Unit tests for Generation class

spring-ai-core/src/test/java/org/springframework/ai/chat/model/GenerationTests.java

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+package org.springframework.ai.chat.model;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.springframework.ai.chat.messages.AssistantMessage;
+import org.springframework.ai.chat.metadata.ChatGenerationMetadata;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * This class defines and contains unit tests for the Generation class.
+ *
+ * @author Vivek504
+ */
+public class GenerationTests {
+
+	@Mock
+	private ChatGenerationMetadata mockChatGenerationMetadata1;
+
+	@Mock
+	private ChatGenerationMetadata mockChatGenerationMetadata2;
+
+	@BeforeEach
+	void setUp() {
+		MockitoAnnotations.openMocks(this);
+	}
+
+	@Test
+	void testGetOutput() {
+		String expectedText = "Test Assistant Message";
+		AssistantMessage assistantMessage = new AssistantMessage(expectedText);
+		Generation generation = new Generation(assistantMessage);
+
+		assertEquals(expectedText, generation.getOutput().getContent());
+	}
+
+	@Test
+	void testConstructorWithMetadata() {
+		AssistantMessage assistantMessage = new AssistantMessage("Test Assistant Message");
+		Generation generation = new Generation(assistantMessage, mockChatGenerationMetadata1);
+
+		assertEquals(mockChatGenerationMetadata1, generation.getMetadata());
+	}
+
+	@Test
+	void testGetMetadata_Null() {
+		AssistantMessage assistantMessage = new AssistantMessage("Test Assistant Message");
+		Generation generation = new Generation(assistantMessage);
+		ChatGenerationMetadata metadata = generation.getMetadata();
+
+		assertEquals(ChatGenerationMetadata.NULL, metadata);
+	}
+
+	@Test
+	void testGetMetadata_NotNull() {
+		AssistantMessage assistantMessage = new AssistantMessage("Test Assistant Message");
+		Generation generation = new Generation(assistantMessage, mockChatGenerationMetadata1);
+		ChatGenerationMetadata metadata = generation.getMetadata();
+
+		assertEquals(mockChatGenerationMetadata1, metadata);
+	}
+
+	@Test
+	void testEquals_SameObjects() {
+		AssistantMessage assistantMessage = new AssistantMessage("Test Assistant Message");
+		Generation generation1 = new Generation(assistantMessage);
+		Generation generation2 = generation1;
+
+		assertTrue(generation1.equals(generation2));
+	}
+
+	@Test
+	void testEquals_NotInstanceOfGeneration() {
+		AssistantMessage assistantMessage = new AssistantMessage("Test Assistant Message");
+		Generation generation = new Generation(assistantMessage);
+		Object notGenerationObject = new Object();
+
+		assertFalse(generation.equals(notGenerationObject));
+	}
+
+	@Test
+	void testEquals_SameMetadata() {
+		AssistantMessage assistantMessage1 = new AssistantMessage("Test Assistant Message");
+		AssistantMessage assistantMessage2 = new AssistantMessage("Test Assistant Message");
+		Generation generation1 = new Generation(assistantMessage1, mockChatGenerationMetadata1);
+		Generation generation2 = new Generation(assistantMessage2, mockChatGenerationMetadata1);
+
+		assertTrue(generation1.equals(generation2));
+	}
+
+	@Test
+	void testEquals_DifferentMetadata() {
+		AssistantMessage assistantMessage1 = new AssistantMessage("Test Assistant Message");
+		AssistantMessage assistantMessage2 = new AssistantMessage("Test Assistant Message");
+		Generation generation1 = new Generation(assistantMessage1, mockChatGenerationMetadata1);
+		Generation generation2 = new Generation(assistantMessage2, mockChatGenerationMetadata2);
+
+		assertFalse(generation1.equals(generation2));
+	}
+
+}