JarCasting
Java library that helps you to create simple embedded postgres database and make the snapshots
Add pg-snapshot-datasource to your project. For maven projects just add this dependency:
<dependency>
<groupId>com.afrunt.pgs</groupId>
<artifactId>pg-snapshot-datasource</artifactId>
<version>0.1</version>
</dependency>
Usage
package com.afrunt.pgs.test;
import com.afrunt.pgs.PgSnapshot;
import com.afrunt.pgs.PgSnapshotDataSource;
import org.junit.jupiter.api.Test;
import org.springframework.jdbc.BadSqlGrammarException;
import org.springframework.jdbc.core.JdbcTemplate;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatThrownBy;
public class PgSnapshotDataSourceTest {
@Test
public void testSnapshotCreateRestore() throws Exception {
PgSnapshotDataSource dataSource = new PgSnapshotDataSource();
PgSnapshot initialState = dataSource.createSnapshot("Initial state");
JdbcTemplate jdbc = new JdbcTemplate(dataSource);
jdbc.execute("CREATE TABLE dummy(id bigint PRIMARY KEY)");
for (int i = 0; i < 10; i++) {
final var id = i;
jdbc.update("INSERT INTO dummy (id) VALUES (?)", ps -> ps.setInt(1, id));
}
assertThat(jdbc.queryForObject("SELECT COUNT(*) FROM dummy", Integer.class)).isEqualTo(10);
PgSnapshot mutatedState = dataSource.createSnapshot("Mutated state");
dataSource.restoreFromSnapshot(initialState);
assertThatThrownBy(() -> jdbc.queryForObject("SELECT COUNT(*) FROM dummy", Integer.class)).isInstanceOf(BadSqlGrammarException.class);
dataSource.restoreFromSnapshot(mutatedState);
assertThat(jdbc.queryForObject("SELECT COUNT(*) FROM dummy", Integer.class)).isEqualTo(10);
dataSource.close();
}
}