be installed as well.