diff options
Diffstat (limited to 'third_party/rust/tokio/tests/io_read_to_string.rs')
-rw-r--r-- | third_party/rust/tokio/tests/io_read_to_string.rs | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/third_party/rust/tokio/tests/io_read_to_string.rs b/third_party/rust/tokio/tests/io_read_to_string.rs new file mode 100644 index 0000000000..f30c26caa8 --- /dev/null +++ b/third_party/rust/tokio/tests/io_read_to_string.rs @@ -0,0 +1,63 @@ +#![warn(rust_2018_idioms)] +#![cfg(feature = "full")] + +use std::io; +use tokio::io::AsyncReadExt; +use tokio_test::assert_ok; +use tokio_test::io::Builder; + +#[tokio::test] +async fn read_to_string() { + let mut buf = String::new(); + let mut rd: &[u8] = b"hello world"; + + let n = assert_ok!(rd.read_to_string(&mut buf).await); + assert_eq!(n, 11); + assert_eq!(buf[..], "hello world"[..]); +} + +#[tokio::test] +async fn to_string_does_not_truncate_on_utf8_error() { + let data = vec![0xff, 0xff, 0xff]; + + let mut s = "abc".to_string(); + + match AsyncReadExt::read_to_string(&mut data.as_slice(), &mut s).await { + Ok(len) => panic!("Should fail: {} bytes.", len), + Err(err) if err.to_string() == "stream did not contain valid UTF-8" => {} + Err(err) => panic!("Fail: {}.", err), + } + + assert_eq!(s, "abc"); +} + +#[tokio::test] +async fn to_string_does_not_truncate_on_io_error() { + let mut mock = Builder::new() + .read(b"def") + .read_error(io::Error::new(io::ErrorKind::Other, "whoops")) + .build(); + let mut s = "abc".to_string(); + + match AsyncReadExt::read_to_string(&mut mock, &mut s).await { + Ok(len) => panic!("Should fail: {} bytes.", len), + Err(err) if err.to_string() == "whoops" => {} + Err(err) => panic!("Fail: {}.", err), + } + + assert_eq!(s, "abc"); +} + +#[tokio::test] +async fn to_string_appends() { + let data = b"def".to_vec(); + + let mut s = "abc".to_string(); + + let len = AsyncReadExt::read_to_string(&mut data.as_slice(), &mut s) + .await + .unwrap(); + + assert_eq!(len, 3); + assert_eq!(s, "abcdef"); +} |