Application instances of the JPA Matches framework in Java Library Unit Test
Application instances of the JPA Matches framework in Java Library Unit Test
JPA Matches is a unit testing framework for Java persistence API (JPA), which provides a tool for assertion matching for JPA entity objects.When testing the unit test of the JPA class library, JPA MATCHERS can help us easily verify whether the attributes of the entity object truly reflect the expected data changes.
Through the following examples, we will understand how the JPA Matches framework is applied in the test of the Java class library.
Suppose we have a simple JPA entity user, which represents the user in the system:
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(nullable = false)
private String username;
@Column(nullable = false)
private String password;
// Methods such as omittime, Getter, and Setter
}
Now, we want to write a unit test to verify the attributes of the user entity.
First, we need to introduce the dependencies of the JPA Matches framework in the test code.Suppose we use Maven for project construction, and we can add the following dependencies to the pom.xml file:
<dependencies>
...
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>3.21.0</version>
</dependency>
<dependency>
<groupId>com.github.jsiebahn</groupId>
<artifactId>jpa-matchers-unit-test</artifactId>
<version>0.3.0</version>
<scope>test</scope>
</dependency>
...
</dependencies>
Next, we can write a simple unit test method to verify the attributes of the user entity.In the test method, we can use the `EntityAssertions` class provided by the JPA MATCHERS framework to assert and match.
import org.junit.jupiter.api.Test;
import org.assertj.core.api.Assertions;
import com.github.jsiebahn.various.tests.annotations.jpa.EntityManagerProvider;
import com.github.jsiebahn.various.tests.annotations.jpa.Jpa;
import com.github.jsiebahn.various.tests.jpa.matchers.EntityAssertions;
@Jpa(persistenceUnit = "test")
class UserTest {
@Test
@EntityManagerProvider
void testUserEntity() {
// Use the JPA MATCHERS framework to assert match
Assertions.assertThat(User.class)
.hasTableName("users")
.hasIdColumn("id")
.hasColumn("username")
.hasColumn("password")
.hasNoOtherEntityColumns();
// You can use other commonly used assertions to make more verification
User user = new User();
user.setId(1L);
user.setUsername("john.doe");
user.setPassword("password");
Assertions.assertThat(user.getId()).isEqualTo(1L);
Assertions.assertThat(user.getUsername()).isEqualTo("john.doe");
Assertions.assertThat(user.getPassword()).isEqualTo("password");
}
}
In the above examples, we first assembled the user's entity through the `EntityAssertions" class, which verified that the corresponding table name "use", "username" and "password" were verified.There are no additional physical columns.
Then, we further verify the attributes of the User entity object through the commonly used assertion method to ensure that the ID, username, and password properties are consistent with expectations.
By using the assertion matching mechanism of the JPA Matches framework, we can easily verify the attributes of the JPA entity object, quickly position the possible problems, and ensure the consistency of the data of the entity and the database.
In summary, this article introduces the application instance of the JPA Matches framework in the Java class library unit test.It provides us with a set of convenient tools that can simplify the verification process of JPA entity attributes and ensure the consistency of physical objects and database data.
