Disallow fetching from Wikidata disambiguation pages

Close #23

tests/NodaWikidataFetcherTest.php

@@ -11,6 +11,7 @@ use PHPUnit\Framework\Attributes\Medium;
 use PHPUnit\Framework\Attributes\DataProvider;
 
 require_once __DIR__ . '/../../MDMysqli/test_connections.conf.php';
+require_once __DIR__ . '/../src/NodaWikidataFetcherDisambiguationIsDisallowedException.php';
 
 /**
  * This script contains tests for the Wikidata fetcher.
@@ -37,6 +38,34 @@ final class NodaWikidataFetcherTest extends TestCase {
 
     }
 
+    /**
+     * Data provider providing a Wikidata ID for a dedicated wikidata item for disambiguation pages.
+     *
+     * @return array<string: array{0: string}>
+     */
+    public static function disambiguationPageProvider():array {
+
+        return [
+            'Disambiguation page for "Mochi" - Q6916210' => ['Q6916210'],
+        ];
+
+    }
+
+    /**
+     * Throw error when attempting to load a dedicated wikidata entry for a disambiguation page.
+     *
+     * @param string $wikidata_id Wikidata ID.
+     *
+     * @return void
+     */
+    #[DataProvider('disambiguationPageProvider')]
+    public function testWikidataIdFromLinkFailsForDisambiguationPages(string $wikidata_id):void {
+
+        self::expectException(NodaWikidataFetcherDisambiguationIsDisallowedException::class);
+        NodaWikidataFetcher::getWikidataEntity($wikidata_id);
+
+    }
+
     /**
      * Test to check whether the HTML page is correctly generated.
      *