#342: add database migration tests

test/database/drift_schemas/drift_schema_v1.json

@@ -0,0 +1 @@
+{"_meta":{"description":"This file contains a serialized version of schema entities for drift.","version":"1.1.0"},"options":{"store_date_time_values_as_text":false},"entities":[{"id":0,"references":[],"type":"table","data":{"name":"db_todo_table","was_declared_in_moor":false,"columns":[{"name":"id","getter_name":"id","moor_type":"int","nullable":false,"customConstraints":null,"defaultConstraints":"PRIMARY KEY AUTOINCREMENT","default_dart":null,"default_client_dart":null,"dsl_features":["auto-increment"]},{"name":"title","getter_name":"title","moor_type":"string","nullable":false,"customConstraints":null,"default_dart":null,"default_client_dart":null,"dsl_features":[]},{"name":"completed","getter_name":"completed","moor_type":"bool","nullable":false,"customConstraints":null,"defaultConstraints":"CHECK (\"completed\" IN (0, 1))","default_dart":null,"default_client_dart":null,"dsl_features":[]}],"is_virtual":false,"without_rowid":false,"constraints":[]}}]}

test/database/flutter_template_database_test.dart

@@ -6,7 +6,7 @@ import 'package:flutter_test/flutter_test.dart';
 /// The schema version of the database that is being tested.
 /// Update this when a new migration is added.
 /// Also run ./tool/save_database_schema.sh to create the latest version schema file.
-const schemaVersion = 32;
+const schemaVersion = 1;
 
 void main() {
   late FlutterTemplateDatabase sut;

test/database/flutter_template_migration_test.dart

@@ -5,6 +5,7 @@ import 'package:flutter_template/database/flutter_template_database.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 import 'flutter_template_database_test.dart';
+import 'schema_versions/schema.dart';
 
 
 void main() {

test/database/schema_versions/schema.dart

@@ -0,0 +1,18 @@
+// GENERATED CODE, DO NOT EDIT BY HAND.
+// ignore_for_file: type=lint
+//@dart=2.12
+import 'package:drift/drift.dart';
+import 'package:drift/internal/migrations.dart';
+import 'schema_v1.dart' as v1;
+
+class GeneratedHelper implements SchemaInstantiationHelper {
+  @override
+  GeneratedDatabase databaseForVersion(QueryExecutor db, int version) {
+    switch (version) {
+      case 1:
+        return v1.DatabaseAtV1(db);
+      default:
+        throw MissingSchemaException(version, const {1});
+    }
+  }
+}

test/database/schema_versions/schema_v1.dart

@@ -0,0 +1,57 @@
+// GENERATED CODE, DO NOT EDIT BY HAND.
+// ignore_for_file: type=lint
+//@dart=2.12
+import 'package:drift/drift.dart';
+
+class DbTodoTable extends Table with TableInfo {
+  @override
+  final GeneratedDatabase attachedDatabase;
+  final String? _alias;
+  DbTodoTable(this.attachedDatabase, [this._alias]);
+  late final GeneratedColumn<int> id = GeneratedColumn<int>(
+      'id', aliasedName, false,
+      hasAutoIncrement: true,
+      type: DriftSqlType.int,
+      requiredDuringInsert: false,
+      defaultConstraints:
+          GeneratedColumn.constraintIsAlways('PRIMARY KEY AUTOINCREMENT'));
+  late final GeneratedColumn<String> title = GeneratedColumn<String>(
+      'title', aliasedName, false,
+      type: DriftSqlType.string, requiredDuringInsert: true);
+  late final GeneratedColumn<bool> completed = GeneratedColumn<bool>(
+      'completed', aliasedName, false,
+      type: DriftSqlType.bool,
+      requiredDuringInsert: true,
+      defaultConstraints:
+          GeneratedColumn.constraintIsAlways('CHECK ("completed" IN (0, 1))'));
+  @override
+  List<GeneratedColumn> get $columns => [id, title, completed];
+  @override
+  String get aliasedName => _alias ?? actualTableName;
+  @override
+  String get actualTableName => $name;
+  static const String $name = 'db_todo_table';
+  @override
+  Set<GeneratedColumn> get $primaryKey => {id};
+  @override
+  Never map(Map<String, dynamic> data, {String? tablePrefix}) {
+    throw UnsupportedError('TableInfo.map in schema verification code');
+  }
+
+  @override
+  DbTodoTable createAlias(String alias) {
+    return DbTodoTable(attachedDatabase, alias);
+  }
+}
+
+class DatabaseAtV1 extends GeneratedDatabase {
+  DatabaseAtV1(QueryExecutor e) : super(e);
+  late final DbTodoTable dbTodoTable = DbTodoTable(this);
+  @override
+  Iterable<TableInfo<Table, Object?>> get allTables =>
+      allSchemaEntities.whereType<TableInfo<Table, Object?>>();
+  @override
+  List<DatabaseSchemaEntity> get allSchemaEntities => [dbTodoTable];
+  @override
+  int get schemaVersion => 1;
+}