LazyTest::testDropEnd() - Code Metrics - Inspection of "update documentation" - Innmind/Immutable - Measure and Improve Code Quality continuously with Scrutinizer

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by Baptiste

created 2019-12-08 17:13 UTC

LazyTest::testDropEnd() A

↳ Parent: LazyTest

Complexity

Conditions	1
Paths	1

Size

Total Lines	13
Code Lines	9

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
eloc	9
nc	1
nop	0
dl	0
loc	13
rs	9.9666
c	0
b	0
f	0

<?php
declare(strict_types = 1);

namespace Tests\Innmind\Immutable\Sequence;

use Innmind\Immutable\{
    Sequence\Lazy,
filter:
    dependency_paths: ["lib/*"]
    Sequence\Implementation,
    Map,
    Sequence,
    Str,
    Set,
    Exception\OutOfBoundException,
    Exception\CannotGroupEmptyStructure,
    Exception\ElementNotFound,
};
use function Innmind\Immutable\unwrap;
use PHPUnit\Framework\TestCase;

class LazyTest extends TestCase
{
    public function testInterface()
    {
        $this->assertInstanceOf(
            Implementation::class,
            new Lazy('mixed', fn() => yield),
        );
    }

    public function testGeneratorNotLoadedAtInstanciation()
    {
        $loaded = false;
        $sequence = new Lazy('int', function() use (&$loaded) {

            yield 1;
            $loaded = true;
        });

        $this->assertFalse($loaded);
    }

    public function testType()
    {
        $this->assertSame('int', (new Lazy('int', fn() => yield))->type());
    }

    public function testSize()
    {
        $sequence = new Lazy('int', function() {
            yield 1;
            yield 1;
        });

        $this->assertSame(2, $sequence->size());
        $this->assertSame(2, $sequence->count());
    }

    public function testIterator()
    {
        $sequence = new Lazy('int', function() {
            yield 1;
            yield 2;
            yield 3;
        });

        $this->assertSame(
            [1, 2, 3],
            \iterator_to_array($sequence->iterator()),
        );
    }

    public function testGet()
    {
        $sequence = new Lazy('int', function() {
            yield 1;
            yield 42;
            yield 3;
        });

        $this->assertSame(42, $sequence->get(1));
    }

    public function testThrowWhenIndexNotFound()
    {
        $this->expectException(OutOfBoundException::class);

        $sequence = new Lazy('int', function() {
            if (false) {
                yield 1;
            }
        });

        $sequence->get(0);
    }

    public function testDiff()
    {
        $aLoaded = false;
        $bLoaded = false;
        $a = new Lazy('int', function() use (&$aLoaded) {
            yield 1;
            yield 2;
            $aLoaded = true;
        });
        $b = new Lazy('int', function() use (&$bLoaded) {
            yield 2;
            yield 3;
            $bLoaded = true;
        });
        $c = $a->diff($b);

        $this->assertFalse($aLoaded);
        $this->assertFalse($bLoaded);
        $this->assertSame([1, 2], \iterator_to_array($a->iterator()));
        $this->assertSame([2, 3], \iterator_to_array($b->iterator()));
        $this->assertInstanceOf(Lazy::class, $c);
        $this->assertSame([1], \iterator_to_array($c->iterator()));
        $this->assertTrue($aLoaded);
        $this->assertTrue($bLoaded);
    }

    public function testDistinct()
    {
        $loaded = false;
        $a = new Lazy('int', function() use (&$loaded) {
            yield 1;
            yield 2;
            yield 1;
            $loaded = true;
        });
        $b = $a->distinct();

        $this->assertFalse($loaded);
        $this->assertSame([1, 2, 1], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Lazy::class, $b);
        $this->assertSame([1, 2], \iterator_to_array($b->iterator()));
        $this->assertTrue($loaded);
    }

    public function testDrop()
    {
        $loaded = false;
        $a = new Lazy('int', function() use (&$loaded) {
            yield 1;
            yield 2;
            yield 3;
            yield 4;
            $loaded = true;
        });
        $b = $a->drop(2);

        $this->assertFalse($loaded);
        $this->assertSame([1, 2, 3, 4], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Lazy::class, $b);
        $this->assertSame([3, 4], \iterator_to_array($b->iterator()));
        $this->assertTrue($loaded);
    }

    public function testDropEnd()
    {
        $a = new Lazy('int', function() {
            yield 1;
            yield 2;
            yield 3;
            yield 4;
        });
        $b = $a->dropEnd(2);

        $this->assertSame([1, 2, 3, 4], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Implementation::class, $b);
        $this->assertSame([1, 2], \iterator_to_array($b->iterator()));
    }

    public function testEquals()
    {
        $a = new Lazy('int', function() {
            yield 1;
            yield 2;
        });
        $b = new Lazy('int', function() {
            yield 1;
            yield 2;
            yield 3;
        });

        $this->assertTrue($a->equals($a));
        $this->assertFalse($a->equals($b));
    }

    public function testFilter()
    {
        $loaded = false;
        $a = new Lazy('int', function() use (&$loaded) {
            yield 1;
            yield 2;
            yield 3;
            yield 4;
            $loaded = true;
        });
        $b = $a->filter(fn($i) => $i % 2 === 0);

        $this->assertFalse($loaded);
        $this->assertSame([1, 2, 3, 4], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Lazy::class, $b);
        $this->assertSame([2, 4], \iterator_to_array($b->iterator()));
        $this->assertTrue($loaded);
    }

    public function testForeach()
    {
        $sequence = new Lazy('int', function() {
            yield 1;
            yield 2;
            yield 3;
            yield 4;
        });
        $calls = 0;
        $sum = 0;

        $this->assertNull($sequence->foreach(function($i) use (&$calls, &$sum) {
            ++$calls;
            $sum += $i;
        }));
        $this->assertSame(4, $calls);
        $this->assertSame(10, $sum);
    }

    public function testThrowWhenTryingToGroupEmptySequence()
    {
        $this->expectException(CannotGroupEmptyStructure::class);

        $sequence = new Lazy('int', function() {
            if (false) {
                yield 1;
            }
        });

        $sequence->groupBy(fn($i) => $i);
    }

    public function testGroupBy()
    {
        $sequence = new Lazy('int', function() {
            yield 1;
            yield 2;
            yield 3;
            yield 4;
        });
        $groups = $sequence->groupBy(fn($i) => $i % 2);

        $this->assertSame([1, 2, 3, 4], \iterator_to_array($sequence->iterator()));
        $this->assertInstanceOf(Map::class, $groups);
        $this->assertTrue($groups->isOfType('int', Sequence::class));
        $this->assertCount(2, $groups);
        $this->assertTrue($groups->get(0)->isOfType('int'));
        $this->assertTrue($groups->get(1)->isOfType('int'));
        $this->assertSame([2, 4], unwrap($groups->get(0)));
        $this->assertSame([1, 3], unwrap($groups->get(1)));
    }

    public function testThrowWhenTryingToAccessFirstElementOnEmptySequence()
    {
        $this->expectException(OutOfBoundException::class);

        $sequence = new Lazy('int', function() {
            if (false) {
                yield 1;
            }
        });

        $sequence->first();
    }

    public function testThrowWhenTryingToAccessLastElementOnEmptySequence()
    {
        $this->expectException(OutOfBoundException::class);

        $sequence = new Lazy('int', function() {
            if (false) {
                yield 1;
            }
        });

        $sequence->last();
    }

    public function testFirst()
    {
        $sequence = new Lazy('int', function() {
            yield 2;
            yield 3;
            yield 4;
        });

        $this->assertSame(2, $sequence->first());
    }

    public function testLast()
    {
        $sequence = new Lazy('int', function() {
            yield 1;
            yield 2;
            yield 3;
        });

        $this->assertSame(3, $sequence->last());
    }

    public function testContains()
    {
        $sequence = new Lazy('int', function() {
            yield 1;
            yield 2;
            yield 3;
        });

        $this->assertTrue($sequence->contains(2));
        $this->assertFalse($sequence->contains(4));
    }

    public function testIndexOf()
    {
        $sequence = new Lazy('int', function() {
            yield 1;
            yield 2;
            yield 4;
        });

        $this->assertSame(1, $sequence->indexOf(2));
        $this->assertSame(2, $sequence->indexOf(4));
    }

    public function testThrowWhenTryingToAccessIndexOfUnknownValue()
    {
        $this->expectException(ElementNotFound::class);

        $sequence = new Lazy('int', function() {
            if (false) {
                yield 1;
            }
        });

        $sequence->indexOf(1);
    }

    public function testIndices()
    {
        $loaded = false;
        $a = new Lazy('string', function() use (&$loaded) {
            yield '1';
            yield '2';
            $loaded = true;
        });
        $b = $a->indices();

        $this->assertFalse($loaded);
        $this->assertSame(['1', '2'], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Lazy::class, $b);
        $this->assertSame('int', $b->type());
        $this->assertSame([0, 1], \iterator_to_array($b->iterator()));
        $this->assertTrue($loaded);
    }

    public function testIndicesOnEmptySequence()
    {
        $a = new Lazy('string', function() {
            if (false) {
                yield 1;
            }
        });
        $b = $a->indices();

        $this->assertSame([], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Lazy::class, $b);
        $this->assertSame('int', $b->type());
        $this->assertSame([], \iterator_to_array($b->iterator()));
    }

    public function testMap()
    {
        $loaded = false;
        $a = new Lazy('int', function() use (&$loaded) {
            yield 1;
            yield 2;
            yield 3;
            $loaded = true;
        });
        $b = $a->map(fn($i) => $i * 2);

        $this->assertFalse($loaded);
        $this->assertSame([1, 2, 3], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Lazy::class, $b);
        $this->assertSame([2, 4, 6], \iterator_to_array($b->iterator()));
        $this->assertTrue($loaded);
    }

    public function testThrowWhenTryingToModifyTheTypeWhenMapping()
    {
        $this->expectException(\TypeError::class);
        $this->expectExceptionMessage('Argument 1 must be of type int, string given');

        $sequence = new Lazy('int', function() {
            yield 1;
            yield 2;
            yield 3;
        });

        \iterator_to_array($sequence->map(fn($i) => (string) $i)->iterator());
    }

    public function testPad()
    {
        $loaded = false;
        $a = new Lazy('int', function() use (&$loaded) {
            yield 1;
            yield 2;
            $loaded = true;
        });
        $b = $a->pad(4, 0);
        $c = $a->pad(1, 0);

        $this->assertFalse($loaded);
        $this->assertSame([1, 2], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Lazy::class, $b);
        $this->assertInstanceOf(Lazy::class, $c);
        $this->assertSame([1, 2, 0, 0], \iterator_to_array($b->iterator()));
        $this->assertSame([1, 2], \iterator_to_array($c->iterator()));
        $this->assertTrue($loaded);
    }

    public function testPartition()
    {
        $sequence = new Lazy('int', function() {
            yield 1;
            yield 2;
            yield 3;
            yield 4;
        });
        $partition = $sequence->partition(fn($i) => $i % 2 === 0);

        $this->assertSame([1, 2, 3, 4], \iterator_to_array($sequence->iterator()));
        $this->assertInstanceOf(Map::class, $partition);
        $this->assertTrue($partition->isOfType('bool', Sequence::class));
        $this->assertCount(2, $partition);
        $this->assertTrue($partition->get(true)->isOfType('int'));
        $this->assertTrue($partition->get(false)->isOfType('int'));
        $this->assertSame([2, 4], unwrap($partition->get(true)));
        $this->assertSame([1, 3], unwrap($partition->get(false)));
    }

    public function testSlice()
    {
        $loaded = false;
        $a = new Lazy('int', function() use (&$loaded) {
            yield 2;
            yield 3;
            yield 4;
            yield 5;
            $loaded = true;
        });
        $b = $a->slice(1, 3);

        $this->assertFalse($loaded);
        $this->assertSame([2, 3, 4, 5], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Lazy::class, $b);
        $this->assertSame([3, 4], \iterator_to_array($b->iterator()));
        $this->assertTrue($loaded);
    }

    public function testSplitAt()
    {
        $sequence = new Lazy('int', function() {
            yield 2;
            yield 3;
            yield 4;
            yield 5;
        });
        $parts = $sequence->splitAt(2);

        $this->assertSame([2, 3, 4, 5], \iterator_to_array($sequence->iterator()));
        $this->assertInstanceOf(Sequence::class, $parts);
        $this->assertTrue($parts->isOfType(Sequence::class));
        $this->assertCount(2, $parts);
        $this->assertTrue($parts->first()->isOfType('int'));
        $this->assertTrue($parts->last()->isOfType('int'));
        $this->assertSame([2, 3], unwrap($parts->first()));
        $this->assertSame([4, 5], unwrap($parts->last()));
    }

    public function testTake()
    {
        $loaded = false;
        $a = new Lazy('int', function() use (&$loaded) {
            yield 2;
            yield 3;
            yield 4;
            $loaded = true;
        });
        $b = $a->take(2);

        $this->assertFalse($loaded);
        $this->assertSame([2, 3, 4], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Lazy::class, $b);
        $this->assertSame([2, 3], \iterator_to_array($b->iterator()));
        $this->assertTrue($loaded);
    }

    public function testTakeEnd()
    {
        $a = new Lazy('int', function() {
            yield 2;
            yield 3;
            yield 4;
        });
        $b = $a->takeEnd(2);

        $this->assertSame([2, 3, 4], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Implementation::class, $b);
        $this->assertSame([3, 4], \iterator_to_array($b->iterator()));
    }

    public function testAppend()
    {
        $aLoaded = false;
        $bLoaded = false;
        $a = new Lazy('int', function() use (&$aLoaded) {
            yield 1;
            yield 2;
            $aLoaded = true;
        });
        $b = new Lazy('int', function() use (&$bLoaded) {
            yield 3;
            yield 4;
            $bLoaded = true;
        });
        $c = $a->append($b);

        $this->assertFalse($aLoaded);
        $this->assertFalse($bLoaded);
        $this->assertSame([1, 2], \iterator_to_array($a->iterator()));
        $this->assertSame([3, 4], \iterator_to_array($b->iterator()));
        $this->assertInstanceOf(Lazy::class, $c);
        $this->assertSame([1, 2, 3, 4], \iterator_to_array($c->iterator()));
        $this->assertTrue($aLoaded);
        $this->assertTrue($bLoaded);
    }

    public function testIntersect()
    {
        $aLoaded = false;
        $bLoaded = false;
        $a = new Lazy('int', function() use (&$aLoaded) {
            yield 1;
            yield 2;
            $aLoaded = true;
        });
        $b = new Lazy('int', function() use (&$bLoaded) {
            yield 2;
            yield 3;
            $bLoaded = true;
        });
        $c = $a->intersect($b);

        $this->assertFalse($aLoaded);
        $this->assertFalse($bLoaded);
        $this->assertSame([1, 2], \iterator_to_array($a->iterator()));
        $this->assertSame([2, 3], \iterator_to_array($b->iterator()));
        $this->assertInstanceOf(Lazy::class, $c);
        $this->assertSame([2], \iterator_to_array($c->iterator()));
        $this->assertTrue($aLoaded);
        $this->assertTrue($bLoaded);
    }

    public function testAdd()
    {
        $loaded = false;
        $a = new Lazy('int', function() use (&$loaded) {
            yield 1;
            $loaded = true;
        });
        $b = ($a)(2);

        $this->assertFalse($loaded);
        $this->assertSame([1], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Lazy::class, $b);
        $this->assertSame([1, 2], \iterator_to_array($b->iterator()));
        $this->assertTrue($loaded);
    }

    public function testSort()
    {
        $a = new Lazy('int', function() {
            yield 1;
            yield 4;
            yield 3;
            yield 2;
        });
        $b = $a->sort(fn($a, $b) => $a > $b);

        $this->assertSame([1, 4, 3, 2], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Lazy::class, $b);
        $this->assertSame([1, 2, 3, 4], \iterator_to_array($b->iterator()));
    }

    public function testReduce()
    {
        $sequence = new Lazy('int', function() {
            yield 1;
            yield 2;
            yield 3;
            yield 4;
        });

        $this->assertSame(10, $sequence->reduce(0, fn($sum, $i) => $sum + $i));
    }

    public function testClear()
    {
        $loaded = false;
        $a = new Lazy('int', function() use (&$loaded) {
            yield 1;
            yield 2;
            $loaded = true;
        });
        $b = $a->clear();

        $this->assertFalse($loaded);
        $this->assertInstanceOf(Implementation::class, $b);
        $this->assertSame([], \iterator_to_array($b->iterator()));
        $this->assertFalse($loaded);
        $this->assertSame([1, 2], \iterator_to_array($a->iterator()));
    }

    public function testReverse()
    {
        $loaded = false;
        $a = new Lazy('int', function() use (&$loaded) {
            yield 1;
            yield 2;
            yield 3;
            yield 4;
            $loaded = true;
        });
        $b = $a->reverse();

        $this->assertFalse($loaded);
        $this->assertSame([1, 2, 3, 4], \iterator_to_array($a->iterator()));
        $this->assertInstanceOf(Lazy::class, $b);
        $this->assertSame([4, 3, 2, 1], \iterator_to_array($b->iterator()));
        $this->assertTrue($loaded);
    }

    public function testEmpty()
    {
        $aLoaded = false;
        $bLoaded = false;
        $a = new Lazy('int', function() use (&$aLoaded) {
            yield 1;
            $aLoaded = true;
        });
        $b = new Lazy('int', function() use (&$bLoaded) {
            if (false) {
                yield 1;
            }
            $bLoaded = true;
        });

        $this->assertFalse($aLoaded);
        $this->assertFalse($bLoaded);
        $this->assertTrue($b->empty());
        $this->assertFalse($a->empty());
        $this->assertFalse($aLoaded); // still false as we don't need to load the full iterator to know if it's empty
        $this->assertTrue($bLoaded);
    }

    public function testToSequenceOf()
    {
        $loaded = false;
        $sequence = new Lazy('int', function() use (&$loaded) {
            yield 1;
            yield 2;
            yield 3;
            $loaded = true;
        });
        $sequence = $sequence->toSequenceOf('string|int', function($i) {
            yield (string) $i;
            yield $i;
        });

        $this->assertFalse($loaded);
        $this->assertInstanceOf(Sequence::class, $sequence);
        $this->assertSame(
            ['1', 1, '2', 2, '3', 3],
            unwrap($sequence),
        );
        $this->assertTrue($loaded);
    }

    public function testToSetOf()
    {
        $sequence = new Lazy('int', function() {
            yield 1;
            yield 2;
            yield 3;
        });
        $set = $sequence->toSetOf('string|int', function($i) {
            yield (string) $i;
            yield $i;
        });

        $this->assertInstanceOf(Set::class, $set);
        $this->assertSame(
            ['1', 1, '2', 2, '3', 3],
            unwrap($set),
        );
    }

    public function testToMapOf()
    {
        $sequence = new Lazy('int', function() {
            yield 1;
            yield 2;
            yield 3;
        });
        $map = $sequence->toMapOf('string', 'int', fn($i) => yield (string) $i => $i);

        $this->assertInstanceOf(Map::class, $map);
        $this->assertCount(3, $map);
        $this->assertSame(1, $map->get('1'));
        $this->assertSame(2, $map->get('2'));
        $this->assertSame(3, $map->get('3'));
    }
}


1			<?php
2			declare(strict_types = 1);
3
4			namespace Tests\Innmind\Immutable\Sequence;
5
6			use Innmind\Immutable\{
7			Sequence\Lazy,
			0 ignored issues – show Bug introduced 2019-12-08 17:26 UTC by Report Bug Copy Issue Report The type `Innmind\Immutable\Sequence\Lazy` was not found. Maybe you did not declare it correctly or list all dependencies? The issue could also be caused by a filter entry in the build configuration. If the path has been excluded in your configuration, e.g. `excluded_paths: ["lib/"]`, you can move it to the dependency path list as follows: filter: dependency_paths: ["lib/"] For further information see https://scrutinizer-ci.com/docs/tools/php/php-scrutinizer/#list-dependency-paths Loading history...
8			Sequence\Implementation,
9			Map,
10			Sequence,
11			Str,
12			Set,
13			Exception\OutOfBoundException,
14			Exception\CannotGroupEmptyStructure,
15			Exception\ElementNotFound,
16			};
17			use function Innmind\Immutable\unwrap;
18			use PHPUnit\Framework\TestCase;
19
20			class LazyTest extends TestCase
21			{
22			public function testInterface()
23			{
24			$this->assertInstanceOf(
25			Implementation::class,
26			new Lazy('mixed', fn() => yield),
27			);
28			}
29
30			public function testGeneratorNotLoadedAtInstanciation()
31			{
32			$loaded = false;
33			$sequence = new Lazy('int', function() use (&$loaded) {
			0 ignored issues – show Unused Code introduced 2019-12-08 17:26 UTC by Report Bug Copy Issue Report The assignment to `$sequence` is dead and can be removed. Loading history...
34			yield 1;
35			$loaded = true;
36			});
37
38			$this->assertFalse($loaded);
39			}
40
41			public function testType()
42			{
43			$this->assertSame('int', (new Lazy('int', fn() => yield))->type());
44			}
45
46			public function testSize()
47			{
48			$sequence = new Lazy('int', function() {
49			yield 1;
50			yield 1;
51			});
52
53			$this->assertSame(2, $sequence->size());
54			$this->assertSame(2, $sequence->count());
55			}
56
57			public function testIterator()
58			{
59			$sequence = new Lazy('int', function() {
60			yield 1;
61			yield 2;
62			yield 3;
63			});
64
65			$this->assertSame(
66			[1, 2, 3],
67			\iterator_to_array($sequence->iterator()),
68			);
69			}
70
71			public function testGet()
72			{
73			$sequence = new Lazy('int', function() {
74			yield 1;
75			yield 42;
76			yield 3;
77			});
78
79			$this->assertSame(42, $sequence->get(1));
80			}
81
82			public function testThrowWhenIndexNotFound()
83			{
84			$this->expectException(OutOfBoundException::class);
85
86			$sequence = new Lazy('int', function() {
87			if (false) {
88			yield 1;
89			}
90			});
91
92			$sequence->get(0);
93			}
94
95			public function testDiff()
96			{
97			$aLoaded = false;
98			$bLoaded = false;
99			$a = new Lazy('int', function() use (&$aLoaded) {
100			yield 1;
101			yield 2;
102			$aLoaded = true;
103			});
104			$b = new Lazy('int', function() use (&$bLoaded) {
105			yield 2;
106			yield 3;
107			$bLoaded = true;
108			});
109			$c = $a->diff($b);
110
111			$this->assertFalse($aLoaded);
112			$this->assertFalse($bLoaded);
113			$this->assertSame([1, 2], \iterator_to_array($a->iterator()));
114			$this->assertSame([2, 3], \iterator_to_array($b->iterator()));
115			$this->assertInstanceOf(Lazy::class, $c);
116			$this->assertSame([1], \iterator_to_array($c->iterator()));
117			$this->assertTrue($aLoaded);
118			$this->assertTrue($bLoaded);
119			}
120
121			public function testDistinct()
122			{
123			$loaded = false;
124			$a = new Lazy('int', function() use (&$loaded) {
125			yield 1;
126			yield 2;
127			yield 1;
128			$loaded = true;
129			});
130			$b = $a->distinct();
131
132			$this->assertFalse($loaded);
133			$this->assertSame([1, 2, 1], \iterator_to_array($a->iterator()));
134			$this->assertInstanceOf(Lazy::class, $b);
135			$this->assertSame([1, 2], \iterator_to_array($b->iterator()));
136			$this->assertTrue($loaded);
137			}
138
139			public function testDrop()
140			{
141			$loaded = false;
142			$a = new Lazy('int', function() use (&$loaded) {
143			yield 1;
144			yield 2;
145			yield 3;
146			yield 4;
147			$loaded = true;
148			});
149			$b = $a->drop(2);
150
151			$this->assertFalse($loaded);
152			$this->assertSame([1, 2, 3, 4], \iterator_to_array($a->iterator()));
153			$this->assertInstanceOf(Lazy::class, $b);
154			$this->assertSame([3, 4], \iterator_to_array($b->iterator()));
155			$this->assertTrue($loaded);
156			}
157
158			public function testDropEnd()
159			{
160			$a = new Lazy('int', function() {
161			yield 1;
162			yield 2;
163			yield 3;
164			yield 4;
165			});
166			$b = $a->dropEnd(2);
167
168			$this->assertSame([1, 2, 3, 4], \iterator_to_array($a->iterator()));
169			$this->assertInstanceOf(Implementation::class, $b);
170			$this->assertSame([1, 2], \iterator_to_array($b->iterator()));
171			}
172
173			public function testEquals()
174			{
175			$a = new Lazy('int', function() {
176			yield 1;
177			yield 2;
178			});
179			$b = new Lazy('int', function() {
180			yield 1;
181			yield 2;
182			yield 3;
183			});
184
185			$this->assertTrue($a->equals($a));
186			$this->assertFalse($a->equals($b));
187			}
188
189			public function testFilter()
190			{
191			$loaded = false;
192			$a = new Lazy('int', function() use (&$loaded) {
193			yield 1;
194			yield 2;
195			yield 3;
196			yield 4;
197			$loaded = true;
198			});
199			$b = $a->filter(fn($i) => $i % 2 === 0);
200
201			$this->assertFalse($loaded);
202			$this->assertSame([1, 2, 3, 4], \iterator_to_array($a->iterator()));
203			$this->assertInstanceOf(Lazy::class, $b);
204			$this->assertSame([2, 4], \iterator_to_array($b->iterator()));
205			$this->assertTrue($loaded);
206			}
207
208			public function testForeach()
209			{
210			$sequence = new Lazy('int', function() {
211			yield 1;
212			yield 2;
213			yield 3;
214			yield 4;
215			});
216			$calls = 0;
217			$sum = 0;
218
219			$this->assertNull($sequence->foreach(function($i) use (&$calls, &$sum) {
220			++$calls;
221			$sum += $i;
222			}));
223			$this->assertSame(4, $calls);
224			$this->assertSame(10, $sum);
225			}
226
227			public function testThrowWhenTryingToGroupEmptySequence()
228			{
229			$this->expectException(CannotGroupEmptyStructure::class);
230
231			$sequence = new Lazy('int', function() {
232			if (false) {
233			yield 1;
234			}
235			});
236
237			$sequence->groupBy(fn($i) => $i);
238			}
239
240			public function testGroupBy()
241			{
242			$sequence = new Lazy('int', function() {
243			yield 1;
244			yield 2;
245			yield 3;
246			yield 4;
247			});
248			$groups = $sequence->groupBy(fn($i) => $i % 2);
249
250			$this->assertSame([1, 2, 3, 4], \iterator_to_array($sequence->iterator()));
251			$this->assertInstanceOf(Map::class, $groups);
252			$this->assertTrue($groups->isOfType('int', Sequence::class));
253			$this->assertCount(2, $groups);
254			$this->assertTrue($groups->get(0)->isOfType('int'));
255			$this->assertTrue($groups->get(1)->isOfType('int'));
256			$this->assertSame([2, 4], unwrap($groups->get(0)));
257			$this->assertSame([1, 3], unwrap($groups->get(1)));
258			}
259
260			public function testThrowWhenTryingToAccessFirstElementOnEmptySequence()
261			{
262			$this->expectException(OutOfBoundException::class);
263
264			$sequence = new Lazy('int', function() {
265			if (false) {
266			yield 1;
267			}
268			});
269
270			$sequence->first();
271			}
272
273			public function testThrowWhenTryingToAccessLastElementOnEmptySequence()
274			{
275			$this->expectException(OutOfBoundException::class);
276
277			$sequence = new Lazy('int', function() {
278			if (false) {
279			yield 1;
280			}
281			});
282
283			$sequence->last();
284			}
285
286			public function testFirst()
287			{
288			$sequence = new Lazy('int', function() {
289			yield 2;
290			yield 3;
291			yield 4;
292			});
293
294			$this->assertSame(2, $sequence->first());
295			}
296
297			public function testLast()
298			{
299			$sequence = new Lazy('int', function() {
300			yield 1;
301			yield 2;
302			yield 3;
303			});
304
305			$this->assertSame(3, $sequence->last());
306			}
307
308			public function testContains()
309			{
310			$sequence = new Lazy('int', function() {
311			yield 1;
312			yield 2;
313			yield 3;
314			});
315
316			$this->assertTrue($sequence->contains(2));
317			$this->assertFalse($sequence->contains(4));
318			}
319
320			public function testIndexOf()
321			{
322			$sequence = new Lazy('int', function() {
323			yield 1;
324			yield 2;
325			yield 4;
326			});
327
328			$this->assertSame(1, $sequence->indexOf(2));
329			$this->assertSame(2, $sequence->indexOf(4));
330			}
331
332			public function testThrowWhenTryingToAccessIndexOfUnknownValue()
333			{
334			$this->expectException(ElementNotFound::class);
335
336			$sequence = new Lazy('int', function() {
337			if (false) {
338			yield 1;
339			}
340			});
341
342			$sequence->indexOf(1);
343			}
344
345			public function testIndices()
346			{
347			$loaded = false;
348			$a = new Lazy('string', function() use (&$loaded) {
349			yield '1';
350			yield '2';
351			$loaded = true;
352			});
353			$b = $a->indices();
354
355			$this->assertFalse($loaded);
356			$this->assertSame(['1', '2'], \iterator_to_array($a->iterator()));
357			$this->assertInstanceOf(Lazy::class, $b);
358			$this->assertSame('int', $b->type());
359			$this->assertSame([0, 1], \iterator_to_array($b->iterator()));
360			$this->assertTrue($loaded);
361			}
362
363			public function testIndicesOnEmptySequence()
364			{
365			$a = new Lazy('string', function() {
366			if (false) {
367			yield 1;
368			}
369			});
370			$b = $a->indices();
371
372			$this->assertSame([], \iterator_to_array($a->iterator()));
373			$this->assertInstanceOf(Lazy::class, $b);
374			$this->assertSame('int', $b->type());
375			$this->assertSame([], \iterator_to_array($b->iterator()));
376			}
377
378			public function testMap()
379			{
380			$loaded = false;
381			$a = new Lazy('int', function() use (&$loaded) {
382			yield 1;
383			yield 2;
384			yield 3;
385			$loaded = true;
386			});
387			$b = $a->map(fn($i) => $i * 2);
388
389			$this->assertFalse($loaded);
390			$this->assertSame([1, 2, 3], \iterator_to_array($a->iterator()));
391			$this->assertInstanceOf(Lazy::class, $b);
392			$this->assertSame([2, 4, 6], \iterator_to_array($b->iterator()));
393			$this->assertTrue($loaded);
394			}
395
396			public function testThrowWhenTryingToModifyTheTypeWhenMapping()
397			{
398			$this->expectException(\TypeError::class);
399			$this->expectExceptionMessage('Argument 1 must be of type int, string given');
400
401			$sequence = new Lazy('int', function() {
402			yield 1;
403			yield 2;
404			yield 3;
405			});
406
407			\iterator_to_array($sequence->map(fn($i) => (string) $i)->iterator());
408			}
409
410			public function testPad()
411			{
412			$loaded = false;
413			$a = new Lazy('int', function() use (&$loaded) {
414			yield 1;
415			yield 2;
416			$loaded = true;
417			});
418			$b = $a->pad(4, 0);
419			$c = $a->pad(1, 0);
420
421			$this->assertFalse($loaded);
422			$this->assertSame([1, 2], \iterator_to_array($a->iterator()));
423			$this->assertInstanceOf(Lazy::class, $b);
424			$this->assertInstanceOf(Lazy::class, $c);
425			$this->assertSame([1, 2, 0, 0], \iterator_to_array($b->iterator()));
426			$this->assertSame([1, 2], \iterator_to_array($c->iterator()));
427			$this->assertTrue($loaded);
428			}
429
430			public function testPartition()
431			{
432			$sequence = new Lazy('int', function() {
433			yield 1;
434			yield 2;
435			yield 3;
436			yield 4;
437			});
438			$partition = $sequence->partition(fn($i) => $i % 2 === 0);
439
440			$this->assertSame([1, 2, 3, 4], \iterator_to_array($sequence->iterator()));
441			$this->assertInstanceOf(Map::class, $partition);
442			$this->assertTrue($partition->isOfType('bool', Sequence::class));
443			$this->assertCount(2, $partition);
444			$this->assertTrue($partition->get(true)->isOfType('int'));
445			$this->assertTrue($partition->get(false)->isOfType('int'));
446			$this->assertSame([2, 4], unwrap($partition->get(true)));
447			$this->assertSame([1, 3], unwrap($partition->get(false)));
448			}
449
450			public function testSlice()
451			{
452			$loaded = false;
453			$a = new Lazy('int', function() use (&$loaded) {
454			yield 2;
455			yield 3;
456			yield 4;
457			yield 5;
458			$loaded = true;
459			});
460			$b = $a->slice(1, 3);
461
462			$this->assertFalse($loaded);
463			$this->assertSame([2, 3, 4, 5], \iterator_to_array($a->iterator()));
464			$this->assertInstanceOf(Lazy::class, $b);
465			$this->assertSame([3, 4], \iterator_to_array($b->iterator()));
466			$this->assertTrue($loaded);
467			}
468
469			public function testSplitAt()
470			{
471			$sequence = new Lazy('int', function() {
472			yield 2;
473			yield 3;
474			yield 4;
475			yield 5;
476			});
477			$parts = $sequence->splitAt(2);
478
479			$this->assertSame([2, 3, 4, 5], \iterator_to_array($sequence->iterator()));
480			$this->assertInstanceOf(Sequence::class, $parts);
481			$this->assertTrue($parts->isOfType(Sequence::class));
482			$this->assertCount(2, $parts);
483			$this->assertTrue($parts->first()->isOfType('int'));
484			$this->assertTrue($parts->last()->isOfType('int'));
485			$this->assertSame([2, 3], unwrap($parts->first()));
486			$this->assertSame([4, 5], unwrap($parts->last()));
487			}
488
489			public function testTake()
490			{
491			$loaded = false;
492			$a = new Lazy('int', function() use (&$loaded) {
493			yield 2;
494			yield 3;
495			yield 4;
496			$loaded = true;
497			});
498			$b = $a->take(2);
499
500			$this->assertFalse($loaded);
501			$this->assertSame([2, 3, 4], \iterator_to_array($a->iterator()));
502			$this->assertInstanceOf(Lazy::class, $b);
503			$this->assertSame([2, 3], \iterator_to_array($b->iterator()));
504			$this->assertTrue($loaded);
505			}
506
507			public function testTakeEnd()
508			{
509			$a = new Lazy('int', function() {
510			yield 2;
511			yield 3;
512			yield 4;
513			});
514			$b = $a->takeEnd(2);
515
516			$this->assertSame([2, 3, 4], \iterator_to_array($a->iterator()));
517			$this->assertInstanceOf(Implementation::class, $b);
518			$this->assertSame([3, 4], \iterator_to_array($b->iterator()));
519			}
520
521			public function testAppend()
522			{
523			$aLoaded = false;
524			$bLoaded = false;
525			$a = new Lazy('int', function() use (&$aLoaded) {
526			yield 1;
527			yield 2;
528			$aLoaded = true;
529			});
530			$b = new Lazy('int', function() use (&$bLoaded) {
531			yield 3;
532			yield 4;
533			$bLoaded = true;
534			});
535			$c = $a->append($b);
536
537			$this->assertFalse($aLoaded);
538			$this->assertFalse($bLoaded);
539			$this->assertSame([1, 2], \iterator_to_array($a->iterator()));
540			$this->assertSame([3, 4], \iterator_to_array($b->iterator()));
541			$this->assertInstanceOf(Lazy::class, $c);
542			$this->assertSame([1, 2, 3, 4], \iterator_to_array($c->iterator()));
543			$this->assertTrue($aLoaded);
544			$this->assertTrue($bLoaded);
545			}
546
547			public function testIntersect()
548			{
549			$aLoaded = false;
550			$bLoaded = false;
551			$a = new Lazy('int', function() use (&$aLoaded) {
552			yield 1;
553			yield 2;
554			$aLoaded = true;
555			});
556			$b = new Lazy('int', function() use (&$bLoaded) {
557			yield 2;
558			yield 3;
559			$bLoaded = true;
560			});
561			$c = $a->intersect($b);
562
563			$this->assertFalse($aLoaded);
564			$this->assertFalse($bLoaded);
565			$this->assertSame([1, 2], \iterator_to_array($a->iterator()));
566			$this->assertSame([2, 3], \iterator_to_array($b->iterator()));
567			$this->assertInstanceOf(Lazy::class, $c);
568			$this->assertSame([2], \iterator_to_array($c->iterator()));
569			$this->assertTrue($aLoaded);
570			$this->assertTrue($bLoaded);
571			}
572
573			public function testAdd()
574			{
575			$loaded = false;
576			$a = new Lazy('int', function() use (&$loaded) {
577			yield 1;
578			$loaded = true;
579			});
580			$b = ($a)(2);
581
582			$this->assertFalse($loaded);
583			$this->assertSame([1], \iterator_to_array($a->iterator()));
584			$this->assertInstanceOf(Lazy::class, $b);
585			$this->assertSame([1, 2], \iterator_to_array($b->iterator()));
586			$this->assertTrue($loaded);
587			}
588
589			public function testSort()
590			{
591			$a = new Lazy('int', function() {
592			yield 1;
593			yield 4;
594			yield 3;
595			yield 2;
596			});
597			$b = $a->sort(fn($a, $b) => $a > $b);
598
599			$this->assertSame([1, 4, 3, 2], \iterator_to_array($a->iterator()));
600			$this->assertInstanceOf(Lazy::class, $b);
601			$this->assertSame([1, 2, 3, 4], \iterator_to_array($b->iterator()));
602			}
603
604			public function testReduce()
605			{
606			$sequence = new Lazy('int', function() {
607			yield 1;
608			yield 2;
609			yield 3;
610			yield 4;
611			});
612
613			$this->assertSame(10, $sequence->reduce(0, fn($sum, $i) => $sum + $i));
614			}
615
616			public function testClear()
617			{
618			$loaded = false;
619			$a = new Lazy('int', function() use (&$loaded) {
620			yield 1;
621			yield 2;
622			$loaded = true;
623			});
624			$b = $a->clear();
625
626			$this->assertFalse($loaded);
627			$this->assertInstanceOf(Implementation::class, $b);
628			$this->assertSame([], \iterator_to_array($b->iterator()));
629			$this->assertFalse($loaded);
630			$this->assertSame([1, 2], \iterator_to_array($a->iterator()));
631			}
632
633			public function testReverse()
634			{
635			$loaded = false;
636			$a = new Lazy('int', function() use (&$loaded) {
637			yield 1;
638			yield 2;
639			yield 3;
640			yield 4;
641			$loaded = true;
642			});
643			$b = $a->reverse();
644
645			$this->assertFalse($loaded);
646			$this->assertSame([1, 2, 3, 4], \iterator_to_array($a->iterator()));
647			$this->assertInstanceOf(Lazy::class, $b);
648			$this->assertSame([4, 3, 2, 1], \iterator_to_array($b->iterator()));
649			$this->assertTrue($loaded);
650			}
651
652			public function testEmpty()
653			{
654			$aLoaded = false;
655			$bLoaded = false;
656			$a = new Lazy('int', function() use (&$aLoaded) {
657			yield 1;
658			$aLoaded = true;
659			});
660			$b = new Lazy('int', function() use (&$bLoaded) {
661			if (false) {
662			yield 1;
663			}
664			$bLoaded = true;
665			});
666
667			$this->assertFalse($aLoaded);
668			$this->assertFalse($bLoaded);
669			$this->assertTrue($b->empty());
670			$this->assertFalse($a->empty());
671			$this->assertFalse($aLoaded); // still false as we don't need to load the full iterator to know if it's empty
672			$this->assertTrue($bLoaded);
673			}
674
675			public function testToSequenceOf()
676			{
677			$loaded = false;
678			$sequence = new Lazy('int', function() use (&$loaded) {
679			yield 1;
680			yield 2;
681			yield 3;
682			$loaded = true;
683			});
684			$sequence = $sequence->toSequenceOf('string\|int', function($i) {
685			yield (string) $i;
686			yield $i;
687			});
688
689			$this->assertFalse($loaded);
690			$this->assertInstanceOf(Sequence::class, $sequence);
691			$this->assertSame(
692			['1', 1, '2', 2, '3', 3],
693			unwrap($sequence),
694			);
695			$this->assertTrue($loaded);
696			}
697
698			public function testToSetOf()
699			{
700			$sequence = new Lazy('int', function() {
701			yield 1;
702			yield 2;
703			yield 3;
704			});
705			$set = $sequence->toSetOf('string\|int', function($i) {
706			yield (string) $i;
707			yield $i;
708			});
709
710			$this->assertInstanceOf(Set::class, $set);
711			$this->assertSame(
712			['1', 1, '2', 2, '3', 3],
713			unwrap($set),
714			);
715			}
716
717			public function testToMapOf()
718			{
719			$sequence = new Lazy('int', function() {
720			yield 1;
721			yield 2;
722			yield 3;
723			});
724			$map = $sequence->toMapOf('string', 'int', fn($i) => yield (string) $i => $i);
725
726			$this->assertInstanceOf(Map::class, $map);
727			$this->assertCount(3, $map);
728			$this->assertSame(1, $map->get('1'));
729			$this->assertSame(2, $map->get('2'));
730			$this->assertSame(3, $map->get('3'));
731			}
732			}
733

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LazyTest::testDropEnd() A

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