Allow testing this component with PHPUnit 8

Author: sebastianbergmann

.gitignore

@@ -2,4 +2,5 @@
 /composer.lock
 /vendor
 /.php_cs.cache
+/.phpunit.result.cache
 /from.txt.orig

composer.json

@@ -18,7 +18,7 @@
         "php": "^7.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.0",
+        "phpunit/phpunit": "^7.5 || ^8.0",
         "symfony/process": "^2 || ^3.3 || ^4"
     },
     "autoload": {

tests/DifferTest.php

@@ -426,24 +426,6 @@ public function provideSplitStringByLinesCases(): array
         ];
     }
 
-    public function testConstructorNull(): void
-    {
-        $this->assertAttributeInstanceOf(
-            UnifiedDiffOutputBuilder::class,
-            'outputBuilder',
-            new Differ(null)
-        );
-    }
-
-    public function testConstructorString(): void
-    {
-        $this->assertAttributeInstanceOf(
-            UnifiedDiffOutputBuilder::class,
-            'outputBuilder',
-            new Differ("--- Original\n+++ New\n")
-        );
-    }
-
     public function testConstructorInvalidArgInt(): void
     {
         $this->expectException(InvalidArgumentException::class);

tests/LongestCommonSubsequenceTest.php

@@ -190,7 +190,7 @@ public function testStrictTypeCalculate(): void
     {
         $diff = $this->implementation->calculate(['5'], ['05']);
 
-        $this->assertInternalType('array', $diff);
+        $this->assertIsArray($diff);
         $this->assertCount(0, $diff);
     }
 

tests/ParserTest.php

@@ -38,12 +38,10 @@ public function testParse(): void
 
         $diffs = $this->parser->parse($content);
 
-        $this->assertInternalType('array', $diffs);
         $this->assertContainsOnlyInstancesOf(Diff::class, $diffs);
         $this->assertCount(1, $diffs);
 
         $chunks = $diffs[0]->getChunks();
-        $this->assertInternalType('array', $chunks);
         $this->assertContainsOnlyInstancesOf(Chunk::class, $chunks);
 
         $this->assertCount(1, $chunks);
@@ -85,13 +83,11 @@ public function testParseWithRemovedLines(): void
 -B
 END;
         $diffs = $this->parser->parse($content);
-        $this->assertInternalType('array', $diffs);
         $this->assertContainsOnlyInstancesOf(Diff::class, $diffs);
         $this->assertCount(1, $diffs);
 
         $chunks = $diffs[0]->getChunks();
 
-        $this->assertInternalType('array', $chunks);
         $this->assertContainsOnlyInstancesOf(Chunk::class, $chunks);
         $this->assertCount(1, $chunks);
 
@@ -102,7 +98,6 @@ public function testParseWithRemovedLines(): void
         $this->assertSame(8, $chunk->getEndRange());
 
         $lines = $chunk->getLines();
-        $this->assertInternalType('array', $lines);
         $this->assertContainsOnlyInstancesOf(Line::class, $lines);
         $this->assertCount(2, $lines);