BAEL-2545 - Configuring a DataSource Programatically in Spring Boot (#6139)

* Initial Commit

* Update UserRepositoryIntegrationTest.java

* Update UserRepositoryIntegrationTest

persistence-modules/spring-boot-persistence/src/test/java/com/baeldung/springbootdatasourceconfig/tests/UserRepositoryIntegrationTest.java

@@ -0,0 +1,28 @@
+package com.baeldung.springbootdatasourceconfig.tests;
+
+import com.baeldung.springbootdatasourceconfig.application.entities.User;
+import com.baeldung.springbootdatasourceconfig.application.repositories.UserRepository;
+import java.util.List;
+import java.util.Optional;
+import org.junit.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import static org.assertj.core.api.Assertions.assertThat;
+import org.junit.runner.RunWith;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@DataJpaTest
+public class UserRepositoryIntegrationTest {
+    
+    @Autowired
+    private UserRepository userRepository;
+    
+    @Test
+    public void whenCalledSave_thenCorrectNumberOfUsers() {
+        userRepository.save(new User("Bob", "bob@domain.com"));
+        List<User> users = (List<User>) userRepository.findAll();
+        
+        assertThat(users.size()).isEqualTo(1);
+    }
+}