test: Enhance test cases for VectorStoreChatMemoryAdvisor builder

advisors/spring-ai-advisors-vector-store/src/test/java/org/springframework/ai/chat/client/advisor/vectorstore/VectorStoreChatMemoryAdvisorTests.java

@@ -19,8 +19,11 @@
 import org.junit.jupiter.api.Test;
 import org.mockito.Mockito;
 
+import org.springframework.ai.chat.prompt.PromptTemplate;
 import org.springframework.ai.vectorstore.VectorStore;
+import reactor.core.scheduler.Scheduler;
 
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
 /**
@@ -91,4 +94,116 @@ void whenDefaultTopKIsNegativeThenThrow() {
 			.hasMessageContaining("topK must be greater than 0");
 	}
 
+	@Test
+	void whenBuilderWithValidVectorStoreThenSuccess() {
+		VectorStore vectorStore = Mockito.mock(VectorStore.class);
+
+		VectorStoreChatMemoryAdvisor advisor = VectorStoreChatMemoryAdvisor.builder(vectorStore).build();
+
+		assertThat(advisor).isNotNull();
+	}
+
+	@Test
+	void whenBuilderWithAllValidParametersThenSuccess() {
+		VectorStore vectorStore = Mockito.mock(VectorStore.class);
+		Scheduler scheduler = Mockito.mock(Scheduler.class);
+		PromptTemplate systemPromptTemplate = Mockito.mock(PromptTemplate.class);
+
+		VectorStoreChatMemoryAdvisor advisor = VectorStoreChatMemoryAdvisor.builder(vectorStore)
+			.conversationId("test-conversation")
+			.scheduler(scheduler)
+			.systemPromptTemplate(systemPromptTemplate)
+			.defaultTopK(5)
+			.build();
+
+		assertThat(advisor).isNotNull();
+	}
+
+	@Test
+	void whenDefaultConversationIdIsBlankThenThrow() {
+		VectorStore vectorStore = Mockito.mock(VectorStore.class);
+
+		assertThatThrownBy(() -> VectorStoreChatMemoryAdvisor.builder(vectorStore).conversationId("   ").build())
+			.isInstanceOf(IllegalArgumentException.class)
+			.hasMessageContaining("defaultConversationId cannot be null or empty");
+	}
+
+	@Test
+	void whenBuilderWithValidConversationIdThenSuccess() {
+		VectorStore vectorStore = Mockito.mock(VectorStore.class);
+
+		VectorStoreChatMemoryAdvisor advisor = VectorStoreChatMemoryAdvisor.builder(vectorStore)
+			.conversationId("valid-id")
+			.build();
+
+		assertThat(advisor).isNotNull();
+	}
+
+	@Test
+	void whenBuilderWithValidTopKThenSuccess() {
+		VectorStore vectorStore = Mockito.mock(VectorStore.class);
+
+		VectorStoreChatMemoryAdvisor advisor = VectorStoreChatMemoryAdvisor.builder(vectorStore)
+			.defaultTopK(10)
+			.build();
+
+		assertThat(advisor).isNotNull();
+	}
+
+	@Test
+	void whenBuilderWithMinimumTopKThenSuccess() {
+		VectorStore vectorStore = Mockito.mock(VectorStore.class);
+
+		VectorStoreChatMemoryAdvisor advisor = VectorStoreChatMemoryAdvisor.builder(vectorStore).defaultTopK(1).build();
+
+		assertThat(advisor).isNotNull();
+	}
+
+	@Test
+	void whenBuilderWithLargeTopKThenSuccess() {
+		VectorStore vectorStore = Mockito.mock(VectorStore.class);
+
+		VectorStoreChatMemoryAdvisor advisor = VectorStoreChatMemoryAdvisor.builder(vectorStore)
+			.defaultTopK(1000)
+			.build();
+
+		assertThat(advisor).isNotNull();
+	}
+
+	@Test
+	void whenBuilderCalledMultipleTimesWithSameVectorStoreThenSuccess() {
+		VectorStore vectorStore = Mockito.mock(VectorStore.class);
+
+		VectorStoreChatMemoryAdvisor advisor1 = VectorStoreChatMemoryAdvisor.builder(vectorStore).build();
+		VectorStoreChatMemoryAdvisor advisor2 = VectorStoreChatMemoryAdvisor.builder(vectorStore).build();
+
+		assertThat(advisor1).isNotNull();
+		assertThat(advisor2).isNotNull();
+		assertThat(advisor1).isNotSameAs(advisor2);
+	}
+
+	@Test
+	void whenBuilderWithCustomSchedulerThenSuccess() {
+		VectorStore vectorStore = Mockito.mock(VectorStore.class);
+		Scheduler customScheduler = Mockito.mock(Scheduler.class);
+
+		VectorStoreChatMemoryAdvisor advisor = VectorStoreChatMemoryAdvisor.builder(vectorStore)
+			.scheduler(customScheduler)
+			.build();
+
+		assertThat(advisor).isNotNull();
+	}
+
+	@Test
+	void whenBuilderWithCustomSystemPromptTemplateThenSuccess() {
+		VectorStore vectorStore = Mockito.mock(VectorStore.class);
+		PromptTemplate customTemplate = Mockito.mock(PromptTemplate.class);
+
+		VectorStoreChatMemoryAdvisor advisor = VectorStoreChatMemoryAdvisor.builder(vectorStore)
+			.systemPromptTemplate(customTemplate)
+			.build();
+
+		assertThat(advisor).isNotNull();
+	}
+
 }