Deduplicate declared tags (zircote#1634)

src/Processors/AugmentTags.php

@@ -34,6 +34,10 @@ public function __invoke(Analysis $analysis)
                 $declaredTags[$tag->name] = $tag;
             }
         }
+        if ($declaredTags) {
+            // last one wins
+            $analysis->openapi->tags = array_values($declaredTags);
+        }
 
         if ($usedTagNames) {
             $declatedTagNames = array_keys($declaredTags);

tests/Fixtures/SurplusTag.php

@@ -14,11 +14,18 @@
         description: 'test',
         version: '2.0.0'
     ),
+    tags: [
+        // definding tag 'other' globally with nice description
+        new OAT\Tag('other', 'Other description'),
+    ]
 )]
 class SurplusTag
 {
     #[OAT\Get(path: '/world/', tags: ['tag world'], responses: [new OAT\Response(response: '200', description: 'success')])]
     #[OAT\Get(path: '/hello/', tags: ['tag hello'], responses: [new OAT\Response(response: '200', description: 'success')])]
+    #[OAT\Get(path: '/other/', tags: ['other'], responses: [new OAT\Response(response: '200', description: 'success')])]
+    // also definding tag 'other' with another description
+    #[OAT\Tag('other', 'Another description')]
     public function hello(): void
     {
     }

tests/Processors/AugmentTagsTest.php

@@ -13,7 +13,7 @@ class AugmentTagsTest extends OpenApiTestCase
     /**
      * @requires PHP 8.1
      */
-    public function testAugmentTags(): void
+    public function testFilteredAugmentTags(): void
     {
         $this->skipLegacy();
 
@@ -25,4 +25,17 @@ public function testAugmentTags(): void
 
         $this->assertCount(1, $analysis->openapi->tags);
     }
+
+    /**
+     * @requires PHP 8.1
+     */
+    public function testDedupedAugmentTags(): void
+    {
+        $this->skipLegacy();
+
+        $analysis = $this->analysisFromFixtures(['SurplusTag.php'], static::processors());
+
+        echo $analysis->openapi->toYaml();
+        $this->assertCount(3, $analysis->openapi->tags, 'Expecting 3 unique tags');
+    }
 }