symfony
diff --git a/‎src/Symfony/Component/Mime/MimeTypes.php
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+1Lines changed: 1 addition & 0 deletions b/‎src/Symfony/Component/Mime/MimeTypes.php
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+1Lines changed: 1 addition & 0 deletions
diff --git a/‎src/Symfony/Component/Mime/Tests/Fixtures/mimetypes/abc.csv
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+3Lines changed: 3 additions & 0 deletions b/‎src/Symfony/Component/Mime/Tests/Fixtures/mimetypes/abc.csv
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+3Lines changed: 3 additions & 0 deletions
diff --git a/‎src/Symfony/Component/Mime/Tests/MimeTypesTest.php
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+14Lines changed: 14 additions & 0 deletions b/‎src/Symfony/Component/Mime/Tests/MimeTypesTest.php
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+14Lines changed: 14 additions & 0 deletions
@@ -166,6 +166,7 @@ public function guessMimeType(string $path): ?string
         'application/cdmi-queue' => ['cdmiq'],
         'application/cdr' => ['cdr'],
         'application/coreldraw' => ['cdr'],
+        'application/csv' => ['csv'],
         'application/cu-seeme' => ['cu'],
         'application/davmount+xml' => ['davmount'],
         'application/dbase' => ['dbf'],
 
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@@ -73,4 +73,18 @@ public function testCustomMimeTypes()
         $this->assertContains('text/baz', $mt->getMimeTypes('foo'));
         $this->assertSame(['foo', 'moof'], $mt->getExtensions('text/baz'));
     }
+
+    /**
+     * PHP 8 detects .csv files as "application/csv" while PHP 7 returns "text/plain".
+     *
+     * @requires PHP 8
+     */
+    public function testCsvExtension()
+    {
+        $mt = new MimeTypes();
+
+        $mime = $mt->guessMimeType(__DIR__.'/Fixtures/mimetypes/abc.csv');
+        $this->assertSame('application/csv', $mime);
+        $this->assertSame(['csv'], $mt->getExtensions($mime));
+    }
 }
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