Tests: Add a test for JPEG images with random bytes between segments

The image have been generated with our encoder but with the little twist
of calling this function after some segments.

ErrorOr<void> add_bytes(Stream& stream) {
    for (u8 i{}; i < NumericLimits<u8>::max(); ++i)
        TRY(stream.write_value<u8>(i));

    return {};
}

Author: LucasChollet

Tests/LibGfx/TestImageDecoder.cpp

@@ -585,6 +585,15 @@ TEST_CASE(test_jpeg_malformed_frame)
     }
 }
 
+TEST_CASE(test_jpeg_random_bytes_between_segments)
+{
+    auto file = TRY_OR_FAIL(Core::MappedFile::map(TEST_INPUT("jpg/random_bytes_between_segments.jpg"sv)));
+    EXPECT(Gfx::JPEGImageDecoderPlugin::sniff(file->bytes()));
+    auto plugin_decoder = TRY_OR_FAIL(Gfx::JPEGImageDecoderPlugin::create(file->bytes()));
+
+    TRY_OR_FAIL(expect_single_frame_of_size(*plugin_decoder, { 16, 16 }));
+}
+
 TEST_CASE(test_jpeg2000_spec_annex_j_10_bitplane_decoding)
 {
     // J.10.4 Arithmetic-coded compressed data