Struct slog_term::TestStdoutWriter
source · [−]pub struct TestStdoutWriter;
Expand description
Replacement for std::io::stdout()
for when output capturing by rust’s test
harness is required.
Note
Due to the way that output capturing works in Rust, using this class has no effect if the logger is later passed to another thread that is not controlled by Rust’s testing framework. See rust-lang/rust#42474 for reference.
For this reason, combining this drain with Async, for example, has no effect.
Example
#[test]
fn test_logger() {
let logger = {
let decorator = slog_term::PlainSyncDecorator::new(slog_term::TestStdoutWriter);
let drain = slog_term::FullFormat::new(decorator).build().fuse();
Logger::root_typed(drain, o!())
};
info!(logger, "Hi from logger test");
}
Trait Implementations
sourceimpl Write for TestStdoutWriter
impl Write for TestStdoutWriter
sourcefn write(&mut self, data: &[u8]) -> Result<usize>
fn write(&mut self, data: &[u8]) -> Result<usize>
Write a buffer into this writer, returning how many bytes were written. Read more
sourcefn flush(&mut self) -> Result<()>
fn flush(&mut self) -> Result<()>
Flush this output stream, ensuring that all intermediately buffered contents reach their destination. Read more
sourcefn is_write_vectored(&self) -> bool
fn is_write_vectored(&self) -> bool
can_vector
)Determines if this Write
r has an efficient write_vectored
implementation. Read more
1.0.0 · sourcefn write_all(&mut self, buf: &[u8]) -> Result<(), Error>
fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>
Attempts to write an entire buffer into this writer. Read more
sourcefn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>
fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>
write_all_vectored
)Attempts to write multiple buffers into this writer. Read more
Auto Trait Implementations
impl RefUnwindSafe for TestStdoutWriter
impl Send for TestStdoutWriter
impl Sync for TestStdoutWriter
impl Unpin for TestStdoutWriter
impl UnwindSafe for TestStdoutWriter
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcepub fn borrow_mut(&mut self) -> &mut T
pub fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more