test/iterable_zip_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 "dart:collection";

import "package:test/test.dart";

import "package:collection/collection.dart";

/// Iterable like [base] except that it throws when value equals [errorValue].
Iterable iterError(Iterable base, int errorValue) {
  // ignore: only_throw_errors
  return base.map((x) => x == errorValue ? throw "BAD" : x);
}

main() {
  test("Basic", () {
    expect(
        new IterableZip([
          [1, 2, 3],
          [4, 5, 6],
          [7, 8, 9]
        ]),
        equals([
          [1, 4, 7],
          [2, 5, 8],
          [3, 6, 9]
        ]));
  });

  test("Uneven length 1", () {
    expect(
        new IterableZip([
          [1, 2, 3, 99, 100],
          [4, 5, 6],
          [7, 8, 9]
        ]),
        equals([
          [1, 4, 7],
          [2, 5, 8],
          [3, 6, 9]
        ]));
  });

  test("Uneven length 2", () {
    expect(
        new IterableZip([
          [1, 2, 3],
          [4, 5, 6, 99, 100],
          [7, 8, 9]
        ]),
        equals([
          [1, 4, 7],
          [2, 5, 8],
          [3, 6, 9]
        ]));
  });

  test("Uneven length 3", () {
    expect(
        new IterableZip([
          [1, 2, 3],
          [4, 5, 6],
          [7, 8, 9, 99, 100]
        ]),
        equals([
          [1, 4, 7],
          [2, 5, 8],
          [3, 6, 9]
        ]));
  });

  test("Uneven length 3", () {
    expect(
        new IterableZip([
          [1, 2, 3, 98],
          [4, 5, 6],
          [7, 8, 9, 99, 100]
        ]),
        equals([
          [1, 4, 7],
          [2, 5, 8],
          [3, 6, 9]
        ]));
  });

  test("Empty 1", () {
    expect(
        new IterableZip([
          [],
          [4, 5, 6],
          [7, 8, 9]
        ]),
        equals([]));
  });

  test("Empty 2", () {
    expect(
        new IterableZip([
          [1, 2, 3],
          [],
          [7, 8, 9]
        ]),
        equals([]));
  });

  test("Empty 3", () {
    expect(
        new IterableZip([
          [1, 2, 3],
          [4, 5, 6],
          []
        ]),
        equals([]));
  });

  test("Empty source", () {
    expect(new IterableZip([]), equals([]));
  });

  test("Single Source", () {
    expect(
        new IterableZip([
          [1, 2, 3]
        ]),
        equals([
          [1],
          [2],
          [3]
        ]));
  });

  test("Not-lists", () {
    // Use other iterables than list literals.
    Iterable it1 = [1, 2, 3, 4, 5, 6].where((x) => x < 4);
    Set it2 = new LinkedHashSet()..add(4)..add(5)..add(6);
    Iterable it3 = (new LinkedHashMap()
          ..[7] = 0
          ..[8] = 0
          ..[9] = 0)
        .keys;
    Iterable<Iterable> allIts =
        new Iterable.generate(3, (i) => [it1, it2, it3][i]);
    expect(
        new IterableZip(allIts),
        equals([
          [1, 4, 7],
          [2, 5, 8],
          [3, 6, 9]
        ]));
  });

  test("Error 1", () {
    expect(
        () => new IterableZip([
              iterError([1, 2, 3], 2),
              [4, 5, 6],
              [7, 8, 9]
            ]).toList(),
        throwsA(equals("BAD")));
  });

  test("Error 2", () {
    expect(
        () => new IterableZip([
              [1, 2, 3],
              iterError([4, 5, 6], 5),
              [7, 8, 9]
            ]).toList(),
        throwsA(equals("BAD")));
  });

  test("Error 3", () {
    expect(
        () => new IterableZip([
              [1, 2, 3],
              [4, 5, 6],
              iterError([7, 8, 9], 8)
            ]).toList(),
        throwsA(equals("BAD")));
  });

  test("Error at end", () {
    expect(
        () => new IterableZip([
              [1, 2, 3],
              iterError([4, 5, 6], 6),
              [7, 8, 9]
            ]).toList(),
        throwsA(equals("BAD")));
  });

  test("Error before first end", () {
    expect(
        () => new IterableZip([
              iterError([1, 2, 3, 4], 4),
              [4, 5, 6],
              [7, 8, 9]
            ]).toList(),
        throwsA(equals("BAD")));
  });

  test("Error after first end", () {
    expect(
        new IterableZip([
          [1, 2, 3],
          [4, 5, 6],
          iterError([7, 8, 9, 10], 10)
        ]),
        equals([
          [1, 4, 7],
          [2, 5, 8],
          [3, 6, 9]
        ]));
  });
}