nushell/crates/nu-command/tests/commands/break_.rs
JT 62e34b69b3
New commands: break, continue, return, and loop (#7230)
# Description

This adds `break`, `continue`, `return`, and `loop`.

* `break` - breaks out a loop
* `continue` - continues a loop at the next iteration
* `return` - early return from a function call
* `loop` - loop forever (until the loop hits a break)

Examples:
```
for i in 1..10 {
    if $i == 5 {
       continue
    } 
    print $i
}
```

```
for i in 1..10 {
    if $i == 5 {
        break
    } 
    print $i
}
```

```
def foo [x] {
    if true {
        return 2
    }
    $x
}
foo 100
```

```
loop { print "hello, forever" }
```

```
[1, 2, 3, 4, 5] | each {|x| 
    if $x > 3 { break }
    $x
}
```

# User-Facing Changes

Adds the above commands.

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.
2022-11-25 09:39:16 +13:00

38 lines
666 B
Rust

use nu_test_support::{nu, pipeline};
#[test]
fn break_for_loop() {
let actual = nu!(
cwd: ".", pipeline(
r#"
for i in 1..10 { if $i == 2 { break }; print $i }
"#
));
assert_eq!(actual.out, r#"1"#);
}
#[test]
fn break_while_loop() {
let actual = nu!(
cwd: ".", pipeline(
r#"
while true { break }; print "hello"
"#
));
assert_eq!(actual.out, r#"hello"#);
}
#[test]
fn break_each() {
let actual = nu!(
cwd: ".", pipeline(
r#"
[1, 2, 3, 4, 5] | each {|x| if $x > 3 { break }; $x} | math sum
"#
));
assert_eq!(actual.out, r#"6"#);
}