diff --git a/tests/SqlCommandWorker.test.js b/tests/SqlCommandWorker.test.js
new file mode 100644
index 0000000..2aac495
--- /dev/null
+++ b/tests/SqlCommandWorker.test.js
@@ -0,0 +1,129 @@
+'use strict';
+
+const SqlCommandWorker = require('../lib/SqlCommandWorker.js');
+
+describe('SqlCommandWorker tests', () => {
+    test('beginTransaction failed', () => {
+        const connection = {
+            beginTransaction: jest.fn((callback) => {
+                callback('transaction error');
+            }),
+        };
+        const sqlCommandWorker = new SqlCommandWorker();
+        const commandList = [
+            'INSERT INTO idea_db.job (name) values ("foo");',
+            'INSERT INTO idea_db.job (name) values ("bar");',
+        ];
+
+        return sqlCommandWorker.executeCommandsAsync(connection, commandList)
+            .then((result) => {
+                expect(result).toBe();
+            })
+            .catch((err) => {
+                expect(err).toBe('transaction error');
+            });
+    });
+    test('command failed', () => {
+        const connection = {
+            beginTransaction: jest.fn((callback) => {
+                callback(undefined);
+            }),
+            query: jest.fn((query, callback) => callback('command error')),
+            rollback: jest.fn((callback) => {
+                callback();
+            }),
+        };
+        const sqlCommandWorker = new SqlCommandWorker();
+        const commandList = [
+            'INSERT INTO idea_db.job (name) values ("foo");',
+            'INSERT INTO idea_db.job (name) values ("bar");',
+        ];
+
+        return sqlCommandWorker.executeCommandsAsync(connection, commandList)
+            .then((result) => {
+                expect(result).toBe();
+            })
+            .catch((err) => {
+                expect(err).toBe('command error');
+            });
+    });
+    test('commit failed', () => {
+        const fakeResult = {
+            affectedRows: 1,
+            changedRows: 1,
+            insertId: 'hello',
+        };
+        const connection = {
+            beginTransaction: jest.fn((callback) => {
+                callback(undefined);
+            }),
+            commit: jest.fn((callback) => {
+                callback('commit failed');
+            }),
+            rollback: jest.fn((callback) => {
+                callback();
+            }),
+            query: jest.fn((query, callback) => {
+                callback(undefined, fakeResult);
+            }),
+        };
+        const sqlCommandWorker = new SqlCommandWorker();
+        const commandList = [
+            'INSERT INTO idea_db.job (name) values ("foo");',
+            'INSERT INTO idea_db.job (name) values ("bar");',
+        ];
+
+        return sqlCommandWorker.executeCommandsAsync(connection, commandList)
+            .then((results) => {
+                expect(results).toBe();
+            })
+            .catch((err) => {
+                expect(err).toBe('commit failed');
+            });
+    });
+    test('commands succeeded', () => {
+        const fakeResult = {
+            affectedRows: 1,
+            changedRows: 1,
+            insertId: 'hello',
+        };
+        const connection = {
+            beginTransaction: jest.fn((callback) => {
+                callback(undefined);
+            }),
+            commit: jest.fn((callback) => {
+                callback(undefined);
+            }),
+            query: jest.fn((query, callback) => {
+                callback(undefined, fakeResult);
+            }),
+        };
+        const sqlCommandWorker = new SqlCommandWorker();
+        const commandList = [
+            'INSERT INTO idea_db.job (name) values ("foo");',
+            'INSERT INTO idea_db.job (name) values ("bar");',
+        ];
+
+        return sqlCommandWorker.executeCommandsAsync(connection, commandList)
+            .then((results) => {
+                expect(results).toBeDefined();
+                expect(results.length).toBe(2);
+                for (let result of results) {
+                    let commandResult;
+                    if (result.Command1) {
+                        commandResult = result.Command1;
+                    } else if (result.Command2) {
+                        commandResult = result.Command2;
+                    } else {
+                        expect(commandResult).toBeDefined();
+                    }
+                    expect(commandResult.affectedRows).toBe(1);
+                    expect(commandResult.changedRows).toBe(1);
+                    expect(commandResult.insertedId).toBe('hello');
+                }
+            })
+            .catch((err) => {
+                expect(err).toBe();
+            });
+    });
+});
diff --git a/tests/SqlConnectionManager.test.js b/tests/SqlConnectionManager.test.js
new file mode 100644
index 0000000..5bac7c8
--- /dev/null
+++ b/tests/SqlConnectionManager.test.js
@@ -0,0 +1,77 @@
+'use strict';
+
+const SqlConnectionManager = require('../lib/SqlConnectionManager.js');
+
+describe('SqlConnectionManager tests', () => {
+    test('open connection failed', () => {
+        const connection = {
+            connect: jest.fn((callback) => callback('connection error')),
+        };
+        const connectionFactory = {
+            createInstance: jest.fn(() => connection),
+        };
+    const sqlConnectionManager = new SqlConnectionManager(connectionFactory);
+        const sqlFuncPromise = ()=> Promise.resolve('hello');
+        return sqlConnectionManager.executeAsync(sqlFuncPromise)
+            .then((result) => {
+                expect(result).toBe();
+            })
+            .catch((err) => {
+                expect(err).toBe('connection error');
+            });
+    });
+    test('close connection failed', () => {
+        const connection = {
+            connect: jest.fn((callback) => callback(undefined)),
+            end: jest.fn((callback) => callback('connection error')),
+        };
+        const connectionFactory = {
+            createInstance: jest.fn(() => connection),
+        };
+    const sqlConnectionManager = new SqlConnectionManager(connectionFactory);
+        const sqlFuncPromise = ()=> Promise.resolve('hello');
+        return sqlConnectionManager.executeAsync(sqlFuncPromise)
+            .then((result) => {
+                expect(result).toBe();
+            })
+            .catch((err) => {
+                expect(err).toBe('connection error');
+            });
+    });
+    test('query failed', () => {
+        const connection = {
+            connect: jest.fn((callback) => callback(undefined)),
+            end: jest.fn((callback) => callback(undefined)),
+        };
+        const connectionFactory = {
+            createInstance: jest.fn(() => connection),
+        };
+    const sqlConnectionManager = new SqlConnectionManager(connectionFactory);
+        const sqlFuncPromise = ()=> Promise.reject('query error');
+        return sqlConnectionManager.executeAsync(sqlFuncPromise)
+            .then((result) => {
+                expect(result).toBe();
+            })
+            .catch((err) => {
+                expect(err).toBe('query error');
+            });
+    });
+    test('query succeeded', () => {
+        const connection = {
+            connect: jest.fn((callback) => callback(undefined)),
+            end: jest.fn((callback) => callback(undefined)),
+        };
+        const connectionFactory = {
+            createInstance: jest.fn(() => connection),
+        };
+    const sqlConnectionManager = new SqlConnectionManager(connectionFactory);
+        const sqlFuncPromise = ()=> Promise.resolve('query succeeded');
+        return sqlConnectionManager.executeAsync(sqlFuncPromise)
+            .then((result) => {
+                expect(result).toBe('query succeeded');
+            })
+            .catch((err) => {
+                expect(err).toBe();
+            });
+    });
+});