psalm/tests/RedundantConditionTest.php

<?php
namespace Psalm\Tests;

class RedundantConditionTest extends TestCase
{
    use Traits\FileCheckerValidCodeParseTestTrait;
    use Traits\FileCheckerInvalidCodeParseTestTrait;

    /**
     * @return array
     */
    public function providerFileCheckerValidCodeParse()
    {
        return [
            'ignoreIssueAndAssign' => [
                '<?php
                    public function foo() : stdClass {
                        return new stdClass;
                    }

                    $b = null;

                    foreach ([0, 1] as $i) {
                        $a = foo();

                        if (!empty($a)) {
                            $b = $a;
                        }
                    }',
                'assertions' => [
                    '$b' => 'null|stdClass',
                ],
                'error_levels' => ['RedundantCondition'],
            ],
            'byrefNoRedundantCondition' => [
                '<?php
                    /**
                     * @param int $min ref
                     * @param int $other
                     */
                    function testmin(&$min, int $other) : void {
                        if (is_null($min)) {
                            $min = 3;
                        } elseif (!is_int($min)) {
                            $min = 5;
                        } elseif ($min < $other) {
                            $min = $other;
                        }
                    }',
            ],
        ];
    }

    /**
     * @return array
     */
    public function providerFileCheckerInvalidCodeParse()
    {
        return [
            'unnecessaryInstanceof' => [
                '<?php
                    class One {
                        public function fooFoo() {}
                    }

                    $var = new One();

                    if ($var instanceof One) {
                        $var->fooFoo();
                    }',
                'error_message' => 'RedundantCondition',
            ],
            'failedTypeResolution' => [
                '<?php
                    class A { }

                    /**
                     * @return void
                     */
                    function fooFoo(A $a) {
                        if ($a instanceof A) {
                        }
                    }',
                'error_message' => 'RedundantCondition',
            ],
            'failedTypeResolutionWithDocblock' => [
                '<?php
                    class A { }

                    /**
                     * @param  A $a
                     * @return void
                     */
                    function fooFoo(A $a) {
                        if ($a instanceof A) {
                        }
                    }',
                'error_message' => 'RedundantCondition',
            ],
            'typeResolutionFromDocblockAndInstanceof' => [
                '<?php
                    class A { }

                    /**
                     * @param  A $a
                     * @return void
                     */
                    function fooFoo($a) {
                        if ($a instanceof A) {
                            if ($a instanceof A) {
                            }
                        }
                    }',
                'error_message' => 'RedundantCondition',
            ],
            'typeResolutionRepeatingConditionWithSingleVar' => [
                '<?php
                    $a = rand(0, 10) > 5;
                    if ($a && $a) {}',
                'error_message' => 'RedundantCondition',
            ],
            'typeResolutionRepeatingConditionWithVarInMiddle' => [
                '<?php
                    $a = rand(0, 10) > 5;
                    $b = rand(0, 10) > 5;
                    if ($a && $b && $a) {}',
                'error_message' => 'RedundantCondition',
            ],
            'typeResolutionIsIntAndIsNumeric' => [
                '<?php
                    $c = rand(0, 10) > 5 ? "hello" : 3;
                    if (is_int($c) && is_numeric($c)) {}',
                'error_message' => 'RedundantCondition',
            ],
            'typeResolutionWithInstanceOfAndNotEmpty' => [
                '<?php
                    $x = rand(0, 10) > 5 ? new stdClass : null;
                    if ($x instanceof stdClass && $x) {}',
                'error_message' => 'RedundantCondition',
            ],
            'methodWithMeaninglessCheck' => [
                '<?php
                    class One {
                        /** @return void */
                        public function fooFoo() {}
                    }

                    class B {
                        /** @return void */
                        public function barBar(One $one) {
                            if (!$one) {
                                // do nothing
                            }

                            $one->fooFoo();
                        }
                    }',
                'error_message' => 'RedundantCondition',
            ],
            'SKIPPED-twoVarLogicNotNestedWithElseifNegatedInIf' => [
                '<?php
                    function foo(?string $a, ?string $b) : ?string {
                        if ($a) {
                            $a = null;
                        } elseif ($b) {
                            // do nothing here
                        } else {
                            return "bad";
                        }

                        if (!$a) return $b;
                        return $a;
                    }',
                'error_message' => 'RedundantCondition',
            ],
        ];
    }
}