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denoland-deno/js/read_file_test.ts

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// Copyright 2018 the Deno authors. All rights reserved. MIT license.
import { test, assert, assertEqual } from "./test_util.ts";
import * as deno from "deno";
test(function readFileSyncSuccess() {
const data = deno.readFileSync("package.json");
assert(data.byteLength > 0);
const decoder = new TextDecoder("utf-8");
const json = decoder.decode(data);
const pkg = JSON.parse(json);
assertEqual(pkg.name, "deno");
});
test(function readFileSyncNotFound() {
let caughtError = false;
let data;
try {
data = deno.readFileSync("bad_filename");
} catch (e) {
caughtError = true;
assertEqual(e.kind, deno.ErrorKind.NotFound);
}
assert(caughtError);
assert(data === undefined);
});
test(async function readFileSuccess() {
const data = await deno.readFile("package.json");
assert(data.byteLength > 0);
const decoder = new TextDecoder("utf-8");
const json = decoder.decode(data);
const pkg = JSON.parse(json);
assertEqual(pkg.name, "deno");
});