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40ae34194c
detects redundant imports that can be eliminated. for #117772 : In order to facilitate review and modification, split the checking code and removing redundant imports code into two PR.
61 lines
1.3 KiB
Rust
61 lines
1.3 KiB
Rust
use std::borrow::Cow;
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use std::ffi::{CStr, OsStr};
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use std::path::Path;
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use std::rc::Rc;
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use std::sync::Arc;
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macro_rules! test_from_cow {
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($value:ident => $($ty:ty),+) => {$(
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let borrowed = <$ty>::from(Cow::Borrowed($value));
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let owned = <$ty>::from(Cow::Owned($value.to_owned()));
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assert_eq!($value, &*borrowed);
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assert_eq!($value, &*owned);
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)+};
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($value:ident : & $ty:ty) => {
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test_from_cow!($value => Box<$ty>, Rc<$ty>, Arc<$ty>);
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}
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}
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#[test]
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fn test_from_cow_slice() {
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let slice: &[i32] = &[1, 2, 3];
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test_from_cow!(slice: &[i32]);
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}
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#[test]
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fn test_from_cow_str() {
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let string = "hello";
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test_from_cow!(string: &str);
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}
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#[test]
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fn test_from_cow_c_str() {
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let string = CStr::from_bytes_with_nul(b"hello\0").unwrap();
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test_from_cow!(string: &CStr);
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}
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#[test]
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fn test_from_cow_os_str() {
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let string = OsStr::new("hello");
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test_from_cow!(string: &OsStr);
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}
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#[test]
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fn test_from_cow_path() {
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let path = Path::new("hello");
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test_from_cow!(path: &Path);
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}
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#[test]
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fn cow_const() {
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// test that the methods of `Cow` are usable in a const context
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const COW: Cow<'_, str> = Cow::Borrowed("moo");
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const IS_BORROWED: bool = COW.is_borrowed();
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assert!(IS_BORROWED);
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const IS_OWNED: bool = COW.is_owned();
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assert!(!IS_OWNED);
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}
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