tests/web/dart2js/truncation_errors_test.dart

// Copyright (c) 2015, 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.

// Check that exception messages for truncating operations contains the
// operands.

import 'package:expect/expect.dart';

@pragma('dart2js:noInline')
@pragma('dart2js:assumeDynamic')
confuse(x) => x;

void find1(expected, thunk) {
  if (thunk == null) return;
  var returned, exceptionText;
  try {
    returned = thunk();
  } catch (e) {
    exceptionText = '$e';
  }
  if (exceptionText == null) {
    Expect.fail(
      'Expected exception containing "$expected", returned: $returned',
    );
  }
  Expect.isTrue(
    exceptionText.contains(expected),
    'Expected "$expected" in "$exceptionText"',
  );
}

void find(expected, [thunk1, thunk2, thunk3, thunk4]) {
  find1(expected, thunk1);
  find1(expected, thunk2);
  find1(expected, thunk3);
  find1(expected, thunk4);
}

main() {
  var NaN = double.nan;
  var Infinity = double.infinity;

  find(
    ' Infinity: 123 ~/ 0',
    () => confuse(123) ~/ confuse(0),
    () => confuse(123) ~/ 0,
    () => 123 ~/ confuse(0),
    () => 123 ~/ 0,
  );

  find(
    '-Infinity: 123 ~/ -0.0',
    () => confuse(123) ~/ confuse(-0.0),
    () => confuse(123) ~/ -0.0,
    () => 123 ~/ confuse(-0.0),
    () => 123 ~/ -0.0,
  );

  find(
    ' NaN: NaN ~/ 123',
    () => confuse(NaN) ~/ confuse(123),
    () => confuse(NaN) ~/ 123,
    () => NaN ~/ confuse(123),
    () => NaN ~/ 123,
  );

  find(
    ' Infinity: 1e+200 ~/ 1e-200',
    () => confuse(1e200) ~/ confuse(1e-200),
    () => confuse(1e200) ~/ 1e-200,
    () => 1e200 ~/ confuse(1e-200),
    () => 1e200 ~/ 1e-200,
  );

  find('NaN.toInt()', () => confuse(NaN).toInt(), () => NaN.toInt());
  find(
    ' Infinity.toInt()',
    () => confuse(Infinity).toInt(),
    () => Infinity.toInt(),
  );
  find(
    '-Infinity.toInt()',
    () => confuse(-Infinity).toInt(),
    () => (-Infinity).toInt(),
  );

  find('NaN.ceil()', () => confuse(NaN).ceil(), () => NaN.ceil());
  find(
    ' Infinity.ceil()',
    () => confuse(Infinity).ceil(),
    () => Infinity.ceil(),
  );
  find(
    '-Infinity.ceil()',
    () => confuse(-Infinity).ceil(),
    () => (-Infinity).ceil(),
  );

  find('NaN.floor()', () => confuse(NaN).floor(), () => NaN.floor());
  find(
    ' Infinity.floor()',
    () => confuse(Infinity).floor(),
    () => Infinity.floor(),
  );
  find(
    '-Infinity.floor()',
    () => confuse(-Infinity).floor(),
    () => (-Infinity).floor(),
  );

  find('NaN.round()', () => confuse(NaN).round(), () => NaN.round());
  find(
    ' Infinity.round()',
    () => confuse(Infinity).round(),
    () => Infinity.round(),
  );
  find(
    '-Infinity.round()',
    () => confuse(-Infinity).round(),
    () => (-Infinity).round(),
  );

  // `truncate()` is the same as `toInt()`.
  // We could change the runtime so that `truncate` is reported.
  find('NaN.toInt()', () => confuse(NaN).truncate(), () => NaN.truncate());
  find(
    ' Infinity.toInt()',
    () => confuse(Infinity).truncate(),
    () => Infinity.truncate(),
  );
  find(
    '-Infinity.toInt()',
    () => confuse(-Infinity).truncate(),
    () => (-Infinity).truncate(),
  );
}