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default.test() — svelte Function Reference

Architecture documentation for the default.test() function in _config.js from the svelte codebase.

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Dependency Diagram

graph TD
  cea83b31_f0c9_b903_e65c_7ea70ccea12b["default.test()"]
  4aa74f61_1f8c_d893_5e2b_db31b5296b8b["_config.js"]
  cea83b31_f0c9_b903_e65c_7ea70ccea12b -->|defined in| 4aa74f61_1f8c_d893_5e2b_db31b5296b8b
  style cea83b31_f0c9_b903_e65c_7ea70ccea12b fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

packages/svelte/tests/runtime-legacy/samples/transition-js-each-block-keyed-intro-outro/_config.js lines 12–58

	test({ assert, component, target, raf }) {
		const divs = /** @type {NodeListOf<HTMLDivElement & { foo: number, i: number }>} */ (
			target.querySelectorAll('div')
		);
		divs[0].i = 0; // for debugging
		divs[1].i = 1;
		divs[2].i = 2;

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

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

		component.things = [{ name: 'a' }, { name: 'c' }];

		const divs2 = target.querySelectorAll('div');
		assert.strictEqual(divs[0], divs2[0]);
		assert.strictEqual(divs[1], divs2[1]);
		assert.strictEqual(divs[2], divs2[2]);

		raf.tick(150);
		assert.equal(divs[0].foo, 1);
		assert.equal(divs[1].foo, 0.5);
		assert.equal(divs[2].foo, 1);

		component.things = [{ name: 'a' }, { name: 'b' }, { name: 'c' }];

		raf.tick(175);
		assert.equal(divs[0].foo, 1);
		assert.equal(divs[1].foo, 0.75);
		assert.equal(divs[2].foo, 1);

		raf.tick(225);
		const divs3 = target.querySelectorAll('div');
		assert.strictEqual(divs[0], divs3[0]);
		assert.strictEqual(divs[1], divs3[1]);
		assert.strictEqual(divs[2], divs3[2]);

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

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Frequently Asked Questions

What does default.test() do?
default.test() is a function in the svelte codebase, defined in packages/svelte/tests/runtime-legacy/samples/transition-js-each-block-keyed-intro-outro/_config.js.
Where is default.test() defined?
default.test() is defined in packages/svelte/tests/runtime-legacy/samples/transition-js-each-block-keyed-intro-outro/_config.js at line 12.

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