145 lines
5.3 KiB
Markdown
145 lines
5.3 KiB
Markdown
# @push.rocks/smartexpect
|
|
manage expectations in code
|
|
|
|
## Install
|
|
|
|
To install `@push.rocks/smartexpect`, use the following command in your terminal:
|
|
|
|
```bash
|
|
npm install @push.rocks/smartexpect --save
|
|
```
|
|
|
|
This will add `@push.rocks/smartexpect` to your project's dependencies. Make sure you're inside your project directory before running this command.
|
|
|
|
## Usage
|
|
|
|
`@push.rocks/smartexpect` is a TypeScript library designed to manage expectations in your code effectively, improving testing readability and maintainability. Below are various scenarios showcasing how to use this library effectively across both synchronous and asynchronous code paths.
|
|
|
|
### Getting Started
|
|
|
|
First, import `@push.rocks/smartexpect` into your TypeScript file:
|
|
|
|
```typescript
|
|
import { expect, expectAsync } from '@push.rocks/smartexpect';
|
|
```
|
|
|
|
### Synchronous Expectations
|
|
|
|
You can employ `expect` to create synchronous assertions:
|
|
|
|
```typescript
|
|
import { expect } from '@push.rocks/smartexpect';
|
|
|
|
// String type assertion
|
|
expect('hello').toBeTypeofString();
|
|
|
|
// Negated String type assertion
|
|
expect(1).not.toBeTypeofString();
|
|
|
|
// Boolean type assertion
|
|
expect(true).toBeTypeofBoolean();
|
|
|
|
// Equality assertion
|
|
expect('hithere').toEqual('hithere');
|
|
|
|
// Deep equality assertion
|
|
expect({ key: 'value' }).toEqual({ key: 'value' });
|
|
|
|
// Regular expression matching
|
|
expect('hithere').toMatch(/hi/);
|
|
```
|
|
|
|
### Asynchronous Expectations
|
|
|
|
For asynchronous operations, use `expectAsync` to return a promise:
|
|
|
|
```typescript
|
|
import { expectAsync } from '@push.rocks/smartexpect';
|
|
|
|
const asyncStringFetcher = async (): Promise<string> => {
|
|
return 'async string';
|
|
};
|
|
|
|
const asyncTest = async () => {
|
|
await expectAsync(asyncStringFetcher()).toBeTypeofString();
|
|
await expectAsync(asyncStringFetcher()).toEqual('async string');
|
|
};
|
|
|
|
asyncTest();
|
|
```
|
|
|
|
### Advanced Usage
|
|
|
|
- **Properties and Deep Properties:** Assert the existence of properties and their values.
|
|
|
|
```typescript
|
|
const testObject = { level1: { level2: 'value' } };
|
|
|
|
// Property existence
|
|
expect(testObject).toHaveProperty('level1');
|
|
|
|
// Deep Property existence
|
|
expect(testObject).toHaveDeepProperty(['level1', 'level2']);
|
|
```
|
|
|
|
- **Conditions and Comparisons:** Allow more intricate assertions like greater than, less than, or matching specific conditions.
|
|
|
|
```typescript
|
|
// Greater Than
|
|
expect(5).toBeGreaterThan(3);
|
|
|
|
// Less Than
|
|
expect(3).toBeLessThan(5);
|
|
|
|
// Custom conditions
|
|
expect(7).customAssertion(value => value > 5, 'Value is not greater than 5');
|
|
```
|
|
|
|
- **Arrays and Objects:** Work seamlessly with arrays and objects, checking for containment, length, or specific values.
|
|
|
|
```typescript
|
|
const testArray = [1, 2, 3];
|
|
|
|
// Containment
|
|
expect(testArray).toContain(2);
|
|
|
|
// Array length
|
|
expect(testArray).toHaveLength(3);
|
|
|
|
// Object matching
|
|
expect({ name: 'Test', value: 123 }).toMatchObject({ name: 'Test' });
|
|
```
|
|
|
|
### Handling Promises and Async Operations
|
|
|
|
`@push.rocks/smartexpect` gracefully integrates with asynchronous operations, providing a `expectAsync` function that handles promise-based assertions. This keeps your tests clean and readable, irrespective of the nature of the code being tested.
|
|
|
|
### Best Practices
|
|
|
|
- **Readability:** Favor clarity and readability by explicitly stating your expectations. `@push.rocks/smartexpect`'s API is designed to be fluent and expressive, making your tests easy to write and, more importantly, easy to read.
|
|
|
|
- **Comprehensive Coverage:** Utilize the full spectrum of assertions provided to cover a broad set of use cases, ensuring your code behaves as expected not just in ideal conditions but across various edge cases.
|
|
|
|
- **Maintainability:** Group related assertions together to improve test maintainability. This makes it easier to update tests as your codebase evolves.
|
|
|
|
Through judicious use of `@push.rocks/smartexpect`, you can enhance the reliability and maintainability of your test suite, making your codebase more robust and your development workflow more efficient.
|
|
|
|
## License and Legal Information
|
|
|
|
This repository contains open-source code that is licensed under the MIT License. A copy of the MIT License can be found in the [license](license) file within this repository.
|
|
|
|
**Please note:** The MIT License does not grant permission to use the trade names, trademarks, service marks, or product names of the project, except as required for reasonable and customary use in describing the origin of the work and reproducing the content of the NOTICE file.
|
|
|
|
### Trademarks
|
|
|
|
This project is owned and maintained by Task Venture Capital GmbH. The names and logos associated with Task Venture Capital GmbH and any related products or services are trademarks of Task Venture Capital GmbH and are not included within the scope of the MIT license granted herein. Use of these trademarks must comply with Task Venture Capital GmbH's Trademark Guidelines, and any usage must be approved in writing by Task Venture Capital GmbH.
|
|
|
|
### Company Information
|
|
|
|
Task Venture Capital GmbH
|
|
Registered at District court Bremen HRB 35230 HB, Germany
|
|
|
|
For any legal inquiries or if you require further information, please contact us via email at hello@task.vc.
|
|
|
|
By using this repository, you acknowledge that you have read this section, agree to comply with its terms, and understand that the licensing of the code does not imply endorsement by Task Venture Capital GmbH of any derivative works.
|