refs #23448 [finc] fix SearchSpecsReaderTest setUpBeforeClass - keep parent signature return type

* fix test for local searchspecs match - add WorkKeys

module/finc/tests/fixtures/configs/yaml/searchspecs/result/local/alpha/searchspecs.yaml

@@ -513,3 +513,9 @@ CallNumber:
     dewey-search:
       - [callnumber_exact, 1000]
       - [callnumber_fuzzy, null]
+
+WorkKeys:
+  QueryFields:
+    work_keys_str_mv:
+      - [and, 100]
+      - [or, ~]
\ No newline at end of file

module/finc/tests/fixtures/configs/yaml/searchspecs/result/local/searchspecs.yaml

@@ -513,3 +513,9 @@ CallNumber:
     dewey-search:
       - [callnumber_exact, 1000]
       - [callnumber_fuzzy, null]
+
+WorkKeys:
+  QueryFields:
+    work_keys_str_mv:
+      - [and, 100]
+      - [or, ~]
\ No newline at end of file

module/finc/tests/unit-tests/src/fincTest/Config/SearchSpecsReaderTest.php

@@ -76,7 +76,7 @@ class SearchSpecsReaderTest extends \VuFindTest\Config\SearchSpecsReaderTest
      *
      * @return void
      */
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         // Don't create test files, use existing.