Struct EnvVarGuard 

pub struct EnvVarGuard { /* private fields */ }

Mutates an environment variable for the duration of the guard, restoring the original state on drop.

• EnvVarGuard::set: ensures the variable is SET to a value
• EnvVarGuard::removed: ensures the variable is UNSET

Implementations

impl EnvVarGuard

pub fn set<K, V>(key: K, value: V) -> Self

where K: AsRef<OsStr>, V: AsRef<OsStr>,

Sets key to value, remembering the previous state.

Safety contract

Caller must ensure multi-threaded environment mutation is guarded via serial execution (#[serial]) or process-isolated integration tests.

pub fn removed<K>(key: K) -> Self

where K: AsRef<OsStr>,

Removes key from the environment, remembering the previous state.

Safety contract

Caller must ensure multi-threaded environment mutation is guarded via serial execution (#[serial]) or process-isolated integration tests.

Trait Implementations

impl Drop for EnvVarGuard

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.