psalm/tests/EmptyTest.php

<?php
namespace Psalm\Tests;

class EmptyTest extends TestCase
{
    use Traits\FileCheckerValidCodeParseTestTrait;

    /**
     * @return array
     */
    public function providerFileCheckerValidCodeParse()
    {
        return [
            'empty' => [
                '<?php
                    $a = !empty($b) ? $b : null;',
                'assertions' => [
                    '$a' => 'mixed',
                ],
                'error_levels' => ['MixedAssignment'],
            ],
            'emptyArrayVar' => [
                '<?php
                    function a(array $in): void
                    {
                        $r = [];
                        foreach ($in as $entry) {
                            if (!empty($entry["a"])) {
                                $r[] = [];
                            }
                            if (empty($entry["a"])) {
                                $r[] = [];
                            }
                        }
                    }

                    function b(array $in): void
                    {
                        $i = 0;
                        foreach ($in as $entry) {
                            if (!empty($entry["a"])) {
                                $i--;
                            }
                            if (empty($entry["a"])) {
                                $i++;
                            }
                        }
                    }

                    function c(array $in): void
                    {
                        foreach ($in as $entry) {
                            if (!empty($entry["a"])) {}
                        }
                        foreach ($in as $entry) {
                            if (empty($entry["a"])) {}
                        }
                    }',
                'assertions' => [],
                'error_levels' => ['MixedAssignment'],
            ],
            'removeEmptyArray' => [
                '<?php
                    $arr_or_string = [];

                    if (rand(0, 1)) {
                      $arr_or_string = "hello";
                    }

                    /** @return void **/
                    function foo(string $s) {}

                    if (!empty($arr_or_string)) {
                        foo($arr_or_string);
                    }',
            ],
            'emptyArrayReconciliationThenIf' => [
                '<?php
                    /**
                     * @param string|string[] $a
                     */
                    function foo($a) : string {
                        if (is_string($a)) {
                            return $a;
                        } elseif (empty($a)) {
                            return "goodbye";
                        }

                        if (isset($a[0])) {
                            return $a[0];
                        };

                        return "not found";
                    }',
            ],
            'emptyStringReconciliationThenIf' => [
                '<?php
                    /**
                     * @param Exception|string|string[] $a
                     */
                    function foo($a) : string {
                        if (is_array($a)) {
                            return "hello";
                        } elseif (empty($a)) {
                            return "goodbye";
                        }

                        if (is_string($a)) {
                            return $a;
                        };

                        return "an exception";
                    }',
            ],
            'emptyExceptionReconciliationAfterIf' => [
                '<?php
                    /**
                     * @param Exception|null $a
                     */
                    function foo($a) : string {
                        if ($a && $a->getMessage() === "hello") {
                            return "hello";
                        } elseif (empty($a)) {
                            return "goodbye";
                        }

                        return $a->getMessage();
                    }',
            ],
            'noFalsyLeak' => [
                '<?php
                    function foo(string $s) : void {
                      if (empty($s) || $s === "hello") {}
                    }',
            ],
            'noRedundantConditionOnMixed' => [
                '<?php
                    function testarray(array $data) : void {
                        foreach ($data as $item) {
                            if (!empty($item["a"]) && !empty($item["b"]) && !empty($item["b"]["c"])) {
                                echo "Found\n";
                            }
                        }
                    }',
                'assertions' => [],
                'error_levels' => ['MixedAssignment'],
            ],
        ];
    }
}