first commit

spring-boot-modules/spring-boot-autoconfiguration/src/test/java/com/baeldung/conditionalonproperty/NotificationUnitTest.java

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+package com.baeldung.conditionalonproperty;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+
+import com.baeldung.conditionalonproperty.config.NotificationConfig;
+import com.baeldung.conditionalonproperty.service.EmailNotification;
+import com.baeldung.conditionalonproperty.service.NotificationSender;
+
+public class NotificationUnitTest {
+
+    private final ApplicationContextRunner contextRunner = new ApplicationContextRunner();
+
+    @Test
+    public void whenValueSetToEmail_thenCreateEmailNotification() {
+        this.contextRunner.withPropertyValues("notification.service=email")
+            .withUserConfiguration(NotificationConfig.class)
+            .run(context -> {
+                assertThat(context).hasBean("emailNotification");
+                NotificationSender notificationSender = context.getBean(EmailNotification.class);
+                assertThat(notificationSender.send("Hello From Baeldung!")).isEqualTo("Email Notification: Hello From Baeldung!");
+                assertThat(context).doesNotHaveBean("smsNotification");
+            });
+    }
+}