unit tests break on newest image-webp version (0.2.1)

[KyleSiefring]

./tests/images/webp/extended_images/anim.webp: The decoded image's hash does not match (expected = baaea4f2, actual = 2d4e14e1).
thread 'check_references' panicked at tests/reference_images.rs:299:9:
./tests/images/webp/extended_images/anim.webp: The decoded image's hash does not match (expected = baaea4f2, actual = 2d4e14e1).
stack backtrace:
   0: rust_begin_unwind
             at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/panicking.rs:665:5
   1: core::panicking::panic_fmt
             at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/core/src/panicking.rs:74:14
   2: reference_images::check_references::{{closure}}
             at ./tests/reference_images.rs:299:9
   3: reference_images::process_images
             at ./tests/reference_images.rs:37:13
   4: reference_images::check_references
             at ./tests/reference_images.rs:157:5
   5: reference_images::check_references::{{closure}}
             at ./tests/reference_images.rs:156:22
   6: core::ops::function::FnOnce::call_once
             at /home/kyle/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:250:5
   7: core::ops::function::FnOnce::call_once
             at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

Downgrading to 0.2.0 fixes this.

[kornelski]

Have you checked how these images look like?

Implementation of some algorithms has changed. If the image isn't using the lossless variant, some tiny differences could happen.

[KyleSiefring]

Have not checked and don't intend to dig further in this case. This is not a issue for me and I'm reporting out of courtesy.

[fintelia]

@KyleSiefring thanks for reporting! I think this test failure is caused by intentional changes from image-rs/image-webp#123, but we should certainly investigate and get the test passing again