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import { describe, it, expect, beforeAll } from "bun:test";
import { spawn, execSync } from "node:child_process";
const CHILD_PROCESS_FILE = import.meta.dir + "/spawned-child.js";
const OUT_FILE = import.meta.dir + "/stdio-test-out.txt";
// describe("process.stdout", () => {
// // it("should allow us to write to it", () => {
// // process.stdout.write("Bun is cool\n");
// // });
// // it("should allow us to use a file as stdout", () => {
// // const output = "Bun is cool\n";
// // execSync(`rm -f ${OUT_FILE}`);
// // const result = execSync(`bun ${CHILD_PROCESS_FILE} STDOUT > ${OUT_FILE}`, {
// // encoding: "utf8",
// // stdin,
// // });
// // expect(result).toBe(output);
// // expect(readSync(OUT_FILE)).toBe(output);
// // });
// });
describe("process.stdin", () => {
it("should allow us to read from stdin in readable mode", (done) => {
// Child should read from stdin and write it back
const child = spawn("bun", [CHILD_PROCESS_FILE, "STDIN", "READABLE"]);
child.stdout.setEncoding("utf8");
child.stdout.on("data", (data) => {
expect(data.trim()).toBe("data: hello");
done();
});
child.stdin.write("hello\n");
child.stdin.end();
});
it("should allow us to read from stdin via flowing mode", (done) => {
// Child should read from stdin and write it back
const child = spawn("bun", [CHILD_PROCESS_FILE, "STDIN", "FLOWING"]);
child.stdout.setEncoding("utf8");
child.stdout.on("data", (data) => {
expect(data.trim()).toBe("data: hello");
done();
});
child.stdin.write("hello\n");
child.stdin.end();
});
it("should allow us to read > 65kb from stdin", (done) => {
// Child should read from stdin and write it back
const child = spawn("bun", [CHILD_PROCESS_FILE, "STDIN", "FLOWING"]);
child.stdout.setEncoding("utf8");
const numReps = Math.ceil((66 * 1024) / 5);
const input = "hello".repeat(numReps);
let data = "";
child.stdout.on("end", () => {
expect(data).toBe(`data: ${input}`);
done();
});
child.stdout.on("readable", () => {
let chunk;
while ((chunk = child.stdout.read()) !== null) {
data += chunk.trim();
}
});
child.stdin.write(input);
child.stdin.end();
});
it("should allow us to read from a file", () => {
const result = execSync(
`bun ${CHILD_PROCESS_FILE} STDIN FLOWING < ${
import.meta.dir
}/readFileSync.txt`,
{ encoding: "utf8" },
);
expect(result.trim()).toEqual("File read successfully");
});
});
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