svelte/test/runtime/samples/transition-js-each-block-intro-outro/_config.js

export default {
	data: {
		visible: false,
		things: [ 'a', 'b', 'c' ]
	},

	test ( assert, component, target, window, raf ) {
		component.set({ visible: true });
		const divs = target.querySelectorAll( 'div' );
		assert.equal( divs[0].foo, 0 );
		assert.equal( divs[1].foo, 0 );
		assert.equal( divs[2].foo, 0 );

		raf.tick( 50 );
		assert.equal( divs[0].foo, 0.5 );
		assert.equal( divs[1].foo, 0.5 );
		assert.equal( divs[2].foo, 0.5 );

		component.set({ visible: false });

		raf.tick( 70 );
		assert.equal( divs[0].foo, 0.7 );
		assert.equal( divs[1].foo, 0.7 );
		assert.equal( divs[2].foo, 0.7 );

		assert.equal( divs[0].bar, 0.8 );
		assert.equal( divs[1].bar, 0.8 );
		assert.equal( divs[2].bar, 0.8 );

		component.set({ visible: true });

		raf.tick( 100 );
		assert.equal( divs[0].foo, 0.3 );
		assert.equal( divs[1].foo, 0.3 );
		assert.equal( divs[2].foo, 0.3 );

		assert.equal( divs[0].bar, 1 );
		assert.equal( divs[1].bar, 1 );
		assert.equal( divs[2].bar, 1 );

		component.destroy();
	}
};