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<?php

namespace DBDiff\Tests\Unit;

use PHPUnit\Framework\TestCase;

use DBDiff\DB\Data\ArrayDiff;

use Diff\DiffOp\DiffOpAdd;

use Diff\DiffOp\DiffOpRemove;

/**

* Tests that ArrayDiff works correctly with plain PHP arrays

* (verifies the fix for Bug #4 where Collection objects were passed

* to array_merge).

*/

class ArrayDiffTest extends TestCase

{

protected function tearDown(): void

{

\DBDiff\Params\ParamsFactory::reset();

}

/**

* Minimal stub that mimics TableIterator but returns plain arrays.

*/

private function makeIterator(array $batches): object

{

return new class($batches) {

private array $batches;

private int $index = 0;

public function __construct(array $batches)

{

$this->batches = $batches;

}

public function hasNext(): bool

{

return $this->index < count($this->batches);

}

public function next(int $size): array

{

return $this->batches[$this->index++] ?? [];

}

};

}

public function testIdenticalDataProducesNoDiff(): void

{

$rows = [['id' => 1, 'name' => 'Alice'], ['id' => 2, 'name' => 'Bob']];

\DBDiff\Params\ParamsFactory::set(new \stdClass());

$diff = new ArrayDiff(

['id'],

$this->makeIterator([$rows]),

$this->makeIterator([$rows])

);

$result = $diff->getDiff('test_table');

$this->assertEmpty($result, 'Identical data should produce no diff');

}

public function testNewRowDetected(): void

{

$source = [['id' => 1, 'name' => 'Alice'], ['id' => 2, 'name' => 'Bob']];

$target = [['id' => 1, 'name' => 'Alice']];

\DBDiff\Params\ParamsFactory::set(new \stdClass());

$diff = new ArrayDiff(

['id'],

$this->makeIterator([$source]),

$this->makeIterator([$target])

);

$result = $diff->getDiff('test_table');

$this->assertCount(1, $result);

$this->assertInstanceOf(DiffOpAdd::class, $result[0]['diff']);

}

public function testDeletedRowDetected(): void

{

$source = [['id' => 1, 'name' => 'Alice']];

$target = [['id' => 1, 'name' => 'Alice'], ['id' => 2, 'name' => 'Bob']];

\DBDiff\Params\ParamsFactory::set(new \stdClass());

$diff = new ArrayDiff(

['id'],

$this->makeIterator([$source]),

$this->makeIterator([$target])

);

$result = $diff->getDiff('test_table');

$this->assertCount(1, $result);

$this->assertInstanceOf(DiffOpRemove::class, $result[0]['diff']);

}

public function testChangedRowDetected(): void

{

$source = [['id' => 1, 'name' => 'Alice Updated']];

$target = [['id' => 1, 'name' => 'Alice']];

\DBDiff\Params\ParamsFactory::set(new \stdClass());

$diff = new ArrayDiff(

['id'],

$this->makeIterator([$source]),

$this->makeIterator([$target])

);

$result = $diff->getDiff('test_table');

$this->assertCount(1, $result);

$this->assertIsArray($result[0]['diff']);

$this->assertArrayHasKey('name', $result[0]['diff']);

}

}