diff --git a/tests/Support/FileTest.php b/tests/Support/FileTest.php
index dfdac19d3..6d681bfc2 100644
--- a/tests/Support/FileTest.php
+++ b/tests/Support/FileTest.php
@@ -8,6 +8,7 @@
     expect(File::getHumanReadableSize(1000))->toEqual('1000 B');
     expect(File::getHumanReadableSize(10000))->toEqual('9.77 KB');
     expect(File::getHumanReadableSize(10000))->toEqual('9.77 KB');
+    expect(File::getHumanReadableSize(-10000))->toEqual('9.77 KB');
     $this->assertEquals('976.56 KB', File::getHumanReadableSize(1_000_000));
     $this->assertEquals('9.54 MB', File::getHumanReadableSize(10_000_000));
     $this->assertEquals('9.31 GB', File::getHumanReadableSize(10_000_000_000));
@@ -16,6 +17,7 @@
     $this->assertEquals('86.74 EB', File::getHumanReadableSize(100_000_000_000_000_000_000));
     $this->assertEquals('84.7 ZB', File::getHumanReadableSize(100_000_000_000_000_000_000_000));
     $this->assertEquals('82.72 YB', File::getHumanReadableSize(100_000_000_000_000_000_000_000_000));
+    $this->assertEquals('82.72 YB', File::getHumanReadableSize(-100_000_000_000_000_000_000_000_000));
 });
 
 it('can determine the mime type of a file', function () {