[JAVA-2590] Added example of @JdbcTest usage

persistence-modules/spring-jdbc/src/main/java/com/baeldung/spring/jdbc/template/testing/EmployeeApplication.java

@@ -0,0 +1,7 @@
+package com.baeldung.spring.jdbc.template.testing;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class EmployeeApplication {
+}

persistence-modules/spring-jdbc/src/main/java/com/baeldung/spring/jdbc/template/testing/EmployeeDAO.java

@@ -13,6 +13,10 @@ public class EmployeeDAO {
         jdbcTemplate = new JdbcTemplate(dataSource);
     }
 
+    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
+        this.jdbcTemplate = jdbcTemplate;
+    }
+
     public int getCountOfEmployees() {
         return jdbcTemplate.queryForObject("SELECT COUNT(*) FROM EMPLOYEE", Integer.class);
     }

persistence-modules/spring-jdbc/src/test/java/com/baeldung/spring/jdbc/template/testing/EmployeeDAOIntegrationTest.java

@@ -0,0 +1,24 @@
+package com.baeldung.spring.jdbc.template.testing;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.jdbc.JdbcTest;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.test.context.jdbc.Sql;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@JdbcTest
+@Sql({"schema.sql", "test-data.sql"})
+class EmployeeDAOIntegrationTest {
+    @Autowired
+    private JdbcTemplate jdbcTemplate;
+
+    @Test
+    void whenInjectInMemoryDataSource_thenReturnCorrectEmployeeCount() {
+        EmployeeDAO employeeDAO = new EmployeeDAO();
+        employeeDAO.setJdbcTemplate(jdbcTemplate);
+
+        assertEquals(4, employeeDAO.getCountOfEmployees());
+    }
+}