PeCoTa-PHP/tests/FourSumTest.php at master · juque/PeCoTa-PHP · GitHub

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<?php

use PHPUnit\Framework\TestCase;

class FourSumTest extends TestCase
{
    private FourSum $fourSum;

    protected function setUp(): void
    {
        $this->fourSum = new FourSum();
    }

    /**
     * Test case with a valid solution.
     */
    public function testBasicCase()
    {
        $nums = [1, 0, -1, 0, -2, 2];
        $target = 0;
        $expected = [
                [-2, -1, 1, 2],
                [-2, 0, 0, 2],
                [-1, 0, 0, 1],
        ];
        $result = $this->fourSum->fourSum($nums, $target);
        $this->assertEquals($expected, $result);
    }

    /**
     * Test case with no solution.
     */
    public function testNoSolution()
    {
        $nums = [1, 2, 3, 4];
        $target = 11; // No hay combinación que sume 11
        $expected = [];
        $result = $this->fourSum->fourSum($nums, $target);
        $this->assertEquals($expected, $result);
    }

    /**
     * Test case with multiple solutions.
     */
    public function testMultipleSolutions()
    {
        $nums = [2, 2, 2, 2, 2];
        $target = 8;
        $expected = [
                [2, 2, 2, 2],
        ];
        $result = $this->fourSum->fourSum($nums, $target);
        $this->assertEquals($expected, $result);
    }

    /**
     * Test case with negative numbers.
     */
    public function testNegativeNumbers()
    {
        $nums = [-3, -2, -1, 0, 0, 1, 2, 3];
        $target = 0;
        $expected = [
            [-3, -2, 2, 3],
            [-3, -1, 1, 3],
            [-3, 0, 0, 3],
            [-3, 0, 1, 2],
            [-2, -1, 0, 3],
            [-2, -1, 1, 2],
            [-2, 0, 0, 2],
            [-1, 0, 0, 1],
        ];
        $result = $this->fourSum->fourSum($nums, $target);
        $this->assertEquals($expected, $result);
    }


    /**
     * Test case with duplicates in the array.
     */
    public function testDuplicatesInArray()
    {
        $nums = [1, 1, 1, 1, 2, 2, 2, 2];
        $target = 6;
        $expected = [
            [1, 1, 2, 2],
        ];
        $result = $this->fourSum->fourSum($nums, $target);
        $this->assertEquals($expected, $result);
    }

    /**
     * Test case with a small array (less than 4 elements).
     */
    public function testSmallArray()
    {
        $nums = [1, 2, 3];
        $target = 6;
        $expected = [];
        $result = $this->fourSum->fourSum($nums, $target);
        $this->assertEquals($expected, $result);
    }

}