Replace if … { assert!(true, "{}", err); } else { panic!() }` with `assert!(result.is_err(), …);`

Replace `assert!(false, …)`/`assert!(false)` with `panic!(…)`/`panic!()`

Unify `assert_eq!(…)`/`assert_ne!(…)` to take args in order of `…!(actual, expected)`

While there isn't an explicit convention for this in Rust the stdlib docs all use `assert_eq!(actual, expected)`

Unify `assert_eq!(…)`/`assert_ne!(…)` to take args in order of `…!(actual, expected)`

While there isn't an explicit convention for this in Rust the stdlib docs all use `assert_eq!(actual, expected)`, making it a sort of implicit convention.

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