Add test for prompt copy

Author: ilayaperumalg

spring-ai-core/src/test/java/org/springframework/ai/prompt/PromptTests.java

@@ -23,11 +23,14 @@
 import org.assertj.core.api.Assertions;
 import org.junit.jupiter.api.Test;
 
+import org.springframework.ai.chat.prompt.ChatOptions;
+import org.springframework.ai.chat.prompt.ChatOptionsBuilder;
 import org.springframework.ai.chat.prompt.Prompt;
 import org.springframework.ai.chat.prompt.PromptTemplate;
 import org.springframework.ai.chat.prompt.SystemPromptTemplate;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.assertNotSame;
 
 @SuppressWarnings("unchecked")
 class PromptTests {
@@ -130,4 +133,21 @@ void testBadFormatOfTemplateString() {
 			.hasMessage("The template string is not valid.");
 	}
 
+	@Test
+	public void testPromptCopy() {
+		String template = "Hello, {name}! Your age is {age}.";
+		Map<String, Object> model = new HashMap<>();
+		model.put("name", "Alice");
+		model.put("age", 30);
+		PromptTemplate promptTemplate = new PromptTemplate(template, model);
+		ChatOptions chatOptions = ChatOptionsBuilder.builder().withTemperature(0.5).withMaxTokens(100).build();
+
+		Prompt prompt = promptTemplate.create(model, chatOptions);
+
+		Prompt copiedPrompt = prompt.copy();
+		assertNotSame(prompt, copiedPrompt);
+		assertNotSame(prompt.getOptions(), copiedPrompt.getOptions());
+		assertNotSame(prompt.getInstructions(), copiedPrompt.getInstructions());
+	}
+
 }