Struct abscissa_core::testing::prelude::Stderr

pub struct Stderr(_);

Buffered reader for standard error

Methods from Deref<Target = BufReader<ChildStderr>>

pub fn get_ref(&self) -> &R

Gets a reference to the underlying reader.

It is inadvisable to directly read from the underlying reader.

Examples

use std::io::BufReader;
use std::fs::File;

fn main() -> std::io::Result<()> {
    let f1 = File::open("log.txt")?;
    let reader = BufReader::new(f1);

    let f2 = reader.get_ref();
    Ok(())
}

pub fn get_mut(&mut self) -> &mut R

Gets a mutable reference to the underlying reader.

It is inadvisable to directly read from the underlying reader.

Examples

use std::io::BufReader;
use std::fs::File;

fn main() -> std::io::Result<()> {
    let f1 = File::open("log.txt")?;
    let mut reader = BufReader::new(f1);

    let f2 = reader.get_mut();
    Ok(())
}

pub fn buffer(&self) -> &[u8]

Returns a reference to the internally buffered data.

Unlike fill_buf, this will not attempt to fill the buffer if it is empty.

Examples

use std::io::{BufReader, BufRead};
use std::fs::File;

fn main() -> std::io::Result<()> {
    let f = File::open("log.txt")?;
    let mut reader = BufReader::new(f);
    assert!(reader.buffer().is_empty());

    if reader.fill_buf()?.len() > 0 {
        assert!(!reader.buffer().is_empty());
    }
    Ok(())
}

pub fn seek_relative(&mut self, offset: i64) -> Result<(), Error>

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

Seeks relative to the current position. If the new position lies within the buffer, the buffer will not be flushed, allowing for more efficient seeks. This method does not return the location of the underlying reader, so the caller must track this information themselves if it is required.

Trait Implementations

impl OutputStream<ChildStderr> for Stderr

fn expect_line(&mut self, expected_line: &str)

Read a line and ensure it matches the expected value.

fn expect_regex<T>(&mut self, regex: T) where
    T: Into<Regex>, 

Read a line and test it against the given regex.

impl DerefMut for Stderr

fn deref_mut(&mut self) -> &mut BufReader<ChildStderr>

Mutably dereferences the value.

impl Deref for Stderr

type Target = BufReader<ChildStderr>

The resulting type after dereferencing.

fn deref(&self) -> &BufReader<ChildStderr>

Dereferences the value.

impl Debug for Stderr

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.