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<?php declare(strict_types=1);
/*
 * This file is part of sebastian/diff.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace SebastianBergmann\Diff;

use PHPUnit\Framework\TestCase;
use SebastianBergmann\Diff\Output\AbstractChunkOutputBuilder;
use SebastianBergmann\Diff\Output\DiffOnlyOutputBuilder;
use SebastianBergmann\Diff\Output\UnifiedDiffOutputBuilder;

/**
 * @covers SebastianBergmann\Diff\Differ
 * @covers SebastianBergmann\Diff\Output\AbstractChunkOutputBuilder
 * @covers SebastianBergmann\Diff\Output\DiffOnlyOutputBuilder
 * @covers SebastianBergmann\Diff\Output\UnifiedDiffOutputBuilder
 *
 * @uses SebastianBergmann\Diff\MemoryEfficientLongestCommonSubsequenceCalculator
 * @uses SebastianBergmann\Diff\TimeEfficientLongestCommonSubsequenceCalculator
 * @uses SebastianBergmann\Diff\Chunk
 * @uses SebastianBergmann\Diff\Diff
 * @uses SebastianBergmann\Diff\Line
 * @uses SebastianBergmann\Diff\Parser
 */
final class DifferTest extends TestCase
{
    const WARNING = 3;
    const REMOVED = 2;
    const ADDED   = 1;
    const OLD     = 0;

    /**
     * @var Differ
     */
    private $differ;

    protected function setUp()
    {
        $this->differ = new Differ;
    }

    /**
     * @param array        $expected
     * @param string|array $from
     * @param string|array $to
     * @dataProvider arrayProvider
     */
    public function testArrayRepresentationOfDiffCanBeRenderedUsingTimeEfficientLcsImplementation(array $expected, $from, $to)
    {
        $this->assertSame($expected, $this->differ->diffToArray($from, $to, new TimeEfficientLongestCommonSubsequenceCalculator));
    }

    /**
     * @param string $expected
     * @param string $from
     * @param string $to
     * @dataProvider textProvider
     */
    public function testTextRepresentationOfDiffCanBeRenderedUsingTimeEfficientLcsImplementation(string $expected, string $from, string $to)
    {
        $this->assertSame($expected, $this->differ->diff($from, $to, new TimeEfficientLongestCommonSubsequenceCalculator));
    }

    /**
     * @param array        $expected
     * @param string|array $from
     * @param string|array $to
     * @dataProvider arrayProvider
     */
    public function testArrayRepresentationOfDiffCanBeRenderedUsingMemoryEfficientLcsImplementation(array $expected, $from, $to)
    {
        $this->assertSame($expected, $this->differ->diffToArray($from, $to, new MemoryEfficientLongestCommonSubsequenceCalculator));
    }

    /**
     * @param string $expected
     * @param string $from
     * @param string $to
     * @dataProvider textProvider
     */
    public function testTextRepresentationOfDiffCanBeRenderedUsingMemoryEfficientLcsImplementation(string $expected, string $from, string $to)
    {
        $this->assertSame($expected, $this->differ->diff($from, $to, new MemoryEfficientLongestCommonSubsequenceCalculator));
    }

    /**
     * @param string $expected
     * @param string $from
     * @param string $to
     * @param string $header
     * @dataProvider headerProvider
     */
    public function testCustomHeaderCanBeUsed(string $expected, string $from, string $to, string $header)
    {
        $differ = new Differ(new UnifiedDiffOutputBuilder($header));

        $this->assertSame(
            $expected,
            $differ->diff($from, $to)
        );
    }

    public function headerProvider()
    {
        return [
            [
                "CUSTOM HEADER\n@@ @@\n-a\n+b\n",
                'a',
                'b',
                'CUSTOM HEADER'
            ],
            [
                "CUSTOM HEADER\n@@ @@\n-a\n+b\n",
                'a',
                'b',
                "CUSTOM HEADER\n"
            ],
            [
                "CUSTOM HEADER\n\n@@ @@\n-a\n+b\n",
                'a',
                'b',
                "CUSTOM HEADER\n\n"
            ],
            [
                "@@ @@\n-a\n+b\n",
                'a',
                'b',
                ''
            ],
        ];
    }

    public function testTypesOtherThanArrayAndStringCanBePassed()
    {
        $this->assertSame(
            "--- Original\n+++ New\n@@ @@\n-1\n+2\n",
            $this->differ->diff(1, 2)
        );
    }

    /**
     * @param string $diff
     * @param Diff[] $expected
     * @dataProvider diffProvider
     */
    public function testParser(string $diff, array $expected)
    {
        $parser = new Parser;
        $result = $parser->parse($diff);

        $this->assertEquals($expected, $result);
    }

    public function arrayProvider(): array
    {
        return [
            [
                [
                    ['a', self::REMOVED],
                    ['b', self::ADDED]
                ],
                'a',
                'b'
            ],
            [
                [
                    ['ba', self::REMOVED],
                    ['bc', self::ADDED]
                ],
                'ba',
                'bc'
            ],
            [
                [
                    ['ab', self::REMOVED],
                    ['cb', self::ADDED]
                ],
                'ab',
                'cb'
            ],
            [
                [
                    ['abc', self::REMOVED],
                    ['adc', self::ADDED]
                ],
                'abc',
                'adc'
            ],
            [
                [
                    ['ab', self::REMOVED],
                    ['abc', self::ADDED]
                ],
                'ab',
                'abc'
            ],
            [
                [
                    ['bc', self::REMOVED],
                    ['abc', self::ADDED]
                ],
                'bc',
                'abc'
            ],
            [
                [
                    ['abc', self::REMOVED],
                    ['abbc', self::ADDED]
                ],
                'abc',
                'abbc'
            ],
            [
                [
                    ['abcdde', self::REMOVED],
                    ['abcde', self::ADDED]
                ],
                'abcdde',
                'abcde'
            ],
            'same start' => [
                [
                    [17, self::OLD],
                    ['b', self::REMOVED],
                    ['d', self::ADDED],
                ],
                [30 => 17, 'a' => 'b'],
                [30 => 17, 'c' => 'd'],
            ],
            'same end' => [
                [
                    [1, self::REMOVED],
                    [2, self::ADDED],
                    ['b', self::OLD],
                ],
                [1 => 1, 'a' => 'b'],
                [1 => 2, 'a' => 'b'],
            ],
            'same start (2), same end (1)' => [
                [
                    [17, self::OLD],
                    [2, self::OLD],
                    [4, self::REMOVED],
                    ['a', self::ADDED],
                    [5, self::ADDED],
                    ['x', self::OLD],
                ],
                [30 => 17, 1 => 2, 2 => 4, 'z' => 'x'],
                [30 => 17, 1 => 2, 3 => 'a', 2 => 5, 'z' => 'x'],
            ],
            'same' => [
                [
                    ['x', self::OLD],
                ],
                ['z' => 'x'],
                ['z' => 'x'],
            ],
            'diff' => [
                [
                    ['y', self::REMOVED],
                    ['x', self::ADDED],
                ],
                ['x' => 'y'],
                ['z' => 'x'],
            ],
            'diff 2' => [
                [
                    ['y', self::REMOVED],
                    ['b', self::REMOVED],
                    ['x', self::ADDED],
                    ['d', self::ADDED],
                ],
                ['x' => 'y', 'a' => 'b'],
                ['z' => 'x', 'c' => 'd'],
            ],
            'test line diff detection' => [
                [
                    [
                        "#Warning: Strings contain different line endings!\n",
                        self::WARNING,
                    ],
                    [
                        "<?php\r\n",
                        self::REMOVED,
                    ],
                    [
                        "<?php\n",
                        self::ADDED,
                    ],
                ],
                "<?php\r\n",
                "<?php\n",
            ],
            'test line diff detection in array input' => [
                [
                    [
                        "#Warning: Strings contain different line endings!\n",
                        self::WARNING,
                    ],
                    [
                        "<?php\r\n",
                        self::REMOVED,
                    ],
                    [
                        "<?php\n",
                        self::ADDED,
                    ],
                ],
                ["<?php\r\n"],
                ["<?php\n"],
            ],
        ];
    }

    public function textProvider(): array
    {
        return [
            [
                "--- Original\n+++ New\n@@ @@\n-a\n+b\n",
                'a',
                'b'
            ],
            [
                "--- Original\n+++ New\n@@ @@\n-ba\n+bc\n",
                'ba',
                'bc'
            ],
            [
                "--- Original\n+++ New\n@@ @@\n-ab\n+cb\n",
                'ab',
                'cb'
            ],
            [
                "--- Original\n+++ New\n@@ @@\n-abc\n+adc\n",
                'abc',
                'adc'
            ],
            [
                "--- Original\n+++ New\n@@ @@\n-ab\n+abc\n",
                'ab',
                'abc'
            ],
            [
                "--- Original\n+++ New\n@@ @@\n-bc\n+abc\n",
                'bc',
                'abc'
            ],
            [
                "--- Original\n+++ New\n@@ @@\n-abc\n+abbc\n",
                'abc',
                'abbc'
            ],
            [
                "--- Original\n+++ New\n@@ @@\n-abcdde\n+abcde\n",
                'abcdde',
                'abcde'
            ],
            [
                "--- Original\n+++ New\n@@ @@\n-A\n+A1\n",
                "A\nB",
                "A1\nB",
            ],
            [
                <<<EOF
--- Original
+++ New
@@ @@
 a
-b
+p
@@ @@
-j
+w

EOF
            ,
                "a\nb\nc\nd\ne\nf\ng\nh\ni\nj\nk",
                "a\np\nc\nd\ne\nf\ng\nh\ni\nw\nk",
            ],
            [
                <<<EOF
--- Original
+++ New
@@ @@
-A
+B

EOF
            ,
                "A\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1",
                "B\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1",
            ],
            [
                "--- Original\n+++ New\n@@ @@\n #Warning: Strings contain different line endings!\n-<?php\r\n+<?php\n",
                "<?php\r\nA\n",
                "<?php\nA\n",
            ],
            [
                "--- Original\n+++ New\n@@ @@\n #Warning: Strings contain different line endings!\n-a\r\n+\n+c\r",
                "a\r\n",
                "\nc\r",
            ],
        ];
    }

    public function diffProvider(): array
    {
        $serialized_arr = <<<EOL
a:1:{i:0;O:27:"SebastianBergmann\Diff\Diff":3:{s:33:"SebastianBergmann\Diff\Difffrom";s:7:"old.txt";s:31:"SebastianBergmann\Diff\Diffto";s:7:"new.txt";s:35:"SebastianBergmann\Diff\Diffchunks";a:3:{i:0;O:28:"SebastianBergmann\Diff\Chunk":5:{s:35:"SebastianBergmann\Diff\Chunkstart";i:1;s:40:"SebastianBergmann\Diff\ChunkstartRange";i:3;s:33:"SebastianBergmann\Diff\Chunkend";i:1;s:38:"SebastianBergmann\Diff\ChunkendRange";i:4;s:35:"SebastianBergmann\Diff\Chunklines";a:4:{i:0;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:1;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"2222111";}i:1;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"1111111";}i:2;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"1111111";}i:3;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"1111111";}}}i:1;O:28:"SebastianBergmann\Diff\Chunk":5:{s:35:"SebastianBergmann\Diff\Chunkstart";i:5;s:40:"SebastianBergmann\Diff\ChunkstartRange";i:10;s:33:"SebastianBergmann\Diff\Chunkend";i:6;s:38:"SebastianBergmann\Diff\ChunkendRange";i:8;s:35:"SebastianBergmann\Diff\Chunklines";a:11:{i:0;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"1111111";}i:1;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"1111111";}i:2;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"1111111";}i:3;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:8:"+1121211";}i:4;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"1111111";}i:5;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:8:"-1111111";}i:6;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:8:"-1111111";}i:7;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:8:"-2222222";}i:8;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"2222222";}i:9;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"2222222";}i:10;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"2222222";}}}i:2;O:28:"SebastianBergmann\Diff\Chunk":5:{s:35:"SebastianBergmann\Diff\Chunkstart";i:17;s:40:"SebastianBergmann\Diff\ChunkstartRange";i:5;s:33:"SebastianBergmann\Diff\Chunkend";i:16;s:38:"SebastianBergmann\Diff\ChunkendRange";i:6;s:35:"SebastianBergmann\Diff\Chunklines";a:6:{i:0;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"2222222";}i:1;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"2222222";}i:2;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"2222222";}i:3;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:8:"+2122212";}i:4;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"2222222";}i:5;O:27:"SebastianBergmann\Diff\Line":2:{s:33:"SebastianBergmann\Diff\Linetype";i:3;s:36:"SebastianBergmann\Diff\Linecontent";s:7:"2222222";}}}}}}
EOL;

        return [
            [
                "--- old.txt	2014-11-04 08:51:02.661868729 +0300\n+++ new.txt	2014-11-04 08:51:02.665868730 +0300\n@@ -1,3 +1,4 @@\n+2222111\n 1111111\n 1111111\n 1111111\n@@ -5,10 +6,8 @@\n 1111111\n 1111111\n 1111111\n +1121211\n 1111111\n -1111111\n -1111111\n -2222222\n 2222222\n 2222222\n 2222222\n@@ -17,5 +16,6 @@\n 2222222\n 2222222\n 2222222\n +2122212\n 2222222\n 2222222\n",
                \unserialize($serialized_arr)
            ]
        ];
    }

    /**
     * @param string $expected
     * @param string $from
     * @param string $to
     * @param string $header
     * @dataProvider textForNoNonDiffLinesProvider
     */
    public function testDiffDoNotShowNonDiffLines(string $expected, string $from, string $to, string $header = '')
    {
        $differ = new Differ(new DiffOnlyOutputBuilder($header));

        $this->assertSame($expected, $differ->diff($from, $to));
    }

    public function textForNoNonDiffLinesProvider(): array
    {
        return [
            [
                " #Warning: Strings contain different line endings!\n-A\r\n+B\n",
                "A\r\n",
                "B\n",
            ],
            [
                "-A\n+B\n",
                "\nA",
                "\nB"
            ],
            [
                '',
                'a',
                'a'
            ],
            [
                "-A\n+C\n",
                "A\n\n\nB",
                "C\n\n\nB",
            ],
            [
                "header\n",
                'a',
                'a',
                'header'
            ],
            [
                "header\n",
                'a',
                'a',
                "header\n"
            ],
        ];
    }

    public function testDiffToArrayInvalidFromType()
    {
        $this->expectException('\InvalidArgumentException');
        $this->expectExceptionMessageRegExp('#^"from" must be an array or string\.$#');

        $this->differ->diffToArray(null, '');
    }

    public function testDiffInvalidToType()
    {
        $this->expectException('\InvalidArgumentException');
        $this->expectExceptionMessageRegExp('#^"to" must be an array or string\.$#');

        $this->differ->diffToArray('', new \stdClass);
    }

    /**
     * @param array  $expected
     * @param string $from
     * @param string $to
     * @param int    $lineThreshold
     * @dataProvider provideGetCommonChunks
     */
    public function testGetCommonChunks(array $expected, string $from, string $to, int $lineThreshold = 5)
    {
        $output = new class extends AbstractChunkOutputBuilder {
            public function getDiff(array $diff): string
            {
                return '';
            }

            public function getChunks(array $diff, $lineThreshold)
            {
                return $this->getCommonChunks($diff, $lineThreshold);
            }
        };

        $this->assertSame(
            $expected,
            $output->getChunks($this->differ->diffToArray($from, $to), $lineThreshold)
        );
    }

    public function provideGetCommonChunks(): array
    {
        return[
            'same (with default threshold)' => [
                [],
                'A',
                'A',
            ],
            'same (threshold 0)' => [
                [0 => 0],
                'A',
                'A',
                0,
            ],
            'empty' => [
                [],
                '',
                '',
            ],
            'single line diff' => [
                [],
                'A',
                'B',
            ],
            'below threshold I' => [
                [],
                "A\nX\nC",
                "A\nB\nC",
            ],
            'below threshold II' => [
                [],
                "A\n\n\n\nX\nC",
                "A\n\n\n\nB\nC",
            ],
            'below threshold III' => [
                [0 => 5],
                "A\n\n\n\n\n\nB",
                "A\n\n\n\n\n\nA",
            ],
            'same start' => [
                [0 => 5],
                "A\n\n\n\n\n\nX\nC",
                "A\n\n\n\n\n\nB\nC",
            ],
            'same start long' => [
                [0 => 13],
                "\n\n\n\n\n\n\n\n\n\n\n\n\n\nA",
                "\n\n\n\n\n\n\n\n\n\n\n\n\n\nB",
            ],
            'same part in between' => [
                [2 => 8],
                "A\n\n\n\n\n\n\nX\nY\nZ\n\n",
                "B\n\n\n\n\n\n\nX\nA\nZ\n\n",
            ],
            'same trailing' => [
                [2 => 14],
                "A\n\n\n\n\n\n\n\n\n\n\n\n\n\n",
                "B\n\n\n\n\n\n\n\n\n\n\n\n\n\n",
            ],
            'same part in between, same trailing' => [
                [2 => 7, 10 => 15],
                "A\n\n\n\n\n\n\nA\n\n\n\n\n\n\n",
                "B\n\n\n\n\n\n\nB\n\n\n\n\n\n\n",
            ],
            'below custom threshold I' => [
                [],
                "A\n\nB",
                "A\n\nD",
                2
            ],
            'custom threshold I' => [
                [0 => 1],
                "A\n\nB",
                "A\n\nD",
                1
            ],
            'custom threshold II' => [
                [],
                "A\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n",
                "A\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n",
                19
            ],
            [
                [3 => 9],
                "a\nb\nc\nd\ne\nf\ng\nh\ni\nj\nk",
                "a\np\nc\nd\ne\nf\ng\nh\ni\nw\nk",
            ],
            [
                [0 => 5, 8 => 13],
                "A\nA\nA\nA\nA\nA\nX\nC\nC\nC\nC\nC\nC",
                "A\nA\nA\nA\nA\nA\nB\nC\nC\nC\nC\nC\nC",
            ],
            [
                [0 => 5, 8 => 13],
                "A\nA\nA\nA\nA\nA\nX\nC\nC\nC\nC\nC\nC\nX",
                "A\nA\nA\nA\nA\nA\nB\nC\nC\nC\nC\nC\nC\nY",
            ],
        ];
    }

    /**
     * @param array  $expected
     * @param string $input
     * @dataProvider provideSplitStringByLinesCases
     */
    public function testSplitStringByLines(array $expected, string $input)
    {
        $reflection = new \ReflectionObject($this->differ);
        $method     = $reflection->getMethod('splitStringByLines');
        $method->setAccessible(true);

        $this->assertSame($expected, $method->invoke($this->differ, $input));
    }

    public function provideSplitStringByLinesCases(): array
    {
        return [
            [
                [],
                ''
            ],
            [
                ['a'],
                'a'
            ],
            [
                ["a\n"],
                "a\n"
            ],
            [
                ["a\r"],
                "a\r"
            ],
            [
                ["a\r\n"],
                "a\r\n"
            ],
            [
                ["\n"],
                "\n"
            ],
            [
                ["\r"],
                "\r"
            ],
            [
                ["\r\n"],
                "\r\n"
            ],
            [
                [
                    "A\n",
                    "B\n",
                    "\n",
                    "C\n"
                ],
                "A\nB\n\nC\n",
            ],
            [
                [
                    "A\r\n",
                    "B\n",
                    "\n",
                    "C\r"
                ],
                "A\r\nB\n\nC\r",
            ],
            [
                [
                    "\n",
                    "A\r\n",
                    "B\n",
                    "\n",
                    'C'
                ],
                "\nA\r\nB\n\nC",
            ],
        ];
    }

    /**
     * @param string $expected
     * @param string $from
     * @param string $to
     * @dataProvider provideDiffWithLineNumbers
     */
    public function testDiffWithLineNumbers($expected, $from, $to)
    {
        $differ = new Differ(new UnifiedDiffOutputBuilder("--- Original\n+++ New\n", true));
        $this->assertSame($expected, $differ->diff($from, $to));
    }

    public function provideDiffWithLineNumbers(): array
    {
        return [
            'diff line 1 non_patch_compat' => [
                '--- Original
+++ New
@@ -1 +1 @@
-AA
+BA
',
                'AA',
                'BA',
            ],
            'diff line +1 non_patch_compat' => [
                '--- Original
+++ New
@@ -1 +1,2 @@
-AZ
+
+B
',
                'AZ',
                "\nB",
            ],
            'diff line -1 non_patch_compat' => [
                '--- Original
+++ New
@@ -1,2 +1 @@
-
-AF
+B
',
                "\nAF",
                'B',
            ],
            'II non_patch_compat' => [
                '--- Original
+++ New
@@ -1,2 +1 @@
-
-
'
                ,
                "\n\nA\n1",
                "A\n1",
            ],
            'diff last line II - no trailing linebreak non_patch_compat' => [
                '--- Original
+++ New
@@ -8 +8 @@
-E
+B
',
                "A\n\n\n\n\n\n\nE",
                "A\n\n\n\n\n\n\nB",
            ],
            [
                "--- Original\n+++ New\n@@ -1,2 +1 @@\n \n-\n",
                "\n\n",
                "\n",
            ],
            'diff line endings non_patch_compat' => [
                "--- Original\n+++ New\n@@ -1 +1 @@\n #Warning: Strings contain different line endings!\n-<?php\r\n+<?php\n",
                "<?php\r\n",
                "<?php\n",
            ],
            'same non_patch_compat' => [
                '--- Original
+++ New
',
                "AT\n",
                "AT\n",
            ],
            [
                '--- Original
+++ New
@@ -1 +1 @@
-b
+a
',
                "b\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n",
                "a\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n"
            ],
            'diff line @1' => [
                '--- Original
+++ New
@@ -1,2 +1,2 @@
 ' . '
-AG
+B
',
                "\nAG\n",
                "\nB\n",
            ],
            'same multiple lines' => [
                '--- Original
+++ New
@@ -1,3 +1,3 @@
 ' . '
 ' . '
-V
+B
'

                ,
                "\n\nV\nC213",
                "\n\nB\nC213",
            ],
            'diff last line I' => [
                '--- Original
+++ New
@@ -8 +8 @@
-E
+B
',
                "A\n\n\n\n\n\n\nE\n",
                "A\n\n\n\n\n\n\nB\n",
            ],
            'diff line middle' => [
                '--- Original
+++ New
@@ -8 +8 @@
-X
+Z
',
                "A\n\n\n\n\n\n\nX\n\n\n\n\n\n\nAY",
                "A\n\n\n\n\n\n\nZ\n\n\n\n\n\n\nAY",
            ],
            'diff last line III' => [
                '--- Original
+++ New
@@ -15 +15 @@
-A
+B
',
                "A\n\n\n\n\n\n\nA\n\n\n\n\n\n\nA\n",
                "A\n\n\n\n\n\n\nA\n\n\n\n\n\n\nB\n",
            ],
            [
                '--- Original
+++ New
@@ -1,7 +1,7 @@
 A
-B
+B1
 D
 E
 EE
 F
-G
+G1
',
                "A\nB\nD\nE\nEE\nF\nG\nH",
                "A\nB1\nD\nE\nEE\nF\nG1\nH",
            ],
            [
                '--- Original
+++ New
@@ -1 +1,2 @@
 Z
+
@@ -10 +11 @@
-i
+x
',
                'Z
a
b
c
d
e
f
g
h
i
j',
                'Z

a
b
c
d
e
f
g
h
x
j'
            ],
            [
                '--- Original
+++ New
@@ -1,5 +1,3 @@
-
-a
+b
 A
-a
-
+b
',
                "\na\nA\na\n\n\nA",
                "b\nA\nb\n\nA"
            ],
            [
                <<<EOF
--- Original
+++ New
@@ -1,4 +1,2 @@
-
-
 a
-b
+p
@@ -12 +10 @@
-j
+w

EOF
                ,
                "\n\na\nb\nc\nd\ne\nf\ng\nh\ni\nj\nk",
                "a\np\nc\nd\ne\nf\ng\nh\ni\nw\nk",
            ],
            [
                '--- Original
+++ New
@@ -11 +11 @@
-A
+C
',
                "E\n\n\n\n\nB\n\n\n\n\nA\n\n\n\n\n\n\n\n\nD1",
                "E\n\n\n\n\nB\n\n\n\n\nC\n\n\n\n\n\n\n\n\nD1",
            ],
            [
                '--- Original
+++ New
@@ -8 +8 @@
-Z
+U
@@ -15 +15 @@
-X
+V
@@ -22 +22 @@
-Y
+W
@@ -29 +29 @@
-W
+X
@@ -36 +36 @@
-V
+Y
@@ -43 +43 @@
-U
+Z
',
                "\n\n\n\n\n\n\nZ\n\n\n\n\n\n\nX\n\n\n\n\n\n\nY\n\n\n\n\n\n\nW\n\n\n\n\n\n\nV\n\n\n\n\n\n\nU\n",
                "\n\n\n\n\n\n\nU\n\n\n\n\n\n\nV\n\n\n\n\n\n\nW\n\n\n\n\n\n\nX\n\n\n\n\n\n\nY\n\n\n\n\n\n\nZ\n"
            ],
            [
                <<<EOF
--- Original
+++ New
@@ -1,2 +1,2 @@
 a
-b
+p
@@ -10 +10 @@
-j
+w

EOF
            ,
                "a\nb\nc\nd\ne\nf\ng\nh\ni\nj\nk",
                "a\np\nc\nd\ne\nf\ng\nh\ni\nw\nk",
            ],
            [
                <<<EOF
--- Original
+++ New
@@ -1 +1 @@
-A
+B

EOF
            ,
                "A\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1",
                "B\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1\n1",
            ],
            [
                "--- Original\n+++ New\n@@ -7 +7 @@\n-X\n+B\n",
                "A\nA\nA\nA\nA\nA\nX\nC\nC\nC\nC\nC\nC",
                "A\nA\nA\nA\nA\nA\nB\nC\nC\nC\nC\nC\nC",
            ],
        ];
    }

    public function testConstructorNull()
    {
        $this->assertAttributeInstanceOf(
            UnifiedDiffOutputBuilder::class,
            'outputBuilder',
            new Differ(null)
        );
    }

    public function testConstructorString()
    {
        $this->assertAttributeInstanceOf(
            UnifiedDiffOutputBuilder::class,
            'outputBuilder',
            new Differ("--- Original\n+++ New\n")
        );
    }

    public function testConstructorInvalidArgInt()
    {
        $this->expectException(InvalidArgumentException::class);
        $this->expectExceptionMessageRegExp('/^Expected builder to be an instance of DiffOutputBuilderInterface, <null> or a string, got integer "1"\.$/');

        new Differ(1);
    }

    public function testConstructorInvalidArgObject()
    {
        $this->expectException(InvalidArgumentException::class);
        $this->expectExceptionMessageRegExp('/^Expected builder to be an instance of DiffOutputBuilderInterface, <null> or a string, got instance of "SplFileInfo"\.$/');

        new Differ(new \SplFileInfo(__FILE__));
    }
}

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