Jaypie Testkit 🐦‍⬛🫒

Test utilities built for Jaypie

📋 Usage

Installation

npm install --save-dev @jaypie/testkit

Example

Log Spying

import { restoreLog, spyLog } from "@jaypie/testkit";
import { log } from "@jaypie/core";

beforeEach(() => {
  spyLog(log);
});
afterEach(() => {
  restoreLog(log);
  vi.clearAllMocks();
});

test("log", () => {
  log.warn("Danger");
  expect(log.warn).toHaveBeenCalled();
  expect(log.error).not.toHaveBeenCalled();
});

👺 Logging Conventions:

• Only use log.trace or log.var during "happy path"
• Use log.debug for edge cases
• Now you can add an "observability" test that will fail as soon as new code triggers an unexpected edge condition

describe("Observability", () => {
  it("Does not log above trace", async () => {
    // Arrange
    // TODO: "happy path" setup
    // Act
    await myNewFunction(); // TODO: add any "happy path" parameters
    // Assert
    expect(log.debug).not.toHaveBeenCalled();
    expect(log.info).not.toHaveBeenCalled();
    expect(log.warn).not.toHaveBeenCalled();
    expect(log.error).not.toHaveBeenCalled();
    expect(log.fatal).not.toHaveBeenCalled();
  });
});

👺 Follow the "arrange, act, assert" pattern

Test Matchers

testSetup.js

import { matchers as jaypieMatchers } from "@jaypie/testkit";
import * as extendedMatchers from "jest-extended";
import { expect } from "vitest";

expect.extend(extendedMatchers);
expect.extend(jaypieMatchers);

test.spec.js

import { ConfigurationError } from "@jaypie/core";

const error = new ConfigurationError();
const json = error.json();
expect(error).toBeJaypieError();
expect(json).toBeJaypieError();

📖 Reference

import { 
  LOG,
  jsonApiErrorSchema,
  jsonApiSchema,
  matchers,
  mockLogFactory,
  restoreLog,
  spyLog,
} from '@jaypie/testkit'

LOG

LOG constant provided by @jaypie/core for convenience

import { log } from "@jaypie/core";
import { LOG } from "@jaypie/testkit";

const libLogger = log.lib({ level: LOG.LEVEL.WARN, lib: "myLib" });

jsonApiErrorSchema

A JSON Schema validator for the JSON:API error schema. Powers the toBeJaypieError matcher (via toMatchSchema).

jsonApiSchema

A JSON Schema validator for the JSON:API data schema.

matchers

testSetup.js

import { matchers as jaypieMatchers } from "@jaypie/testkit";
import * as extendedMatchers from "jest-extended";
import { expect } from "vitest";

expect.extend(extendedMatchers);
expect.extend(jaypieMatchers);

expect(subject).toBeJaypieError()

Validates instance objects:

try {
  throw new Error("Sorpresa!");
} catch (error) {
  expect(error).not.toBeJaypieError();
}

Validates plain old JSON:

expect({ errors: [ { status, title, detail } ] }).toBeJaypieError();

Jaypie errors, which are ProjectErrors, all have a .json() to convert

expect(subject).toBeValidSchema()

import { jsonApiErrorSchema, jsonApiSchema } from "@jaypie/testkit";

expect(jsonApiErrorSchema).toBeValidSchema();
expect(jsonApiSchema).toBeValidSchema();
expect({ project: "mayhem" }).not.toBeValidSchema();

From jest-json-schema toBeValidSchema.js (not documented in README)

expect(subject).toMatchSchema(schema)

import { jsonApiErrorSchema, jsonApiSchema } from "@jaypie/testkit";
import { ConfigurationError } from "@jaypie/core";

const error = new ConfigurationError();
const json = error.json();
expect(json).toMatchSchema(jsonApiErrorSchema);
expect(json).not.toMatchSchema(jsonApiSchema);

From jest-json-schema; see README

mockLogFactory()

Creates a mock of the log provided by @jaypie/core.

import { mockLogFactory } from "@jaypie/testkit";

const log = mockLogFactory();
log.warn("Danger");
expect(log.warn).toHaveBeenCalled();
expect(log.error).not.toHaveBeenCalled();

restoreLog(log)

Restores the log provided by @jaypie/core, commonly performed afterEach with spyLog in beforeEach. See example with spyLog.

spyLog(log)

Spies on the log provided by @jaypie/core, commonly performed beforeEach with restoreLog in afterEach.

import { restoreLog, spyLog } from "@jaypie/testkit";
import { log } from "@jaypie/core";

beforeEach(() => {
  spyLog(log);
});
afterEach(() => {
  restoreLog(log);
  vi.clearAllMocks();
});

test("log", () => {
  log.warn("Danger");
  expect(log.warn).toHaveBeenCalled();
  expect(log.error).not.toHaveBeenCalled();
});

sqsTestRecords(message, message, ...) or sqsTestRecords([...])

Generates an event object for testing SQS Lambda functions with as many messages as provided. Note, test will accept more than ten messages, but AWS will only send ten at a time.

import { sqsTestRecords } from "@jaypie/testkit";

const event = sqsTestRecords(
  { MessageId: "1", Body: "Hello, World!" },
  { MessageId: "2", Body: "Goodbye, World!" }
);

🌠 Wishlist

• matcher toBeHttpStatus
• matcher toBeJaypieAny
• matcher toBeJaypieData
• matcher toBeJaypieDataObject
• matcher toBeJaypieDataArray
• matcher toThrowJaypieError
• ...@knowdev/jest

📝 Changelog

Date	Version	Summary
3/20/2024	1.0.2	Export LOG
3/16/2024	1.0.0	Artists ship
3/15/2024	0.1.0	Initial deploy
3/15/2024	0.0.1	Initial commit

📜 License

Published by Finlayson Studio. All rights reserved