deno/std/node/process_test.ts

const { test } = Deno;
import { assert, assertThrows, assertEquals } from "../testing/asserts.ts";
import { process } from "./process.ts";

// NOTE: Deno.execPath() (and thus process.argv) currently requires --allow-env
// (Also Deno.env.toObject() (and process.env) requires --allow-env but it's more obvious)

test({
  name: "process.cwd and process.chdir success",
  fn() {
    // this should be run like other tests from directory up
    assert(process.cwd().match(/\Wstd$/));
    process.chdir("node");
    assert(process.cwd().match(/\Wnode$/));
    process.chdir("..");
    assert(process.cwd().match(/\Wstd$/));
  },
});

test({
  name: "process.chdir failure",
  fn() {
    assertThrows(
      () => {
        process.chdir("non-existent-directory-name");
      },
      Deno.errors.NotFound,
      "file"
      // On every OS Deno returns: "No such file" except for Windows, where it's:
      // "The system cannot find the file specified. (os error 2)" so "file" is
      // the only common string here.
    );
  },
});

test({
  name: "process.version",
  fn() {
    assertEquals(typeof process, "object");
    assertEquals(typeof process.version, "string");
    assertEquals(typeof process.versions, "object");
    assertEquals(typeof process.versions.node, "string");
  },
});

test({
  name: "process.platform",
  fn() {
    assertEquals(typeof process.platform, "string");
  },
});

test({
  name: "process.arch",
  fn() {
    assertEquals(typeof process.arch, "string");
    // TODO(rsp): make sure that the arch strings should be the same in Node and Deno:
    assertEquals(process.arch, Deno.build.arch);
  },
});

test({
  name: "process.pid",
  fn() {
    assertEquals(typeof process.pid, "number");
    assertEquals(process.pid, Deno.pid);
  },
});

test({
  name: "process.on",
  fn() {
    assertEquals(typeof process.on, "function");
    assertThrows(
      () => {
        process.on("uncaughtException", (_err: Error) => {});
      },
      Error,
      "implemented"
    );
  },
});

test({
  name: "process.argv",
  fn() {
    assert(Array.isArray(process.argv));
    assert(
      process.argv[0].match(/[^/\\]*deno[^/\\]*$/),
      "deno included in the file name of argv[0]"
    );
    // we cannot test for anything else (we see test runner arguments here)
  },
});

test({
  name: "process.env",
  fn() {
    assertEquals(typeof process.env.PATH, "string");
  },
});