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json_stringify_stream_test.ts
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json_stringify_stream_test.ts
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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { assertEquals, assertRejects } from "../testing/asserts.ts";
import { readableStreamFromIterable } from "../streams/readable_stream_from_iterable.ts";
import {
JsonStringifyStream,
StringifyStreamOptions,
} from "./json_stringify_stream.ts";
async function assertValidStringify(
transformer: typeof JsonStringifyStream,
chunks: unknown[],
expect: string[],
options?: StringifyStreamOptions,
) {
const r = readableStreamFromIterable(chunks);
const res = [];
for await (const data of r.pipeThrough(new transformer(options))) {
res.push(data);
}
assertEquals(res, expect);
}
async function assertInvalidStringify(
transformer: typeof JsonStringifyStream,
chunks: unknown[],
options: StringifyStreamOptions,
// deno-lint-ignore no-explicit-any
ErrorClass: new (...args: any[]) => Error,
msgIncludes: string | undefined,
) {
const r = readableStreamFromIterable(chunks);
await assertRejects(
async () => {
for await (const _ of r.pipeThrough(new transformer(options)));
},
ErrorClass,
msgIncludes,
);
}
Deno.test({
name: "[json] JsonStringifyStream",
async fn() {
await assertValidStringify(
JsonStringifyStream,
[{ foo: "bar" }, { foo: "bar" }],
['{"foo":"bar"}\n', '{"foo":"bar"}\n'],
);
},
});
Deno.test({
name: "[json] JsonStringifyStream: throws",
async fn() {
const cyclic: Record<string, unknown> = {};
cyclic.cyclic = cyclic;
await assertInvalidStringify(
JsonStringifyStream,
[cyclic],
{},
TypeError,
"Converting circular structure to JSON",
);
},
});
Deno.test({
name: "[json] JsonStringifyStream: prefix and suffix",
async fn() {
await assertValidStringify(
JsonStringifyStream,
[{ foo: "bar" }, { foo: "bar" }],
[
'[[prefix]]{"foo":"bar"}[[suffix]]',
'[[prefix]]{"foo":"bar"}[[suffix]]',
],
{ prefix: "[[prefix]]", suffix: "[[suffix]]" },
);
},
});