Add xeval (denoland/deno_std#581)

Co-authored-by: Nayeem Rahman <muhammed.9939@gmail.com>


Original: https://github.com/denoland/deno_std/commit/a2cae360e8b68c93ef52d6baba5ee63a4b6609f0

1 files changed, 49 insertions, 0 deletions

diff --git a/xeval/test.ts b/xeval/test.ts
new file mode 100644
index 000000000..6b3e64ff4
--- /dev/null
+++ b/xeval/test.ts
@@ -0,0 +1,49 @@
+import { xeval } from "./mod.ts";
+import { stringsReader } from "../io/util.ts";
+import { decode, encode } from "../strings/mod.ts";
+import { assertEquals, assertStrContains } from "../testing/asserts.ts";
+import { test } from "../testing/mod.ts";
+const { execPath, run } = Deno;
+
+test(async function xevalSuccess(): Promise<void> {
+  const chunks: string[] = [];
+  await xeval(stringsReader("a\nb\nc"), ($): number => chunks.push($));
+  assertEquals(chunks, ["a", "b", "c"]);
+});
+
+test(async function xevalDelimiter(): Promise<void> {
+  const chunks: string[] = [];
+  await xeval(stringsReader("!MADMADAMADAM!"), ($): number => chunks.push($), {
+    delimiter: "MADAM"
+  });
+  assertEquals(chunks, ["!MAD", "ADAM!"]);
+});
+
+// https://github.com/denoland/deno/issues/2861
+// TODO: Use the URL constructor here when it's fixed.
+const modTsUrl = import.meta.url.replace(/test.ts$/, "mod.ts");
+
+test(async function xevalCliReplvar(): Promise<void> {
+  const p = run({
+    args: [execPath(), modTsUrl, "--replvar=abc", "console.log(abc)"],
+    stdin: "piped",
+    stdout: "piped",
+    stderr: "null"
+  });
+  await p.stdin!.write(encode("hello"));
+  await p.stdin!.close();
+  assertEquals(await p.status(), { code: 0, success: true });
+  assertEquals(decode(await p.output()), "hello\n");
+});
+
+test(async function xevalCliSyntaxError(): Promise<void> {
+  const p = run({
+    args: [execPath(), modTsUrl, "("],
+    stdin: "null",
+    stdout: "piped",
+    stderr: "piped"
+  });
+  assertEquals(await p.status(), { code: 1, success: false });
+  assertEquals(decode(await p.output()), "");
+  assertStrContains(decode(await p.stderrOutput()), "Uncaught SyntaxError");
+});