Struct IsErr 

pub struct IsErr;

Trait Implementations

impl<T, E> Expectation<&Result<T, E>> for IsErr

where T: Debug, E: Debug,

fn test(&mut self, subject: &&Result<T, E>) -> bool

Verifies whether the actual subject fulfills the expected property.

fn message( &self, expression: &Expression<'_>, actual: &&Result<T, E>, inverted: bool, format: &DiffFormat, ) -> String

Forms a failure message for this expectation.

impl<T, E> Expectation<Result<T, E>> for IsErr

where T: Debug, E: Debug,

fn test(&mut self, subject: &Result<T, E>) -> bool

Verifies whether the actual subject fulfills the expected property.

fn message( &self, expression: &Expression<'_>, actual: &Result<T, E>, _inverted: bool, format: &DiffFormat, ) -> String

Forms a failure message for this expectation.