Fix test expectations for new exception hierarchy with indexed field names

Author: Mohamed Khaled

tests/unit/Providers/OpenAiCompatibleImplementation/AbstractOpenAiCompatibleImageGenerationModelTest.php

@@ -826,7 +826,8 @@ public function testParseResponseChoiceToCandidateMissingUrlOrB64Json(): void
 
         $this->expectException(ResponseException::class);
         $this->expectExceptionMessage(
-            'Unexpected TestProvider API response: Missing the "url or b64_json" key in choice data.'
+            'Unexpected TestProvider API response: Each choice must contain either a url or b64_json key with a ' .
+            'string value.'
         );
 
         $model->exposeParseResponseChoiceToCandidate($choiceData);

tests/unit/Providers/OpenAiCompatibleImplementation/AbstractOpenAiCompatibleTextGenerationModelTest.php

@@ -1033,7 +1033,7 @@ public function testParseResponseChoiceToCandidateMissingMessage(): void
 
         $this->expectException(ResponseException::class);
         $this->expectExceptionMessage(
-            'Unexpected TestProvider API response: Missing the "message" key in choice data.'
+            'Unexpected TestProvider API response: Missing the "choices[0].message" key.'
         );
 
         $model->exposeParseResponseChoiceToCandidate($choiceData);
@@ -1054,7 +1054,7 @@ public function testParseResponseChoiceToCandidateInvalidMessageType(): void
 
         $this->expectException(ResponseException::class);
         $this->expectExceptionMessage(
-            'Unexpected TestProvider API response: Missing the "message" key in choice data.'
+            'Unexpected TestProvider API response: Missing the "choices[0].message" key.'
         );
 
         $model->exposeParseResponseChoiceToCandidate($choiceData);
@@ -1077,7 +1077,7 @@ public function testParseResponseChoiceToCandidateMissingFinishReason(): void
 
         $this->expectException(ResponseException::class);
         $this->expectExceptionMessage(
-            'Unexpected TestProvider API response: Missing the "finish_reason" key in choice data.'
+            'Unexpected TestProvider API response: Missing the "choices[0].finish_reason" key.'
         );
 
         $model->exposeParseResponseChoiceToCandidate($choiceData);

tests/unit/Providers/OpenAiCompatibleImplementation/MockOpenAiCompatibleTextGenerationModel.php

@@ -158,9 +158,9 @@ public function exposePrepareResponseFormatParam(?array $outputSchema): array
         return $this->prepareResponseFormatParam($outputSchema);
     }
 
-    public function exposeParseResponseChoiceToCandidate(array $choiceData): Candidate
+    public function exposeParseResponseChoiceToCandidate(array $choiceData, int $index = 0): Candidate
     {
-        return $this->parseResponseChoiceToCandidate($choiceData);
+        return $this->parseResponseChoiceToCandidate($choiceData, $index);
     }
 
     public function exposeParseResponseChoiceMessage(array $messageData): Message