add H2 migration tool

commafeed-server/src/test/java/com/commafeed/backend/service/db/H2MigrationServiceTest.java

@@ -0,0 +1,29 @@
+package com.commafeed.backend.service.db;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Objects;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+class H2MigrationServiceTest {
+
+	@TempDir
+	private Path root;
+
+	@Test
+	void testMigrateIfNeeded() throws IOException {
+		Path path = root.resolve("database.mv.db");
+		Files.copy(Objects.requireNonNull(getClass().getResourceAsStream("/h2-migration/database-v2.1.214.mv.db")), path);
+
+		H2MigrationService service = new H2MigrationService();
+		Assertions.assertEquals(2, service.getH2FileFormat(path));
+
+		service.migrateIfNeeded(path, "sa", "sa");
+		Assertions.assertEquals(3, service.getH2FileFormat(path));
+	}
+
+}