Use Usage#getCompletionTokens instead of deprecated Usage#getGenerationTokens

Author: ilayaperumalg

models/spring-ai-openai/src/test/java/org/springframework/ai/openai/chat/proxy/DeepSeekWithOpenAiChatModelIT.java

@@ -128,11 +128,11 @@ void streamingWithTokenUsage() {
 		var referenceTokenUsage = this.chatModel.call(prompt).getMetadata().getUsage();
 
 		assertThat(streamingTokenUsage.getPromptTokens()).isGreaterThan(0);
-		assertThat(streamingTokenUsage.getGenerationTokens()).isGreaterThan(0);
+		assertThat(streamingTokenUsage.getCompletionTokens()).isGreaterThan(0);
 		assertThat(streamingTokenUsage.getTotalTokens()).isGreaterThan(0);
 
 		assertThat(streamingTokenUsage.getPromptTokens()).isEqualTo(referenceTokenUsage.getPromptTokens());
-		assertThat(streamingTokenUsage.getGenerationTokens()).isEqualTo(referenceTokenUsage.getGenerationTokens());
+		assertThat(streamingTokenUsage.getCompletionTokens()).isEqualTo(referenceTokenUsage.getCompletionTokens());
 		assertThat(streamingTokenUsage.getTotalTokens()).isEqualTo(referenceTokenUsage.getTotalTokens());
 
 	}
@@ -316,7 +316,7 @@ void validateCallResponseMetadata(String model) {
 		assertThat(response.getMetadata().getId()).isNotEmpty();
 		assertThat(response.getMetadata().getModel()).containsIgnoringCase(model);
 		assertThat(response.getMetadata().getUsage().getPromptTokens()).isPositive();
-		assertThat(response.getMetadata().getUsage().getGenerationTokens()).isPositive();
+		assertThat(response.getMetadata().getUsage().getCompletionTokens()).isPositive();
 		assertThat(response.getMetadata().getUsage().getTotalTokens()).isPositive();
 	}
 

spring-ai-core/src/test/java/org/springframework/ai/chat/metadata/DefaultUsageTests.java

@@ -184,7 +184,7 @@ void testArbitraryNativeUsageMap() throws Exception {
 		assertThat(deserialized.getPromptTokens()).isEqualTo(usage.getPromptTokens());
 		assertThat(deserialized.getCompletionTokens()).isEqualTo(usage.getCompletionTokens());
 		assertThat(deserialized.getTotalTokens()).isEqualTo(usage.getTotalTokens());
-		assertThat(deserialized.getGenerationTokens()).isEqualTo(usage.getGenerationTokens());
+		assertThat(deserialized.getCompletionTokens()).isEqualTo(usage.getCompletionTokens());
 
 		@SuppressWarnings("unchecked")
 		Map<String, Object> deserializedMap = (Map<String, Object>) deserialized.getNativeUsage();