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<?php |
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declare(strict_types = 1); |
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namespace Tests\Innmind\Immutable; |
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use Innmind\Immutable\Maybe; |
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use PHPUnit\Framework\TestCase; |
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use Innmind\BlackBox\{ |
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PHPUnit\BlackBox, |
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Set, |
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}; |
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class MaybeTest extends TestCase |
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{ |
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use BlackBox; |
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public function testMapIsNotCalledWhenNoValue() |
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{ |
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$maybe = Maybe::nothing(); |
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$this->assertInstanceOf(Maybe::class, $maybe->map(static function() { |
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throw new \Exception; |
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})); |
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} |
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public function testMaybeNothingMatch() |
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{ |
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$this |
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->forAll( |
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$this->value(), |
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$this->value(), |
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) |
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->then(function($unwanted, $nothing) { |
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$this->assertSame( |
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$nothing, |
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Maybe::nothing()->match( |
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static fn() => $unwanted, |
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static fn() => $nothing, |
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), |
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); |
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}); |
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} |
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public function testMaybeOfNullReturnsANothingImplementation() |
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{ |
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$this |
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->forAll( |
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$this->value(), |
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$this->value(), |
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) |
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->then(function($unwanted, $nothing) { |
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$this->assertSame( |
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$nothing, |
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Maybe::of(null)->match( |
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static fn() => $unwanted, |
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static fn() => $nothing, |
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), |
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); |
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}); |
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} |
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public function testMaybeJustMatch() |
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{ |
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$this |
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->forAll( |
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$this->value(), |
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$this->value(), |
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$this->value(), |
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) |
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->then(function($initial, $just, $nothing) { |
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$this->assertSame( |
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$just, |
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Maybe::just($initial)->match( |
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function($value) use ($initial, $just) { |
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$this->assertSame($initial, $value); |
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return $just; |
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}, |
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static fn() => $nothing, |
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), |
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); |
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}); |
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} |
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public function testMaybeOfValueReturnsAJustImplementation() |
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{ |
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$this |
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->forAll( |
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$this->value(), |
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$this->value(), |
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$this->value(), |
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) |
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->then(function($initial, $just, $nothing) { |
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$this->assertSame( |
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$just, |
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Maybe::of($initial)->match( |
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static fn() => $just, |
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static fn() => $nothing, |
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), |
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); |
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}); |
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} |
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public function testMapIsCalledWhenThereIsAValue() |
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{ |
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$this |
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->forAll( |
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$this->value(), |
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$this->value(), |
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$this->value(), |
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) |
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->then(function($initial, $mapped, $unwanted) { |
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$maybe = Maybe::just($initial); |
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$maybe2 = $maybe->map(function($value) use ($initial, $mapped) { |
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$this->assertSame($initial, $value); |
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return $mapped; |
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}); |
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$this->assertInstanceOf(Maybe::class, $maybe2); |
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$this->assertNotSame($maybe, $maybe2); |
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$this->assertSame( |
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$mapped, |
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$maybe2->match( |
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static fn($value) => $value, |
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static fn() => $unwanted, |
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), |
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); |
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}); |
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} |
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public function testFlatMapIsNotCalledWhenNoValue() |
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{ |
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$this->assertInstanceOf(Maybe::class, Maybe::nothing()->flatMap(static function() { |
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throw new \Exception; |
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})); |
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} |
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public function testFlatMapIsCalledWhenThereIsAValue() |
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{ |
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$this |
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->forAll( |
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$this->value(), |
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$this->value(), |
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$this->value(), |
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) |
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->then(function($initial, $mapped, $nothing) { |
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$expected = Maybe::just($mapped); |
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$maybe = Maybe::just($initial)->flatMap(function($value) use ($initial, $expected) { |
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$this->assertSame($initial, $value); |
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return $expected; |
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}); |
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$this->assertSame($expected, $maybe); |
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$this->assertSame( |
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$mapped, |
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$maybe->match( |
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static fn($value) => $value, |
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static fn() => $nothing, |
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), |
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); |
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}); |
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} |
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public function testOtherwiseIsCalledWhenNoValue() |
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{ |
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$this |
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->forAll(Set\AnyType::any()) |
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->then(function($value) { |
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$expected = Maybe::of($value); |
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$this->assertSame( |
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$expected, |
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Maybe::nothing()->otherwise(static fn() => $expected), |
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); |
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}); |
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} |
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public function testOtherwiseIsNotCalledWhenThereIsAValue() |
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{ |
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$this |
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->forAll( |
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$this->value(), |
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$this->value(), |
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) |
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->then(function($initial, $nothing) { |
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$maybe = Maybe::just($initial); |
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$maybe2 = $maybe->otherwise(static function() { |
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throw new \Exception; |
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}); |
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$this->assertInstanceOf(Maybe::class, $maybe2); |
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$this->assertNotSame($maybe, $maybe2); |
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$this->assertSame( |
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$initial, |
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$maybe2->match( |
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static fn($value) => $value, |
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static fn() => $nothing, |
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), |
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); |
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}); |
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} |
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public function testFilterPredicateIsNotCalledWhenNoValue() |
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{ |
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$this->assertInstanceOf(Maybe::class, Maybe::nothing()->filter(static function() { |
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throw new \Exception; |
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})); |
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} |
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public function testReturnItselfWhenFilterPredicateReturnsTrue() |
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{ |
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$this |
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->forAll( |
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$this->value(), |
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$this->value(), |
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) |
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->then(function($initial, $nothing) { |
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$maybe = Maybe::just($initial)->filter(function($value) use ($initial) { |
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$this->assertSame($initial, $value); |
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return true; |
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}); |
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$this->assertInstanceOf(Maybe::class, $maybe); |
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$this->assertSame( |
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$initial, |
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$maybe->match( |
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static fn($value) => $value, |
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static fn() => $nothing, |
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), |
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); |
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}); |
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} |
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public function testReturnsANothingWhenFilterPredicateReturnsFalse() |
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{ |
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$this |
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->forAll( |
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$this->value(), |
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$this->value(), |
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) |
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->then(function($initial, $nothing) { |
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$maybe = Maybe::just($initial)->filter(function($value) use ($initial) { |
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$this->assertSame($initial, $value); |
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return false; |
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}); |
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$this->assertInstanceOf(Maybe::class, $maybe); |
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$this->assertSame( |
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$nothing, |
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$maybe->match( |
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static fn($value) => $value, |
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static fn() => $nothing, |
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), |
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); |
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}); |
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} |
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public function testAllMapKeepValuesOrder() |
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{ |
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$this |
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->forAll(Set\Sequence::of( |
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$this->value(), |
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Set\Integers::between(1, 5), |
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)) |
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->then(function($expected) { |
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$maybes = \array_map( |
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static fn($value) => Maybe::just($value), |
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$expected, |
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); |
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$comprehension = Maybe::all(...$maybes); |
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$this->assertInstanceOf(Maybe\Comprehension::class, $comprehension); |
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$maybe = $comprehension->map(function(...$args) use ($expected) { |
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$this->assertSame($expected, $args); |
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return $args[0]; |
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}); |
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$this->assertInstanceOf(Maybe::class, $maybe); |
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}); |
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} |
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public function testAllFlatMapKeepValuesOrder() |
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{ |
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$this |
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->forAll(Set\Sequence::of( |
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$this->value(), |
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Set\Integers::between(1, 5), |
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)) |
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->then(function($expected) { |
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$maybes = \array_map( |
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static fn($value) => Maybe::just($value), |
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$expected, |
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); |
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$comprehension = Maybe::all(...$maybes); |
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$this->assertInstanceOf(Maybe\Comprehension::class, $comprehension); |
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$maybe = $comprehension->flatMap(function(...$args) use ($expected) { |
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$this->assertSame($expected, $args); |
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return Maybe::just($args[0]); |
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}); |
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$this->assertInstanceOf(Maybe::class, $maybe); |
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}); |
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} |
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312
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public function testAllMapResult() |
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{ |
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314
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$this |
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315
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->forAll( |
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Set\Sequence::of( |
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Set\Decorate::immutable( |
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static fn($value) => Maybe::just($value), |
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$this->value(), |
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320
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), |
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321
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Set\Integers::between(1, 5), |
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322
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), |
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323
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$this->value(), |
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324
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) |
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325
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->then(function($maybes, $expected) { |
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$comprehension = Maybe::all(...$maybes); |
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327
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328
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$this->assertInstanceOf(Maybe\Comprehension::class, $comprehension); |
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$maybe = $comprehension->map(static fn(...$args) => $expected); |
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$this->assertSame($expected, $maybe->match( |
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static fn($value) => $value, |
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332
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static fn() => null, |
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333
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)); |
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334
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}); |
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335
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} |
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336
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337
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public function testAllFlatMapResult() |
|
338
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{ |
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339
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$this |
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340
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->forAll( |
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341
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Set\Sequence::of( |
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342
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Set\Decorate::immutable( |
|
343
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static fn($value) => Maybe::just($value), |
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344
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$this->value(), |
|
345
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|
|
), |
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346
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|
Set\Integers::between(1, 5), |
|
347
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|
|
), |
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348
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|
|
new Set\Either( |
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349
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|
|
Set\Elements::of(Maybe::nothing()), |
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350
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|
|
Set\Decorate::immutable( |
|
351
|
|
|
static fn($value) => Maybe::just($value), |
|
352
|
|
|
$this->value(), |
|
353
|
|
|
), |
|
354
|
|
|
), |
|
355
|
|
|
) |
|
356
|
|
|
->then(function($maybes, $expected) { |
|
357
|
|
|
$comprehension = Maybe::all(...$maybes); |
|
358
|
|
|
|
|
359
|
|
|
$this->assertInstanceOf(Maybe\Comprehension::class, $comprehension); |
|
360
|
|
|
$maybe = $comprehension->flatMap(static fn(...$args) => $expected); |
|
|
|
|
|
|
361
|
|
|
$this->assertSame($expected, $maybe); |
|
362
|
|
|
}); |
|
363
|
|
|
} |
|
364
|
|
|
|
|
365
|
|
|
public function testAllMapNotCalledWhenOneNothingIsPresent() |
|
366
|
|
|
{ |
|
367
|
|
|
$this |
|
368
|
|
|
->forAll(Set\Sequence::of( |
|
369
|
|
|
Set\Decorate::immutable( |
|
370
|
|
|
static fn($value) => Maybe::just($value), |
|
371
|
|
|
$this->value(), |
|
372
|
|
|
), |
|
373
|
|
|
Set\Integers::between(1, 5), |
|
374
|
|
|
)) |
|
375
|
|
|
->then(function($maybes) { |
|
376
|
|
|
$maybes[] = Maybe::nothing(); |
|
377
|
|
|
$comprehension = Maybe::all(...$maybes); |
|
378
|
|
|
|
|
379
|
|
|
$this->assertInstanceOf(Maybe\Comprehension::class, $comprehension); |
|
380
|
|
|
$called = false; |
|
381
|
|
|
$comprehension->map(static function(...$args) use (&$called) { |
|
382
|
|
|
$called = true; |
|
383
|
|
|
|
|
384
|
|
|
return $args[0]; |
|
385
|
|
|
}); |
|
386
|
|
|
$this->assertFalse($called); |
|
387
|
|
|
}); |
|
388
|
|
|
} |
|
389
|
|
|
|
|
390
|
|
|
public function testAllFlatMapNotCalledWhenOneNothingIsPresent() |
|
391
|
|
|
{ |
|
392
|
|
|
$this |
|
393
|
|
|
->forAll(Set\Sequence::of( |
|
394
|
|
|
Set\Decorate::immutable( |
|
395
|
|
|
static fn($value) => Maybe::just($value), |
|
396
|
|
|
$this->value(), |
|
397
|
|
|
), |
|
398
|
|
|
Set\Integers::between(1, 5), |
|
399
|
|
|
)) |
|
400
|
|
|
->then(function($maybes) { |
|
401
|
|
|
$maybes[] = Maybe::nothing(); |
|
402
|
|
|
$comprehension = Maybe::all(...$maybes); |
|
403
|
|
|
|
|
404
|
|
|
$this->assertInstanceOf(Maybe\Comprehension::class, $comprehension); |
|
405
|
|
|
$called = false; |
|
406
|
|
|
$comprehension->flatMap(static function(...$args) use (&$called) { |
|
407
|
|
|
$called = true; |
|
408
|
|
|
|
|
409
|
|
|
return Maybe::just($args[0]); |
|
410
|
|
|
}); |
|
411
|
|
|
$this->assertFalse($called); |
|
412
|
|
|
}); |
|
413
|
|
|
} |
|
414
|
|
|
|
|
415
|
|
|
private function value(): Set |
|
416
|
|
|
{ |
|
417
|
|
|
return Set\AnyType::any()->filter(static fn($value) => $value !== null); |
|
418
|
|
|
} |
|
419
|
|
|
} |
|
420
|
|
|
|
Innmind /
Immutable
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This check looks for parameters that have been defined for a function or method, but which are not used in the method body.