_tape.mjs

import { postcssTape, ruleClonerPlugin } from '@csstools/postcss-tape';
import plugin from 'postcss-image-set-function';

postcssTape(plugin)({
	'basic': {
		message: 'supports basic usage',
	},
	'basic:no-preserve': {
		message: 'supports { preserve: false } usage',
		options: {
			preserve: false,
		},
	},
	'basic:with-cloned-rules': {
		message: 'doesn\'t cause duplicate CSS',
		plugins: [
			ruleClonerPlugin,
			plugin({
				preserve: true,
			}),
		],
	},
	'invalid': {
		message: 'ignores invalid usage',
		expect: 'invalid.css',
		result: 'invalid.css',
	},
	'invalid:warn': {
		message: 'warns invalid usage when { onvalid: "warn" }',
		options: {
			onInvalid: 'warn',
		},
		expect: 'invalid.css',
		result: 'invalid.css',
		warnings: 9,
	},
	'invalid:throw': {
		message: 'throws invalid usage when { onvalid: "throw" }',
		options: {
			onInvalid: 'throw',
		},
		expect: 'invalid.css',
		result: 'invalid.css',
		exception: /unexpected image/,
	},
	'generated-value-cases': {
		message: 'correctly handles generated cases',
		options: {
			preserve: false,
		},
	},
	'generated-value-cases:preserve': {
		message: 'correctly handles generated cases',
		options: {
			preserve: true,
		},
	},
});