Testing utility to mock the Chronik indexer client and support unit tests that need to mock chronik related API calls.

Import the MockChronikClient module via relative path along with any desired mock objects from /mocks/mockChronikResponses.

const { MockChronikClient } = require('/index');
// Import any mock responses from '/mocks/mockChronikResponses'
const ecashaddr = require('ecashaddrjs');
const mockedChronik = new MockChronikClient();

Mocking API Responses

Chronik-client APIs which don't rely on a preceding .script() call can use the .setMock() function to inject the mock API response.

This includes:

• .block()
• .tx()
• .token()
• .blockchainInfo()
• .broadcastTx()
• .ws()

Example: mocking the chronik.token() call

const { mockTokenInfo } = require('/mocks/mockChronikResponses');
// Initialize chronik mock with token info
mockedChronik.setMock('token', {
	input: 'some token ID',
	output: mockTokenInfo,
});

// Execute the API call
const result = await mockedChronik.token('some token ID');
assert.deepEqual(result, mockTokenInfo);

Chronik-client APIs which do rely on a preceding .script() call will need to firstly set the intended script (address type and hash) before setting the specific mock function.

This includes:

• .script().utxos()
• .script().history()

Example: mocking the chronik.script(type, hash).utxos() call

const { mockP2pkhUtxos } = require('/mocks/mockChronikResponses');
// Initialize chronik mock with script and utxo info
const P2PKH_ADDRESS = 'ecash:qzth8qvakhr6y8zcefdrvx30zrdmt2z2gvp7zc5vj8';
const { type, hash } = ecashaddr.decode(P2PKH_ADDRESS, true);
mockedChronik.setScript(type, hash);
mockedChronik.setUtxos(type, hash, mockP2pkhUtxos);

// Execute the API call
const result = await mockedChronik.script(type, hash).utxos();
assert.deepEqual(result, mockP2pkhUtxos);

Mocking API Errors

To test your app's behavior in handling an API error from Chronik, simply set an Error object as the mock output.

Example: mocking an error from the chronik.broadcastTx() call

const mockInvalidRawTxHex = 'not a valid raw tx hex';
const expectedError = new Error('Bad response from Chronik');
mockedChronik.setMock('broadcastTx', {
	input: mockInvalidRawTxHex,
	output: expectedError,
});

// Execute the API call
await assert.rejects(
	async () => {
		await mockedChronik.broadcastTx(mockInvalidRawTxHex);
	},
	expectedError,
);

If you have any implementation questions regarding this mock tool please check the test suite in /test/index.test.js or feel free to reach out to the development team via the eCash Development Telegram.

1.1.0

• Add support to in-node subscribeToBlocks method and check flag, isSubscribedBlocks

1.1.1

• Patch error tests

1.2.0

• Add support to calls by address(address) returning same as script(type, hash)

1.3.0

• Add support for subscribeToAddress and unsubscribeFromAddress websocket methods

1.4.0

• Add support for ws.unsubscribe method and fix errors in ws tests

1.4.1

• Patch repo path in package.json

1.5.0

• Add support for ws subscribe methods and shape found in in-node chronik-client

1.6.0

• Match shape of subs object in ChronikClientNode for ChronikClientNode ws methods and support unsubscribe from blocks

1.7.0

• Allow getting and setting utxos() and history() by tokenId

1.8.0

• Allow getting history without specifying pageNumber or pageSize