$ cargo test
   Compiling cacher v0.1.0 (file:///projects/cacher)
    Finished test [unoptimized + debuginfo] target(s) in 0.72s
     Running unittests (target/debug/deps/cacher-074d7c200c000afa)

running 1 test
test tests::call_with_different_values ... FAILED

failures:

---- tests::call_with_different_values stdout ----
thread 'main' panicked at 'assertion failed: `(left == right)`
  left: `1`,
 right: `2`', src/lib.rs:43:9
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    tests::call_with_different_values

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

error: test failed, to rerun pass '--lib'