out-of-your-element/d2m/converters/lottie.test.js

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2024-01-18 03:54:09 +00:00
// @ts-check
const fs = require("fs")
const stream = require("stream")
const {test} = require("supertape")
const {convert} = require("./lottie")
const WRITE_PNG = false
test("lottie: can convert and save PNG", async t => {
const input = await fs.promises.readFile("test/res/lottie-bee.json", "utf8")
const resultStream = await convert(input)
/* c8 ignore next 3 */
if (WRITE_PNG) {
resultStream.pipe(fs.createWriteStream("test/res/lottie-bee.png"))
t.fail("PNG written to /test/res/lottie-bee.png, please manually check it")
} else {
const expected = await fs.promises.readFile("test/res/lottie-bee.png")
const actual = Buffer.alloc(expected.length)
let i = 0
await stream.promises.pipeline(
resultStream,
async function* (source) {
for await (const chunk of source) {
chunk.copy(actual, i)
i += chunk.length
}
},
new stream.PassThrough()
)
t.equal(i, actual.length, `allocated ${actual.length} bytes, but wrote ${i}`)
t.deepEqual(actual, expected)
}
})