Restructure before adding class skeletons

lib/__tests__/DatabaseConnectionPool.test.js

@@ -0,0 +1,92 @@
+'use strict';
+
+const DatabaseConnectionPool = require('../DatabaseConnectionPool');
+
+jest.mock('../DatabaseConnectionPool');
+
+describe('DatabaseConnectionPool', () => {
+	test('Should instantiate connection', () => {
+		new DatabaseConnectionPool();
+
+		expect(DatabaseConnectionPool).toHaveBeenCalledTimes(1);
+	});
+
+	test('Non prepared query should not execute with params', () => {
+		const dbp = new DatabaseConnectionPool();
+
+		const sql = `SELECT * FROM class;`;
+		dbp.runQuery(sql);
+
+		expect(dbp.runQuery.mock.results[0].value).toEqual({
+			sql: sql
+		});
+	});
+
+	test('Prepared query should execute along with params', () => {
+		const dbp = new DatabaseConnectionPool();
+
+		const sql = `SELECT * FROM class where name = ?;`;
+		const params = [ 'bob' ];
+		dbp.runQuery(sql, params);
+
+		expect(dbp.runQuery.mock.results[0].value).toEqual({
+			sql: sql,
+			params: params
+		});
+	});
+
+	test('Query without trailing ; should throw error', () => {
+		const dbp = new DatabaseConnectionPool();
+
+		const sql = `SELECT * FROM class where name = ?`;
+		const params = [ 'bob' ];
+
+		expect(() => dbp.runQuery(sql, params)).toThrow();
+	});
+
+	test('Query with whitespace after ; should not fail', ()=> {
+		const dbp = new DatabaseConnectionPool();
+
+		const sql = `SELECT * FROM class;		`;
+
+		expect(() => dbp.runQuery(sql)).not.toThrow();
+	});
+
+	test('Prepared query should fail if no params are given', () => {
+		const dbp = new DatabaseConnectionPool();
+
+		const sql = `SELECT * FROM class where name = ?;`;
+
+		expect(() => dbp.runQuery(sql)).toThrow();
+	});
+
+	test('Prepared query should fail if too many params given', () => {
+		const dbp = new DatabaseConnectionPool();
+
+		const sql = `SELECT * FROM class where name = ?;`;
+		const params = [ 'bob', 'jim' ];
+
+		expect(() => dbp.runQuery(sql, params)).toThrow();
+	});
+
+	test('Prepared query should fail if too few params given', () => {
+		const dbp = new DatabaseConnectionPool();
+
+		const sql = `SELECT * FROM class where name = ?
+			and classId = ? and subjectId = ?;`;
+
+		const params = [ 'bob' ];
+
+		expect(() => dbp.runQuery(sql, params)).toThrow();
+	});
+
+	test('Non-prepared query should fail if params given', () => {
+		const dbp = new DatabaseConnectionPool();
+
+		const sql = `SELECT * FROM class;`;
+
+		const params = [ 'bob', 'jim' ];
+
+		expect(() => dbp.runQuery(sql, params)).toThrow();
+	});
+});