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range_test.dart
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import 'package:dartx/dartx.dart';
import 'package:test/test.dart';
void main() {
group('DoubleRange', () {
test('rangeTo with two doubles returns DoubleRange', () {
expect(4.2.rangeTo(2.2), isA<DoubleRange>());
});
test('start', () {
expect(2.7.rangeTo(4.2).start, 2.7);
expect(2.7.rangeTo(4.2).start, isA<double>());
});
test('endInclusive', () {
expect(2.7.rangeTo(4.2).endInclusive, 4.2);
expect(2.7.rangeTo(4.2).endInclusive, isA<double>());
});
test('contains double (upwards)', () {
expect(2.7.rangeTo(4.2).contains(3.0), isTrue);
expect(2.7.rangeTo(4.2).contains(5.0), isFalse);
});
test('contains int (upwards)', () {
// compiler does the conversion from int to double
expect(2.7.rangeTo(4.2).contains(3), isTrue);
expect(2.7.rangeTo(4.2).contains(5), isFalse);
// makes sure contains accepts int
expect(2.7.rangeTo(4.2).contains(3.0.toInt()), isTrue);
expect(2.7.rangeTo(4.2).contains(5.0.toInt()), isFalse);
});
test('contains double (downwards)', () {
expect(4.2.rangeTo(2.7).contains(3.1), isTrue);
expect(4.2.rangeTo(2.7).contains(5.1), isFalse);
});
test('contains int (downwards)', () {
expect(4.2.rangeTo(2.7).contains(3), isTrue);
expect(4.2.rangeTo(2.7).contains(5), isFalse);
});
test('mix with int returns DoubleRange', () {
expect(4.2.rangeTo(2), isA<DoubleRange>());
// This is impossible because dart doesn't support overrides
// expect(4.rangeTo(2.7), isA<DoubleRange>());
});
test('toString', () {
expect(4.2.rangeTo(2.7).toString(), '4.2..2.7');
});
test('hashcode equal no matter the order', () {
expect(4.2.rangeTo(2.7).hashCode, 2.7.rangeTo(4.2).hashCode);
});
test('equals same range', () {
expect(4.2.rangeTo(2.7), 4.2.rangeTo(2.7));
});
test('not equals when items swapped', () {
expect(4.2.rangeTo(2.7), isNot(2.7.rangeTo(4.2)));
});
});
group('ComparableRange', () {
test('start', () {
expect(DateTime(1995).rangeTo(DateTime(2020)).start, DateTime(1995));
expect(DateTime(1995).rangeTo(DateTime(2020)).start, isA<DateTime>());
});
test('endInclusive', () {
expect(
DateTime(1995).rangeTo(DateTime(2020)).endInclusive,
DateTime(2020),
);
expect(
DateTime(1995).rangeTo(DateTime(2020)).endInclusive,
isA<DateTime>(),
);
});
test('contains (upwards)', () {
expect(
DateTime(1995).rangeTo(DateTime(2020)).contains(DateTime(2016)),
isTrue,
);
expect(
DateTime(1995).rangeTo(DateTime(2020)).contains(DateTime(1988)),
isFalse,
);
});
test('contains (downwards)', () {
expect(
DateTime(2020).rangeTo(DateTime(1995)).contains(DateTime(2016)),
isTrue,
);
expect(
DateTime(2020).rangeTo(DateTime(1995)).contains(DateTime(1988)),
isFalse,
);
});
test('rangeTo returns ComparableRange<DateTime>', () {
expect(
DateTime(1995).rangeTo(DateTime(2020)),
isA<ComparableRange<DateTime>>(),
);
});
test('hashcode equal no matter the order', () {
expect(
DateTime(1995).rangeTo(DateTime(2020)).hashCode,
DateTime(2020).rangeTo(DateTime(1995)).hashCode,
);
});
test('equal', () {
expect(
DateTime(1995).rangeTo(DateTime(2020)),
DateTime(1995).rangeTo(DateTime(2020)),
);
expect('a'.rangeTo('b'), 'a'.rangeTo('b'));
});
test('not equals when items swapped', () {
expect(
DateTime(1995).rangeTo(DateTime(2020)),
isNot(DateTime(2020).rangeTo(DateTime(1995))),
);
});
test('toString', () {
expect(
DateTime(1995).rangeTo(DateTime(2020)).toString(),
'1995-01-01 00:00:00.000..2020-01-01 00:00:00.000',
);
});
test('alphabetical range', () {
final alphabet = 'a'.rangeTo('z');
expect(alphabet.contains('a'), isTrue);
expect(alphabet.contains('b'), isTrue);
expect(alphabet.contains('y'), isTrue);
expect(alphabet.contains('z'), isTrue);
expect(alphabet.contains('A'), isFalse);
expect(alphabet.contains('B'), isFalse);
expect(alphabet.contains('Y'), isFalse);
expect(alphabet.contains('Z'), isFalse);
});
});
group('IntRange', () {
test('start', () {
expect(12.rangeTo(17).start, 12);
expect(12.rangeTo(17).start, isA<int>());
});
test('endInclusive', () {
expect(12.rangeTo(17).endInclusive, 17);
expect(12.rangeTo(17).endInclusive, isA<int>());
});
test('contains double (upwards)', () {
expect(12.rangeTo(17).contains(13.1), isTrue);
expect(12.rangeTo(17).contains(18.1), isFalse);
});
test('contains int (upwards)', () {
// compiler does the conversion from int to double
expect(12.rangeTo(17).contains(13), isTrue);
expect(12.rangeTo(17).contains(18), isFalse);
});
test('contains double (downwards)', () {
expect(17.rangeTo(12).contains(13.1), isTrue);
expect(17.rangeTo(12).contains(18.1), isFalse);
});
test('contains int (downwards)', () {
expect(17.rangeTo(12).contains(13), isTrue);
expect(17.rangeTo(12).contains(18), isFalse);
});
test('rangeTo with two ints returns IntRange', () {
expect(17.rangeTo(12), isA<IntRange>());
});
test('hashcode equal no matter the order', () {
expect(12.rangeTo(17).hashCode, 17.rangeTo(12).hashCode);
});
test('not equals when items swapped', () {
expect(3.rangeTo(9), isNot(9.rangeTo(3)));
});
test('equal', () {
expect(3.rangeTo(9), 3.rangeTo(9));
});
test('toString', () {
expect(3.rangeTo(9).toString(), '3..9');
});
});
group('IntProgression', () {
test('stepSize', () {
expect(5.rangeTo(10).step(2).stepSize, 2);
});
test('upwards', () {
expect(5.rangeTo(10).toList(), [5, 6, 7, 8, 9, 10]);
});
test('downwards', () {
expect(6.rangeTo(3).toList(), [6, 5, 4, 3]);
});
test('never empty, at least emits the start value', () {
expect(6.rangeTo(6).toList(), [6]);
});
test('step upwards', () {
expect(5.rangeTo(10).step(2).toList(), [5, 7, 9]);
});
test('step downwards', () {
expect(6.rangeTo(3).step(2).toList(), [6, 4]);
});
test('step must be positive', () {
expect(() => 1.rangeTo(10).step(0), throwsA(isA<RangeError>()));
expect(() => 1.rangeTo(10).step(-2), throwsA(isA<RangeError>()));
});
test('isEmpty always returns false', () {
expect(6.rangeTo(6).isEmpty, isFalse);
expect(6.rangeTo(1).isEmpty, isFalse);
expect(6.rangeTo(19).isEmpty, isFalse);
expect(0.rangeTo(0).isEmpty, isFalse);
expect(0.rangeTo(-1).isEmpty, isFalse);
});
test('isNotEmpty always returns true', () {
expect(6.rangeTo(6).isNotEmpty, isTrue);
expect(6.rangeTo(1).isNotEmpty, isTrue);
expect(6.rangeTo(19).isNotEmpty, isTrue);
expect(0.rangeTo(0).isNotEmpty, isTrue);
expect(0.rangeTo(-1).isNotEmpty, isTrue);
});
group('contains', () {
test('contains double', () {
final range = 2.rangeTo(-2);
expect(range.contains(3.0), isFalse);
expect(range.contains(2.9), isFalse);
expect(range.contains(2.1), isFalse);
expect(range.contains(2.0), isTrue);
expect(range.contains(1.0), isTrue);
expect(range.contains(0.5), isTrue);
expect(range.contains(0.0), isTrue);
expect(range.contains(-0.5), isTrue);
expect(range.contains(-1.0), isTrue);
expect(range.contains(-2.0), isTrue);
expect(range.contains(-2.1), isFalse);
expect(range.contains(-2.9), isFalse);
expect(range.contains(-3.0), isFalse);
});
test('contains double downwards', () {
final range = (-2).rangeTo(2);
expect(range.contains(-3.0), isFalse);
expect(range.contains(-2.9), isFalse);
expect(range.contains(-2.1), isFalse);
expect(range.contains(-2.0), isTrue);
expect(range.contains(-1.0), isTrue);
expect(range.contains(-0.5), isTrue);
expect(range.contains(0.0), isTrue);
expect(range.contains(0.5), isTrue);
expect(range.contains(1.0), isTrue);
expect(range.contains(2.0), isTrue);
expect(range.contains(2.1), isFalse);
expect(range.contains(2.9), isFalse);
expect(range.contains(3.0), isFalse);
});
test('contains with step', () {
final range = 10.rangeTo(19).step(2); // [10, 12, 14, 16, 18]
expect(range.start, 10);
expect(range.endInclusive, 18);
expect(range.stepSize, 2);
expect(range.contains(9), isFalse);
expect(range.contains(10), isTrue);
expect(range.contains(11), isFalse);
expect(range.contains(12), isTrue);
expect(range.contains(13), isFalse);
expect(range.contains(14), isTrue);
expect(range.contains(15), isFalse);
expect(range.contains(16), isTrue);
expect(range.contains(17), isFalse);
expect(range.contains(18), isTrue);
expect(range.contains(19), isFalse);
expect(range.contains(20), isFalse);
});
test('contains with step downwards and negative', () {
final range = 2.rangeTo(-10).step(3); // [2, -1, -4, -7, -10]
expect(range.start, 2);
expect(range.endInclusive, -10);
expect(range.stepSize, 3);
expect(range.contains(3), isFalse);
expect(range.contains(2), isTrue);
expect(range.contains(0), isFalse);
expect(range.contains(-1), isTrue);
expect(range.contains(-2), isFalse);
expect(range.contains(-3), isFalse);
expect(range.contains(-4), isTrue);
expect(range.contains(-5), isFalse);
expect(range.contains(-6), isFalse);
expect(range.contains(-7), isTrue);
expect(range.contains(-8), isFalse);
expect(range.contains(-9), isFalse);
expect(range.contains(-10), isTrue);
expect(range.contains(-11), isFalse);
});
});
group('last', () {
test(
'empty means first == endInclusive, '
'endInclusive and last are equivalent', () {
expect(IntRange(0, 0).last, 0);
expect(IntRange(0, 0).endInclusive, 0);
expect(IntRange(0, 0).toIterable().last, 0);
expect(IntRange(2, 2).last, 2);
expect(IntRange(2, 2).endInclusive, 2);
expect(IntRange(2, 2).toIterable().last, 2);
expect(IntRange(-4, -4).last, -4);
expect(IntRange(-4, -4).endInclusive, -4);
expect(IntRange(-4, -4).toIterable().last, -4);
});
test('last returns the endInclusive value', () {
expect(IntRange(0, 10).last, 10);
expect(IntRange(0, 10).toIterable().last, 10);
});
test('step 2 returns the last value dividable by 2', () {
expect(IntProgression(0, 9, step: 2).last, 8);
expect(IntProgression(0, 9, step: 2).toIterable().last, 8);
});
test('lastWhere', () {
final range = IntProgression(0, 9, step: 3);
bool isEven(int it) => it.isEven;
expect(range.last, 9);
expect(range.lastWhere(isEven), 6);
});
});
group('first', () {
test('empty means first == endInclusive, start and first are equivalent',
() {
expect(IntRange(0, 0).first, 0);
expect(IntRange(0, 0).start, 0);
expect(IntRange(0, 0).toIterable().first, 0);
expect(IntRange(2, 2).first, 2);
expect(IntRange(2, 2).start, 2);
expect(IntRange(2, 2).toIterable().first, 2);
expect(IntRange(-4, -4).first, -4);
expect(IntRange(-4, -4).start, -4);
expect(IntRange(-4, -4).toIterable().first, -4);
});
test('first returns the endInclusive value', () {
expect(IntRange(2, 10).first, 2);
expect(IntRange(2, 10).toIterable().first, 2);
});
test('step 2 returns the first value', () {
// step 2 doesn't mean first needs to be dividable by 2.
// It starts stepping at 2
expect(IntProgression(1, 9, step: 2).first, 1);
expect(IntProgression(1, 9, step: 2).toIterable().first, 1);
});
test('firstWhere minds the predicate', () {
final range = IntProgression(1, 10, step: 3);
bool isEven(int it) => it.isEven;
expect(range.first, 1);
expect(range.firstWhere(isEven), 4);
});
});
});
}