@theledger/fabric-mock-stub

fabric-mock-stub

A Node.js module that helps you to test your Hyperledger Fabric nodejs chaincode.

• docs
• example usage

Table of contents

• Installation
• Usage
• Contributing
• Credits
• License

Installation

yarn add @theledger/fabric-mock-stub

Usage

ChaincodeMockStub View definition

This ChaincodeMockStub is a Mock implementation of the fabric-shim stub. This means you can test your chaincode without actually starting your network.

Examples are located at examples/tests

!! Following methods are not (yet) implemented and will not work !!

• getHistoryForKey
• getBinding
• getTransient
• setEvent
• getChannelID

How to test

Testing NodeJS chaincode works similarly to testing using the mockstub in the GOlang chaincode.

The ChaincodeMockStub has 2 important mock functions mockInitand mockInvoke. By passing your chaincode, it will mock a transaction and execute a invoke/init similarly to how it will originally be called. Both these functions will return a ChaincodeResponse. Using this ChaincodeResponse object, we can test whether or not the action returned an expected result.

On success, this response will look like this. If the method returns something, the reponse will also contain a payload.

{
    "status": 200,
    "payload": <Buffer_with_your_data>
}

On error, this response will look like this.

{
    "status": 200,
    "message": <Buffer_with_your_error_message>
}

You'll be able to validate the reponse using something like chai.

// Validate reponse status
expect(response.status).to.eql(200)
// Validate payload - using `Transform.bufferToObject` because we recieve the payload as a buffer
expect(Transform.bufferToObject(response.payload).owner).to.eql("newOwner")

Include your chaincode

At the top of your test file, your can import and instantiate your chaincode, this only has to be done once.

import { MyChaincode } from '../<path_to_your_chaincode_class>';

// You always need your chaincode so it knows which chaincode to invoke on
const chaincode = new MyChaincode();

Include the mockstub

After this, in your tests, you can create a new mockstub. You have to pass a random name (not that important) and your chaincode. It's up to you if you want to create a new mockstub for each test, which runs those tests with an empty state. Or use one for all the tests. If you reuse the same stub, you also reuse the previous tests state.

import { ChaincodeMockStub, Transform } from "@theledger/fabric-mock-stub";

const stub = new ChaincodeMockStub("MyMockStub", chaincode);

Example

import { MyChaincode } from '../<path_to_your_chaincode_class>';
import { ChaincodeMockStub, Transform } from "@theledger/fabric-mock-stub";

// You always need your chaincode so it knows which chaincode to invoke on
const chaincode = new MyChaincode();

describe('Test MyChaincode', () => {

    it("Should init without issues", async () => {
        const stub = new ChaincodeMockStub("MyMockStub", chaincode);

        // Your test code
    });
});

Test Init

The Init()method can be tested using the mockStub.mockInit(txId: string, args: string[]) function. It will create a new mock transaction and call the init method on your chaincode. Since the init happens when instantiating your chaincode, you generally don't want it to return anything. So we check for the response status here.

import { MyChaincode } from '../<path_to_your_chaincode_class>';
import { ChaincodeMockStub, Transform } from "@theledger/fabric-mock-stub";

// You always need your chaincode so it knows which chaincode to invoke on
const chaincode = new MyChaincode();

describe('Test MyChaincode', () => {

    it("Should init without issues", async () => {
        const mockStub = new ChaincodeMockStub("MyMockStub", chaincode);

        const response = await mockStub.mockInit("tx1", []);

        expect(response.status).to.eql(200)
    });
});

Test Invoke

The Invoke()method can be tested using the mockStub.mockInvoke(txId: string, args: string[]) function. It will create a new mock transaction and call the invoke method on your chaincode. The client will either send a query or an invoke, but the chaincode will accept these both as invoke. In your tests there isn't any difference, both invokes and queries can return a result.

Test queryCar

import { MyChaincode } from '../<path_to_your_chaincode_class>';
import { ChaincodeMockStub, Transform } from "@theledger/fabric-mock-stub";

// You always need your chaincode so it knows which chaincode to invoke on
const chaincode = new MyChaincode();

describe('Test MyChaincode', () => {

    it("Should query car", async () => {
        const mockStub = new ChaincodeMockStub("MyMockStub", chaincode);
        
        const response = await mockStub.mockInvoke("tx2", ['queryCar', `CAR0`]);

        expect(Transform.bufferToObject(response.payload)).to.deep.eq({
            'make': 'prop1',
            'model': 'prop2',
            'color': 'prop3',
            'owner': 'owner',
            'docType': 'car'
        });
    });
});

Test createCar

import { MyChaincode } from '../<path_to_your_chaincode_class>';
import { ChaincodeMockStub, Transform } from "@theledger/fabric-mock-stub";

// You always need your chaincode so it knows which chaincode to invoke on
const chaincode = new MyChaincode();

describe('Test MyChaincode', () => {

    it("Should be able to add car", async () => {
        const mockStub = new ChaincodeMockStub("MyMockStub", chaincode);

        const response = await mockStub.mockInvoke("tx1", ['createCar', `CAR0`, `prop1`, `prop2`, `prop3`, `owner`]);

        expect(response.status).to.eql(200)

        const response = await mockStub.mockInvoke("tx1", ['queryCar', `CAR0`]);

        expect(Transform.bufferToObject(response.payload)).to.deep.eq({
            'make': 'prop1',
            'model': 'prop2',
            'color': 'prop3',
            'owner': 'owner',
            'docType': 'car'
        })
    });
});

Testing individual classes

You are not required to only test using the mockInvoke and mockInit. You can directly call the methods on your chaincode or on the mockStub if you really want to.

Testing using Mychaincode directly

A remark when using this, depending what you return in your function, you will be able to recieve a Buffer or an object in your tests. This is discussed in chaincode

import { MyChaincode } from '../<path_to_your_chaincode_class>';
import { ChaincodeMockStub, Transform } from "@theledger/fabric-mock-stub";

// You always need your chaincode so it knows which chaincode to invoke on
const chaincode = new MyChaincode();

describe('Test MyChaincode', () => {

    it("Should be able to add car", async () => {
        const stub = new ChaincodeMockStub("MyMockStub", chaincode);

        const car0 = {
            'make': 'Toyota',
            'model': 'Prius',
            'color': 'blue',
            'owner': 'Tomoko',
            'docType': 'car'
        };

        const car = await chaincode.queryCar(stub, new TransactionHelper(stub), ["CAR0"])

        expect(car).to.deep.equal(car0);
    });
});

Testing using ChaincodeMockStub directly 🤨

You can do this, but you shouldn't. Your logic should be written in your functions, not your tests.

import { MyChaincode } from '../<path_to_your_chaincode_class>';
import { ChaincodeMockStub, Transform } from "@theledger/fabric-mock-stub";

// You always need your chaincode so it knows which chaincode to invoke on
const chaincode = new MyChaincode();

describe('Test MyChaincode', () => {

    it("Should be able to add car", async () => {
        const mockStub = new ChaincodeMockStub("MyMockStub", chaincode);

        const query = {
            selector: {
                model: {
                    "$in": ['Nano', "Punto"]
                }
            }
        };

        const it = await mockStub.getQueryResult(JSON.stringify(query));

        const items = await Transform.iteratorToList(it);

        expect(items).to.be.length(2)
    });
});

Contributing

1. Fork it! 🍴
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request 😁 🎉

Credits

• Developer - Jo (@jestersimpps)
• Developer - Jonas (@Superjo149)
• Company - TheLedger (theledger.be)

License

The MIT License (MIT)

Copyright (c) 2018 TheLedger

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.