tests/lib/convert/streamed_conversion_json_encode1_test.dart

// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import "package:expect/expect.dart";
import 'dart:async';
import 'dart:convert';
import "package:async_helper/async_helper.dart";

final TESTS = [
    [ 5, '5' ],
    [ -42, '-42' ],
    [ 3.14, '3.14' ],
    [ true, 'true' ],
    [ false, 'false' ],
    [ null, 'null' ],
    [ 'quote"or\'', '"quote\\"or\'"' ],
    [ '', '""' ],
    [ [], "[]" ],
    [ [3, -4.5, true, "hi", false], '[3,-4.5,true,"hi",false]' ],
    [ [null], "[null]" ],
    [ [[null]], "[[null]]" ],
    [ [[3]], "[[3]]" ],
    [ {}, "{}" ],
    [ { "x": 3, "y": 4.5, "z": "hi", "u": true, "v": false },
      '{"x":3,"y":4.5,"z":"hi","u":true,"v":false}' ],
    [ { "x": null }, '{"x":null}' ],
    [ { "x": {} }, '{"x":{}}' ],
    // Note that -0.0 won't be treated the same in JS. The Json spec seems to
    // allow it, though.
    [ { "hi there": 499, "'":-0.0 }, '{"hi there":499,"\'":-0.0}' ],
    [ r'\foo', r'"\\foo"' ],
  ];

Stream<String> encode(Object o) {
  var encoder = new JsonEncoder();
  StreamController controller;
  controller = new StreamController(onListen: () {
    controller.add(o);
    controller.close();
  });
  return controller.stream.transform(encoder);
}

void testNoPause(String expected, Object o) {
  asyncStart();
  Stream stream = encode(o);
  stream.toList().then((list) {
    StringBuffer buffer = new StringBuffer();
    buffer.writeAll(list);
    Expect.stringEquals(expected, buffer.toString());
    asyncEnd();
  });
}

void testWithPause(String expected, Object o) {
  asyncStart();
  Stream stream = encode(o);
  StringBuffer buffer = new StringBuffer();
  var sub;
  sub = stream.listen((x) {
    buffer.write(x);
    sub.pause(new Future.delayed(Duration.ZERO));
  }, onDone: () {
    Expect.stringEquals(expected, buffer.toString());
    asyncEnd();
  });
}

void main() {
  for (var test in TESTS) {
    var o = test[0];
    var expected = test[1];
    testNoPause(expected, o);
    testWithPause(expected, o);
  }
}