### Install stylelint-test-rule-node

Source: https://github.com/stylelint/stylelint-test-rule-node/blob/main/README.md

Installs the stylelint-test-rule-node package and stylelint as development dependencies. This is the first step to using the rule tester.

```shell
npm install stylelint-test-rule-node stylelint --save-dev
```

--------------------------------

### Test a Stylelint plugin with testRule and autofix

Source: https://github.com/stylelint/stylelint-test-rule-node/blob/main/README.md

Shows how to test a custom Stylelint plugin using `testRule`. This example includes passing the plugin, rule name, configuration, enabling autofix (`fix: true`), and defining `accept` and `reject` cases with expected autofixed output and detailed warning information.

```javascript
// my-plugin.test.js
import { testRule } from "stylelint-test-rule-node";

import myPlugin from "./my-plugin.js";

const plugins = [myPlugin];
const { ruleName, rule: { messages } } = myPlugin;

testRule({
  plugins,
  ruleName,
  config: [true, { type: "kebab" }],
  fix: true,

  accept: [
    {
      code: ".class {}",
      description: "simple class selector"
    },
    {
      code: ".my-class {}",
      description: "kebab class selector"
    }
  ],

  reject: [
    {
      code: ".myClass {}",
      fixed: ".my-class {}",
      description: "camel case class selector",
      message: messages.expected(),
      line: 1,
      column: 1,
      endLine: 1,
      endColumn: 8
    },
    {
      code: ".MyClass,\n.MyOtherClass {}",
      fixed: ".my-class,\n.my-other-class {}",
      description: "two pascal class selectors in a selector list",
      warnings: [
        {
          message: messages.expected(),
          line: 1,
          column: 1,
          endLine: 1,
          endColumn: 8
        },
        {
          message: messages.expected(),
          line: 2,
          column: 1,
          endLine: 2,
          endColumn: 13
        }
      ]
    }
  ]
});
```

--------------------------------

### Test a Stylelint rule with testRule

Source: https://github.com/stylelint/stylelint-test-rule-node/blob/main/README.md

Demonstrates how to use the `testRule` function to test a Stylelint rule. It includes configurations for `ruleName`, `config`, and arrays of `accept` and `reject` test cases, specifying expected code, messages, and autofix results.

```javascript
// block-no-empty.test.js
import { testRule } from "stylelint-test-rule-node";

testRule({
  ruleName: "block-no-empty",
  config: true,

  accept: [
    {
      code: "a { color: red }"
    }
  ],

  reject: [
    {
      code: "a {}",
      message: "Unexpected empty block (block-no-empty)"
    }
  ]
});
```

--------------------------------

### Test invalid Stylelint rule configurations

Source: https://github.com/stylelint/stylelint-test-rule-node/blob/main/README.md

Illustrates the use of `testRuleConfigs` to verify that a Stylelint rule correctly rejects invalid configuration options. It defines `accept` and `reject` cases with different `config` values, including strings and regular expressions.

```javascript
import { testRuleConfigs } from "stylelint-test-rule-node";

testRuleConfigs({
  plugins,
  ruleName,

  accept: [
    {
      config: "valid"
    }
  ],

  reject: [
    {
      config: "invalid"
    },
    {
      config: [/invalid/],
      description: "regex is not allowed"
    }
  ]
});
```

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