denoland-deno/cli/tests/repl_tests.rs

// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.

use test_util as util;
use test_util::assert_contains;
use test_util::assert_ends_with;
use test_util::assert_not_contains;

mod repl {
  use super::*;

  #[test]
  fn pty_multiline() {
    util::with_pty(&["repl"], |mut console| {
      console.write_line("(\n1 + 2\n)");
      console.write_line("{\nfoo: \"foo\"\n}");
      console.write_line("`\nfoo\n`");
      console.write_line("`\n\\`\n`");
      console.write_line("'{'");
      console.write_line("'('");
      console.write_line("'['");
      console.write_line("/{/");
      console.write_line("/\\(/");
      console.write_line("/\\[/");
      console.write_line("console.log(\"{test1} abc {test2} def {{test3}}\".match(/{([^{].+?)}/));");
      console.write_line("close();");

      let output = console.read_all_output();
      assert_contains!(output, '3');
      assert_contains!(output, "{ foo: \"foo\" }");
      assert_contains!(output, "\"\\nfoo\\n\"");
      assert_contains!(output, "\"\\n`\\n\"");
      assert_contains!(output, "\"{\"");
      assert_contains!(output, "\"(\"");
      assert_contains!(output, "\"[\"");
      assert_contains!(output, "/{/");
      assert_contains!(output, "/\\(/");
      assert_contains!(output, "/\\[/");
      assert_contains!(output, "[ \"{test1}\", \"test1\" ]");
    });
  }

  #[test]
  fn pty_null() {
    util::with_pty(&["repl"], |mut console| {
      console.write_line("null");
      console.write_line("close();");

      let output = console.read_all_output();
      assert_contains!(output, "null");
    });
  }

  #[test]
  fn pty_unpaired_braces() {
    util::with_pty(&["repl"], |mut console| {
      console.write_line(")");
      console.write_line("]");
      console.write_line("}");
      console.write_line("close();");

      let output = console.read_all_output();
      assert_contains!(output, "Unexpected token `)`");
      assert_contains!(output, "Unexpected token `]`");
      assert_contains!(output, "Unexpected token `}`");
    });
  }

  #[test]
  fn pty_bad_input() {
    util::with_pty(&["repl"], |mut console| {
      console.write_line("'\\u{1f3b5}'[0]");
      console.write_line("close();");

      let output = console.read_all_output();
      assert_contains!(output, "Unterminated string literal");
    });
  }

  #[test]
  fn pty_syntax_error_input() {
    util::with_pty(&["repl"], |mut console| {
      console.write_line("('\\u')");
      console.write_line("'");
      console.write_line("[{'a'}];");
      console.write_line("close();");

      let output = console.read_all_output();
      assert_contains!(
        output,
        "Bad character escape sequence, expected 4 hex characters"
      );
      assert_contains!(output, "Unterminated string constant");
      assert_contains!(output, "Expected a semicolon");
    });
  }

  #[test]
  fn pty_complete_symbol() {
    util::with_pty(&["repl"], |mut console| {
      console.write_line("Symbol.it\t");
      console.write_line("close();");

      let output = console.read_all_output();
      assert_contains!(output, "Symbol(Symbol.iterator)");
    });
  }

  #[test]
  fn pty_complete_declarations() {
    util::with_pty(&["repl"], |mut console| {
      console.write_line("class MyClass {}");
      console.write_line("My\t");
      console.write_line("let myVar;");
      console.write_line("myV\t");
      console.write_line("close();");

      let output = console.read_all_output();
      assert_contains!(output, "> MyClass");
      assert_contains!(output, "> myVar");
    });
  }

  #[test]
  fn pty_complete_primitives() {
    util::with_pty(&["repl"], |mut console| {
      console.write_line("let func = function test(){}");
      console.write_line("func.appl\t");
      console.write_line("let str = ''");
      console.write_line("str.leng\t");
      console.write_line("false.valueO\t");
      console.write_line("5n.valueO\t");
      console.write_line("let num = 5");
      console.write_line("num.toStrin\t");
      console.write_line("close();");

      let output = console.read_all_output();
      assert_contains!(output, "> func.apply");
      assert_contains!(output, "> str.length");
      assert_contains!(output, "> 5n.valueOf");
      assert_contains!(output, "> false.valueOf");
      assert_contains!(output, "> num.toString");
    });
  }

  #[test]
  fn pty_complete_expression() {
    util::with_pty(&["repl"], |mut console| {
      console.write_text("Deno.\t\t");
      console.write_text("y");
      console.write_line("");
      console.write_line("close();");
      let output = console.read_all_output();
      assert_contains!(output, "Display all");
      assert_contains!(output, "core");
      assert_contains!(output, "args");
      assert_contains!(output, "exit");
      assert_contains!(output, "symlink");
      assert_contains!(output, "permissions");
    });
  }

  #[test]
  fn pty_complete_imports() {
    util::with_pty(&["repl"], |mut console| {
      // single quotes
      console.write_line("import './run/001_hel\t'");
      // double quotes
      console.write_line("import { output } from \"./run/045_out\t\"");
      console.write_line("output('testing output');");
      console.write_line("close();");

      let output = console.read_all_output();
      assert_contains!(output, "Hello World");
      assert_contains!(
        output,
        // on windows, could contain either (it's flaky)
        "\ntesting output",
        "testing output\u{1b}",
      );
    });

    // ensure when the directory changes that the suggestions come from the cwd
    util::with_pty(&["repl"], |mut console| {
      console.write_line("Deno.chdir('./subdir');");
      console.write_line("import '../run/001_hel\t'");
      console.write_line("close();");

      let output = console.read_all_output();
      assert_contains!(output, "Hello World");
    });
  }

  #[test]
  fn pty_complete_imports_no_panic_empty_specifier() {
    // does not panic when tabbing when empty
    util::with_pty(&["repl"], |mut console| {
      console.write_line("import '\t';");
      console.write_line("close();");
    });
  }

  #[test]
  fn pty_ignore_symbols() {
    util::with_pty(&["repl"], |mut console| {
      console.write_line("Array.Symbol\t");
      console.write_line("close();");

      let output = console.read_all_output();
      assert_contains!(output, "undefined");
      assert_not_contains!(
        output,
        "Uncaught TypeError: Array.Symbol is not a function"
      );
    });
  }

  #[test]
  fn pty_assign_global_this() {
    util::with_pty(&["repl"], |mut console| {
      console.write_line("globalThis = 42;");
      console.write_line("close();");

      let output = console.read_all_output();
      assert_not_contains!(output, "panicked");
    });
  }

  #[test]
  fn pty_emoji() {
    // windows was having issues displaying this
    util::with_pty(&["repl"], |mut console| {
      console.write_line(r#"console.log('\u{1F995}');"#);
      console.write_line("close();");

      let output = console.read_all_output();
      // only one for the output (since input is escaped)
      let emoji_count = output.chars().filter(|c| *c == '🦕').count();
      assert_eq!(emoji_count, 1);
    });
  }

  #[test]
  fn console_log() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["console.log('hello')", "'world'"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "hello\nundefined\n\"world\"\n");
    assert!(err.is_empty());
  }

  #[test]
  fn object_literal() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["{}", "{ foo: 'bar' }"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "{}\n{ foo: \"bar\" }\n");
    assert!(err.is_empty());
  }

  #[test]
  fn block_expression() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["{};", "{\"\"}"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "undefined\n\"\"\n");
    assert!(err.is_empty());
  }

  #[test]
  fn await_resolve() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["await Promise.resolve('done')"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "\"done\"\n");
    assert!(err.is_empty());
  }

  #[test]
  fn await_timeout() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["await new Promise((r) => setTimeout(r, 0, 'done'))"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "\"done\"\n");
    assert!(err.is_empty());
  }

  #[test]
  fn let_redeclaration() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["let foo = 0;", "foo", "let foo = 1;", "foo"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "undefined\n0\nundefined\n1\n");
    assert!(err.is_empty());
  }

  #[test]
  fn repl_cwd() {
    let (_out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["Deno.cwd()"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert!(err.is_empty());
  }

  #[test]
  fn typescript() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec![
        "function add(a: number, b: number) { return a + b }",
        "const result: number = add(1, 2) as number;",
        "result",
      ]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "undefined\nundefined\n3\n");
    assert!(err.is_empty());
  }

  #[test]
  fn typescript_declarations() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec![
        "namespace Test { export enum Values { A, B, C } }",
        "Test.Values.A",
        "Test.Values.C",
        "interface MyInterface { prop: string; }",
        "type MyTypeAlias = string;",
      ]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    let expected_end_text = "undefined\n0\n2\nundefined\nundefined\n";
    assert_ends_with!(out, expected_end_text);
    assert!(err.is_empty());
  }

  #[test]
  fn typescript_decorators() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec![
        "function dec(target) { target.prototype.test = () => 2; }",
        "@dec class Test {}",
        "new Test().test()",
      ]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "undefined\n[Function: Test]\n2\n");
    assert!(err.is_empty());
  }

  #[test]
  fn eof() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["1 + 2"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "3\n");
    assert!(err.is_empty());
  }

  #[test]
  fn strict() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec![
        "let a = {};",
        "Object.preventExtensions(a);",
        "a.c = 1;",
      ]),
      None,
      false,
    );
    assert_contains!(
      out,
      "Uncaught TypeError: Cannot add property c, object is not extensible"
    );
    assert!(err.is_empty());
  }

  #[test]
  fn close_command() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["close()", "'ignored'"]),
      None,
      false,
    );

    assert_not_contains!(out, "ignored");
    assert!(err.is_empty());
  }

  #[test]
  fn function() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["Deno.writeFileSync"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "[Function: writeFileSync]\n");
    assert!(err.is_empty());
  }

  #[test]
  #[ignore]
  fn multiline() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["(\n1 + 2\n)"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "3\n");
    assert!(err.is_empty());
  }

  #[test]
  fn import() {
    let (out, _) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["import('./subdir/auto_print_hello.ts')"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_contains!(out, "hello!\n");
  }

  #[test]
  fn import_declarations() {
    let (out, _) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["import './subdir/auto_print_hello.ts';"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_contains!(out, "hello!\n");
  }

  #[test]
  fn exports_stripped() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["export default 5;", "export class Test {}"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_contains!(out, "5\n");
    assert!(err.is_empty());
  }

  #[test]
  fn call_eval_unterminated() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["eval('{')"]),
      None,
      false,
    );
    assert_contains!(out, "Unexpected end of input");
    assert!(err.is_empty());
  }

  #[test]
  fn unpaired_braces() {
    for right_brace in &[")", "]", "}"] {
      let (out, err) = util::run_and_collect_output(
        true,
        "repl",
        Some(vec![right_brace]),
        None,
        false,
      );
      assert_contains!(out, "Unexpected token");
      assert!(err.is_empty());
    }
  }

  #[test]
  fn reference_error() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["not_a_variable"]),
      None,
      false,
    );
    assert_contains!(out, "not_a_variable is not defined");
    assert!(err.is_empty());
  }

  #[test]
  fn syntax_error() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec![
        "syntax error",
        "2", // ensure it keeps accepting input after
      ]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(
      out,
      "parse error: Expected ';', '}' or <eof> at 1:8\n2\n"
    );
    assert!(err.is_empty());
  }

  #[test]
  fn syntax_error_jsx() {
    // JSX is not supported in the REPL
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["const element = <div />;"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_contains!(out, "Unexpected token `>`");
    assert!(err.is_empty());
  }

  #[test]
  fn type_error() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["console()"]),
      None,
      false,
    );
    assert_contains!(out, "console is not a function");
    assert!(err.is_empty());
  }

  #[test]
  fn variable() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["var a = 123;", "a"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "undefined\n123\n");
    assert!(err.is_empty());
  }

  #[test]
  fn lexical_scoped_variable() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["let a = 123;", "a"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "undefined\n123\n");
    assert!(err.is_empty());
  }

  #[test]
  fn missing_deno_dir() {
    use std::fs::{read_dir, remove_dir_all};
    const DENO_DIR: &str = "nonexistent";
    let test_deno_dir = test_util::testdata_path().join(DENO_DIR);
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["1"]),
      Some(vec![
        ("DENO_DIR".to_owned(), DENO_DIR.to_owned()),
        ("NO_COLOR".to_owned(), "1".to_owned()),
      ]),
      false,
    );
    assert!(read_dir(&test_deno_dir).is_ok());
    remove_dir_all(&test_deno_dir).unwrap();
    assert_ends_with!(out, "1\n");
    assert!(err.is_empty());
  }

  #[test]
  fn save_last_eval() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["1", "_"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "1\n1\n");
    assert!(err.is_empty());
  }

  #[test]
  fn save_last_thrown() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["throw 1", "_error"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(out, "Uncaught 1\n1\n");
    assert!(err.is_empty());
  }

  #[test]
  fn assign_underscore() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["_ = 1", "2", "_"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert_ends_with!(
      out,
      "Last evaluation result is no longer saved to _.\n1\n2\n1\n"
    );
    assert!(err.is_empty());
  }

  #[test]
  fn assign_underscore_error() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["_error = 1", "throw 2", "_error"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    println!("{}", out);
    assert_ends_with!(
      out,
      "Last thrown error is no longer saved to _error.\n1\nUncaught 2\n1\n"
    );
    assert!(err.is_empty());
  }

  #[test]
  fn custom_inspect() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec![
        r#"const o = {
        [Symbol.for("Deno.customInspect")]() {
          throw new Error('Oops custom inspect error');
        },
      };"#,
        "o",
      ]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );

    assert_contains!(out, "Oops custom inspect error");
    assert!(err.is_empty());
  }

  #[test]
  fn eval_flag_valid_input() {
    let (out, err) = util::run_and_collect_output_with_args(
      true,
      vec!["repl", "--eval", "const t = 10;"],
      Some(vec!["t * 500;"]),
      None,
      false,
    );
    assert_contains!(out, "5000");
    assert!(err.is_empty());
  }

  #[test]
  fn eval_flag_parse_error() {
    let (out, err) = util::run_and_collect_output_with_args(
      true,
      vec!["repl", "--eval", "const %"],
      Some(vec!["250 * 10"]),
      None,
      false,
    );
    assert_contains!(
      test_util::strip_ansi_codes(&out),
      "Error in --eval flag: parse error: Unexpected token `%`."
    );
    assert_contains!(out, "2500"); // should not prevent input
    assert!(err.is_empty());
  }

  #[test]
  fn eval_flag_runtime_error() {
    let (out, err) = util::run_and_collect_output_with_args(
      true,
      vec!["repl", "--eval", "throw new Error('Testing')"],
      Some(vec!["250 * 10"]),
      None,
      false,
    );
    assert_contains!(out, "Error in --eval flag: Uncaught Error: Testing");
    assert_contains!(out, "2500"); // should not prevent input
    assert!(err.is_empty());
  }

  #[test]
  fn eval_file_flag_valid_input() {
    let (out, err) = util::run_and_collect_output_with_args(
      true,
      vec!["repl", "--eval-file=./run/001_hello.js"],
      None,
      None,
      false,
    );
    assert_contains!(out, "Hello World");
    assert!(err.is_empty());
  }

  #[test]
  fn eval_file_flag_call_defined_function() {
    let (out, err) = util::run_and_collect_output_with_args(
      true,
      vec!["repl", "--eval-file=./tsc/d.ts"],
      Some(vec!["v4()"]),
      None,
      false,
    );
    assert_contains!(out, "hello");
    assert!(err.is_empty());
  }

  #[test]
  fn eval_file_flag_http_input() {
    let (out, err) = util::run_and_collect_output_with_args(
      true,
      vec!["repl", "--eval-file=http://127.0.0.1:4545/tsc/d.ts"],
      Some(vec!["v4()"]),
      None,
      true,
    );
    assert_contains!(out, "hello");
    assert!(err.contains("Download"));
  }

  #[test]
  fn eval_file_flag_multiple_files() {
    let (out, err) = util::run_and_collect_output_with_args(
    true,
    vec!["repl", "--eval-file=http://127.0.0.1:4545/repl/import_type.ts,./tsc/d.ts,http://127.0.0.1:4545/type_definitions/foo.js"],
    Some(vec!["b.method1=v4", "b.method1()+foo.toUpperCase()"]),
    None,
    true,
  );
    assert_contains!(out, "helloFOO");
    assert_contains!(err, "Download");
  }

  #[test]
  fn pty_clear_function() {
    util::with_pty(&["repl"], |mut console| {
      console.write_line("console.log('hello');");
      console.write_line("clear();");
      console.write_line("const clear = 1234 + 2000;");
      console.write_line("clear;");
      console.write_line("close();");

      let output = console.read_all_output();
      if cfg!(windows) {
        // Windows will overwrite what's in the console buffer before
        // we read from it. It contains this string repeated many times
        // to clear the screen.
        assert_contains!(output, "\r\n\u{1b}[K\r\n\u{1b}[K\r\n\u{1b}[K");
      } else {
        assert_contains!(output, "hello");
        assert_contains!(output, "[1;1H");
      }
      assert_contains!(output, "undefined");
      assert_contains!(output, "const clear = 1234 + 2000;");
      assert_contains!(output, "3234");
    });
  }

  #[test]
  fn pty_tab_handler() {
    // If the last character is **not** whitespace, we show the completions
    util::with_pty(&["repl"], |mut console| {
      console.write_line("a\t\t");
      console.write_line("close();");
      let output = console.read_all_output();
      assert_contains!(output, "addEventListener");
      assert_contains!(output, "alert");
      assert_contains!(output, "atob");
    });
    // If the last character is whitespace, we just insert a tab
    util::with_pty(&["repl"], |mut console| {
      console.write_line("a; \t\t"); // last character is whitespace
      console.write_line("close();");
      let output = console.read_all_output();
      assert_not_contains!(output, "addEventListener");
      assert_not_contains!(output, "alert");
      assert_not_contains!(output, "atob");
    });
  }

  #[test]
  fn repl_report_error() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec![
        r#"console.log(1); reportError(new Error("foo")); console.log(2);"#,
      ]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );

    // TODO(nayeemrmn): The REPL should report event errors and rejections.
    assert_contains!(out, "1\n2\nundefined\n");
    assert!(err.is_empty());
  }

  #[test]
  fn pty_aggregate_error() {
    let (out, err) = util::run_and_collect_output(
      true,
      "repl",
      Some(vec!["await Promise.any([])"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );

    assert_contains!(out, "AggregateError");
    assert!(err.is_empty());
  }

  #[test]
  fn repl_with_quiet_flag() {
    let (out, err) = util::run_and_collect_output_with_args(
      true,
      vec!["repl", "--quiet"],
      Some(vec!["await Promise.resolve('done')"]),
      Some(vec![("NO_COLOR".to_owned(), "1".to_owned())]),
      false,
    );
    assert!(!out.contains("Deno"));
    assert!(!out.contains("exit using ctrl+d, ctrl+c, or close()"));
    assert_ends_with!(out, "\"done\"\n");
    assert!(err.is_empty());
  }
}