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<?php |
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use Litipk\BigNumbers\Decimal as Decimal; |
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use Litipk\BigNumbers\DecimalConstants as DecimalConstants; |
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use Litipk\BigNumbers\Errors\NotImplementedError; |
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use PHPUnit\Framework\TestCase; |
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8
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date_default_timezone_set('UTC'); |
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10
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class DecimalPowTest extends TestCase |
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{ |
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public function testZeroPositive() |
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{ |
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$zero = Decimal::fromInteger(0); |
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$two = Decimal::fromInteger(2); |
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$this->assertTrue($zero->pow($two)->isZero()); |
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} |
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/** |
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* TODO : Split tests, change idiom to take exception message into account. |
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*/ |
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public function testZeroNoPositive() |
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{ |
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$zero = DecimalConstants::Zero(); |
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$nTwo = Decimal::fromInteger(-2); |
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$catched = false; |
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try { |
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$zero->pow($nTwo); |
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} catch (\DomainException $e) { |
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$catched = true; |
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} |
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$this->assertTrue($catched); |
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$catched = false; |
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try { |
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$zero->pow($zero); |
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} catch (\DomainException $e) { |
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$catched = true; |
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} |
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$this->assertTrue($catched); |
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} |
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public function testNoZeroZero() |
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{ |
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$zero = DecimalConstants::Zero(); |
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$one = DecimalConstants::One(); |
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$nTwo = Decimal::fromInteger(-2); |
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$pTwo = Decimal::fromInteger(2); |
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$this->assertTrue($nTwo->pow($zero)->equals($one)); |
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$this->assertTrue($pTwo->pow($zero)->equals($one)); |
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} |
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public function testLittleIntegerInteger() |
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{ |
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$two = Decimal::fromInteger(2); |
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$three = Decimal::fromInteger(3); |
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$four = Decimal::fromInteger(4); |
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$eight = Decimal::fromInteger(8); |
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$nine = Decimal::fromInteger(9); |
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$twentyseven = Decimal::fromInteger(27); |
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$this->assertTrue($two->pow($two)->equals($four)); |
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$this->assertTrue($two->pow($three)->equals($eight)); |
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$this->assertTrue($three->pow($two)->equals($nine)); |
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$this->assertTrue($three->pow($three)->equals($twentyseven)); |
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} |
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public function testLittlePositiveSquareRoot() |
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{ |
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$half = Decimal::fromString('0.5'); |
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$two = Decimal::fromInteger(2); |
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$three = Decimal::fromInteger(3); |
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$four = Decimal::fromInteger(4); |
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$nine = Decimal::fromInteger(9); |
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$this->assertTrue($four->pow($half)->equals($two)); |
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$this->assertTrue($nine->pow($half)->equals($three)); |
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} |
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public function testBigPositiveSquareRoot() |
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{ |
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$half = Decimal::fromString('0.5'); |
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$bignum1 = Decimal::fromString('922337203685477580700'); |
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90
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$this->assertTrue($bignum1->pow($half, 6)->equals($bignum1->sqrt(6))); |
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} |
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/** |
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* TODO : Incorrect test! (The exception type should be changed, and the "idiom"!) |
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95
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*/ |
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96
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public function testNegativeSquareRoot() |
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{ |
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$half = Decimal::fromString('0.5'); |
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$nThree = Decimal::fromInteger(-3); |
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$catched = false; |
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try { |
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$nThree->pow($half); |
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} catch (NotImplementedError $e) { |
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$catched = true; |
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} |
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$this->assertTrue($catched); |
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} |
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110
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public function testPositiveWithNegativeExponent() |
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{ |
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$pFive = Decimal::fromInteger(5); |
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114
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$this->assertTrue( |
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$pFive->pow(Decimal::fromInteger(-1))->equals(Decimal::fromString("0.2")), |
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"The answer must be 0.2, but was " . $pFive->pow(Decimal::fromInteger(-1)) |
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); |
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$this->assertTrue( |
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$pFive->pow(Decimal::fromInteger(-2))->equals(Decimal::fromString("0.04")), |
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"The answer must be 0.04, but was " . $pFive->pow(Decimal::fromInteger(-2)) |
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); |
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$this->assertTrue( |
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$pFive->pow(Decimal::fromInteger(-3))->equals(Decimal::fromString("0.008")), |
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"The answer must be 0.008, but was " . $pFive->pow(Decimal::fromInteger(-3)) |
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125
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); |
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$this->assertTrue( |
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$pFive->pow(Decimal::fromInteger(-4))->equals(Decimal::fromString("0.0016")), |
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"The answer must be 0.0016, but was " . $pFive->pow(Decimal::fromInteger(-4)) |
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); |
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131
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$this->assertTrue( |
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$pFive->pow(Decimal::fromFloat(-4.5))->equals(Decimal::fromString("0.0007155417527999")), |
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"The answer must be 0.0007155417527999, but was " . $pFive->pow(Decimal::fromFloat(-4.5)) |
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); |
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} |
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136
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137
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public function testNegativeWithPositiveExponent() |
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138
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{ |
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$nFive = Decimal::fromInteger(-5); |
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140
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141
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$this->assertTrue($nFive->pow(DecimalConstants::One())->equals($nFive)); |
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$this->assertTrue($nFive->pow(Decimal::fromInteger(2))->equals(Decimal::fromInteger(25))); |
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$this->assertTrue($nFive->pow(Decimal::fromInteger(3))->equals(Decimal::fromInteger(-125))); |
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} |
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145
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146
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public function testNegativeWithNegativeExponent() |
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147
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{ |
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148
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$nFive = Decimal::fromInteger(-5); |
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149
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150
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$this->assertTrue( |
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$nFive->pow(Decimal::fromInteger(-1))->equals(Decimal::fromString("-0.2")), |
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"The answer must be -0.2, but was " . $nFive->pow(Decimal::fromInteger(-1)) |
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); |
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$this->assertTrue($nFive->pow(Decimal::fromInteger(-2))->equals(Decimal::fromString("0.04"))); |
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$this->assertTrue($nFive->pow(Decimal::fromInteger(-3))->equals(Decimal::fromString("-0.008"))); |
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} |
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} |
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Litipk /
php-bignumbers
