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import { describe, expect, it } from "vitest";
import { buildResult, createIOCallbacks, preprocessCode } from "./lib.mjs";
describe("preprocessCode", () => {
it("removes <?php tag and prepends PRELUDE", () => {
const result = preprocessCode('<?php echo "hello";');
expect(result).toContain('echo "hello";');
expect(result).toContain("error_reporting");
expect(result).not.toContain("<?php");
});
it("removes <? short tag and prepends PRELUDE", () => {
const result = preprocessCode('<? echo "hello";');
expect(result).toContain('echo "hello";');
expect(result).toContain("error_reporting");
expect(result).not.toContain("<?");
});
it("prepends PRELUDE when no php tag present", () => {
const result = preprocessCode('echo "hello";');
expect(result).toContain('echo "hello";');
expect(result).toContain("error_reporting");
});
it("handles empty string", () => {
const result = preprocessCode("");
expect(result).toContain("error_reporting");
});
it("does not remove <?php when not at the start", () => {
const result = preprocessCode('echo "x"; <?php echo "y";');
expect(result).toContain("<?php");
});
});
describe("createIOCallbacks", () => {
describe("stdin", () => {
it("reads input byte by byte", () => {
const io = createIOCallbacks("AB");
expect(io.stdin()).toBe(65); // 'A'
expect(io.stdin()).toBe(66); // 'B'
});
it("returns null at EOF", () => {
const io = createIOCallbacks("A");
io.stdin(); // consume 'A'
expect(io.stdin()).toBeNull();
expect(io.stdin()).toBeNull();
});
it("returns null immediately for empty input", () => {
const io = createIOCallbacks("");
expect(io.stdin()).toBeNull();
});
});
describe("stdout", () => {
it("captures ASCII writes", () => {
const io = createIOCallbacks("");
io.stdout(72); // 'H'
io.stdout(105); // 'i'
expect(io.getStdout()).toBe("Hi");
});
it("ignores null (flush)", () => {
const io = createIOCallbacks("");
io.stdout(65);
io.stdout(null);
io.stdout(66);
expect(io.getStdout()).toBe("AB");
});
it("corrects negative asciiCode by adding 256", () => {
const io = createIOCallbacks("");
// -191 + 256 = 65 = 'A'
io.stdout(-191);
expect(io.getStdout()).toBe("A");
});
it("truncates output at 10KB buffer limit", () => {
const io = createIOCallbacks("");
const limit = 10 * 1024;
for (let i = 0; i < limit + 100; i++) {
io.stdout(65);
}
expect(io.getStdout().length).toBe(limit);
});
});
describe("stderr", () => {
it("captures ASCII writes", () => {
const io = createIOCallbacks("");
io.stderr(69); // 'E'
io.stderr(114); // 'r'
expect(io.getStderr()).toBe("Er");
});
it("ignores null (flush)", () => {
const io = createIOCallbacks("");
io.stderr(65);
io.stderr(null);
expect(io.getStderr()).toBe("A");
});
it("corrects negative asciiCode by adding 256", () => {
const io = createIOCallbacks("");
// -156 + 256 = 100 = 'd'
io.stderr(-156);
expect(io.getStderr()).toBe("d");
});
it("truncates output at 10KB buffer limit", () => {
const io = createIOCallbacks("");
const limit = 10 * 1024;
for (let i = 0; i < limit + 100; i++) {
io.stderr(65);
}
expect(io.getStderr().length).toBe(limit);
});
});
});
describe("buildResult", () => {
it("returns success when err is null and result is 0", () => {
const result = buildResult(
null,
0,
() => "out",
() => "",
);
expect(result).toEqual({
status: "success",
stdout: "out",
stderr: "",
});
});
it("returns runtime_error when result is non-zero", () => {
const result = buildResult(
null,
1,
() => "out",
() => "err",
);
expect(result).toEqual({
status: "runtime_error",
stdout: "out",
stderr: "err",
});
});
it("returns runtime_error with concatenated stderr when err is thrown", () => {
const err = new Error("fatal");
const result = buildResult(
err,
undefined,
() => "out",
() => "err",
);
expect(result.status).toBe("runtime_error");
expect(result.stdout).toBe("out");
expect(result.stderr).toContain("err");
expect(result.stderr).toContain("Error: fatal");
});
});
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