#32 Support for Liquibase (#97)

*  #32 Support for Liquibase
Added once more DatabasePreparer implementation - LiquibasePrepare, which support liquibase migrations

* #32 Support for Liquibase - Add missed license headers

* #32 Support for Liquibase - fix some build problems(versions,imports,etc.)

Author: malltshik

README.md

@@ -46,17 +46,25 @@ Additionally you may use the [`EmbeddedPostgres`](src/main/java/io/zonky/test/db
 
 Default username/password is: postgres/postgres and the default database is 'postgres'
 
-## Flyway Migrator
-
-You can easily integrate Flyway database schema migration:
+## Migrators (Flyway or Liquibase)
 
+You can easily integrate Flyway or Liquibase database schema migration:
+##### Flyway
 ```java
-@Rule
+@Rule 
 public PreparedDbRule db =
     EmbeddedPostgresRules.preparedDatabase(
         FlywayPreparer.forClasspathLocation("db/my-db-schema"));
 ```
 
+##### Liquibase
+```java
+@Rule
+public PreparedDbRule db = 
+    EmbeddedPostgresRules.preparedDatabase(
+            LiquibasePreparer.forClasspathLocation("liqui/master.xml"));
+```
+
 This will create an independent database for every test with the given schema loaded from the classpath.
 Database templates are used so the time cost is relatively small, given the superior isolation truly
 independent databases gives you.

pom.xml

@@ -137,6 +137,12 @@
             <version>5.0.7</version>
             <optional>true</optional>
         </dependency>
+        <dependency>
+            <groupId>org.liquibase</groupId>
+            <artifactId>liquibase-core</artifactId>
+            <version>3.6.3</version>
+            <optional>true</optional>
+        </dependency>
         <dependency>
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>

src/main/java/io/zonky/test/db/postgres/embedded/LiquibasePreparer.java

@@ -0,0 +1,69 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.zonky.test.db.postgres.embedded;
+
+import liquibase.Contexts;
+import liquibase.Liquibase;
+import liquibase.database.Database;
+import liquibase.database.jvm.JdbcConnection;
+import liquibase.exception.LiquibaseException;
+import liquibase.resource.ClassLoaderResourceAccessor;
+
+import javax.sql.DataSource;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.Objects;
+
+import static liquibase.database.DatabaseFactory.getInstance;
+
+public final class LiquibasePreparer implements DatabasePreparer {
+
+    private final String location;
+
+    public static LiquibasePreparer forClasspathLocation(String location) {
+        return new LiquibasePreparer(location);
+    }
+
+    private LiquibasePreparer(String location) {
+        this.location = location;
+    }
+
+    @Override
+    public void prepare(DataSource ds) throws SQLException {
+        Connection connection = null;
+        try {
+            connection = ds.getConnection();
+            Database database = getInstance().findCorrectDatabaseImplementation(new JdbcConnection(connection));
+            Liquibase liquibase = new Liquibase(location, new ClassLoaderResourceAccessor(), database);
+            liquibase.update(new Contexts());
+        } catch (LiquibaseException e) {
+            throw new SQLException(e);
+        } finally {
+            if (connection != null) {
+                connection.rollback();
+                connection.close();
+            }
+        }
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return obj instanceof LiquibasePreparer && Objects.equals(location, ((LiquibasePreparer) obj).location);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(location);
+    }
+}

src/test/java/io/zonky/test/db/postgres/embedded/LiquibasePreparerTest.java

@@ -0,0 +1,41 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.zonky.test.db.postgres.embedded;
+
+import io.zonky.test.db.postgres.junit.EmbeddedPostgresRules;
+import io.zonky.test.db.postgres.junit.PreparedDbRule;
+import org.junit.Rule;
+import org.junit.Test;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.Statement;
+
+import static org.junit.Assert.assertEquals;
+
+public class LiquibasePreparerTest {
+
+    @Rule
+    public PreparedDbRule db = EmbeddedPostgresRules.preparedDatabase(LiquibasePreparer.forClasspathLocation("liqui/master.xml"));
+
+    @Test
+    public void testTablesMade() throws Exception {
+        try (Connection c = db.getTestDatabase().getConnection();
+                Statement s = c.createStatement()) {
+            ResultSet rs = s.executeQuery("SELECT * FROM foo");
+            rs.next();
+            assertEquals("bar", rs.getString(1));
+        }
+    }
+}

src/test/resources/liqui/master.xml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+~   Licensed under the Apache License, Version 2.0 (the "License");
+~   you may not use this file except in compliance with the License.
+~   You may obtain a copy of the License at
+~
+~   http://www.apache.org/licenses/LICENSE-2.0
+~
+~   Unless required by applicable law or agreed to in writing, software
+~   distributed under the License is distributed on an "AS IS" BASIS,
+~   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+~   See the License for the specific language governing permissions and
+~   limitations under the License.
+-->
+<databaseChangeLog
+        xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.1.xsd">
+
+    <preConditions>
+        <dbms type="postgresql"/>
+    </preConditions>
+
+    <changeSet id="11122018140410" author="artem.gavrilov">
+        <comment>Create table `foo`</comment>
+        <sql>
+            CREATE TABLE foo (test VARCHAR);
+        </sql>
+    </changeSet>
+
+    <changeSet id="11122018140810" author="artem.gavrilov">
+        <comment>Fill `foo` table</comment>
+        <sql>INSERT INTO foo VALUES('bar');</sql>
+    </changeSet>
+
+</databaseChangeLog>