fix(sqlite): close connection properly and cleanup files (#9851)

lib/dialects/sqlite/connection-manager.js

@@ -33,6 +33,15 @@ class ConnectionManager extends AbstractConnectionManager {
     this.refreshTypeParser(dataTypes);
     this.refreshTypeParser(dataTypes);
   }
   }
 
 
+  _onProcessExit() {
+    const promises = Object.getOwnPropertyNames(this.connections)
+      .map(connection => Promise.fromCallback(callback => this.connections[connection].close(callback)));
+
+    return Promise
+      .all(promises)
+      .then(() => super._onProcessExit.call(this));
+  }
+
   // Expose this as a method so that the parsing may be updated when the user has added additional, custom types
   // Expose this as a method so that the parsing may be updated when the user has added additional, custom types
   _refreshTypeParser(dataType) {
   _refreshTypeParser(dataType) {
     parserStore.refresh(dataType);
     parserStore.refresh(dataType);

test/integration/dialects/sqlite/connection-manager.test.js

+'use strict';
+
+const chai = require('chai');
+const fs = require('fs');
+const path = require('path');
+const expect = chai.expect;
+const Support = require(__dirname + '/../../support');
+const dialect = Support.getTestDialect();
+const DataTypes = require(__dirname + '/../../../../lib/data-types');
+
+const fileName = Math.random() + '_test.sqlite';
+
+if (dialect === 'sqlite') {
+  describe('[SQLITE Specific] Connection Manager', () => {
+    after(() => {
+      fs.unlinkSync(path.join(__dirname, fileName));
+    });
+
+    it('close connection and remove journal and wal files', function() {
+      const sequelize = Support.createSequelizeInstance({
+        storage: path.join(__dirname, fileName)
+      });
+      const User = sequelize.define('User', { username: DataTypes.STRING });
+
+      return User
+        .sync({ force: true })
+        .then(() => sequelize.query('PRAGMA journal_mode = WAL'))
+        .then(() => User.create({ username: 'user1' }))
+        .then(() => {
+          return sequelize.transaction(transaction => {
+            return User.create({ username: 'user2' }, { transaction });
+          });
+        })
+        .then(() => {
+          expect(fs.existsSync(path.join(__dirname, fileName))).to.be.true;
+          expect(fs.existsSync(path.join(__dirname, `${fileName}-shm`)), 'shm file should exists').to.be.true;
+          expect(fs.existsSync(path.join(__dirname, `${fileName}-wal`)), 'wal file should exists').to.be.true;
+        
+          return sequelize.close();
+        })
+        .then(() => {
+          expect(fs.existsSync(path.join(__dirname, fileName))).to.be.true;
+          expect(fs.existsSync(path.join(__dirname, `${fileName}-shm`)), 'shm file exists').to.be.false;
+          expect(fs.existsSync(path.join(__dirname, `${fileName}-wal`)), 'wal file exists').to.be.false;
+          
+          return this.sequelize.query('PRAGMA journal_mode = DELETE');
+        });
+    });
+  });
+}