nushell/crates/nu-command/tests/commands/reduce.rs
Stefan Holderbach 9bc4e6794d
Remove math eval command (#7284)
Reasoning: 

Most missing math commands are implemented with #7258.
The `meval` crate itself declares that it doesn't strive to stringent
standards (https://docs.rs/meval/latest/meval/#related-projects).
For example no particular special casing or transformations are
performed to ensure numerical stability. It uses the same rust `std`
library functions we use or have access to (and `f64`).
While the command call syntax in nushell may be a bit more verbose,
having a single source of truth and common commands is beneficial.
Furthermore the `math` commands can themselves implement broadcasting
over lists (or table columns).

Closes #7073

Removed dependencies:
- `meval`
- `nom 1.2.4` (duplicate)

User-Facing Changes:

Scripts using `math eval` will break. 
We remove a further `eval` like behavior to get results through runtime evaluation (albeit limited in scope)

Tests:

- Updated tests that internally used `math eval`.
- Removed one test that primarily used `math eval` to obtain a result from `str join`
2023-01-04 23:50:18 +01:00

132 lines
2.6 KiB
Rust

use nu_test_support::{nu, pipeline};
#[test]
fn reduce_table_column() {
let actual = nu!(
cwd: ".", pipeline(
r#"
echo "[{month:2,total:30}, {month:3,total:10}, {month:4,total:3}, {month:5,total:60}]"
| from json
| get total
| reduce -f 20 { |it, acc| $it + $acc ** 1.05}
| into string -d 1
"#
)
);
assert_eq!(actual.out, "180.6");
}
#[test]
fn reduce_table_column_with_path() {
let actual = nu!(
cwd: ".", pipeline(
r#"
[{month:2,total:30}, {month:3,total:10}, {month:4,total:3}, {month:5,total:60}]
| reduce -f 20 { |it, acc| $it.total + $acc ** 1.05}
| into string -d 1
"#
)
);
assert_eq!(actual.out, "180.6");
}
#[test]
fn reduce_rows_example() {
let actual = nu!(
cwd: ".", pipeline(
r#"
[[a,b]; [1,2] [3,4]]
| reduce -f 1.6 { |it, acc| $acc * ($it.a | into int) + ($it.b | into int) }
"#
)
);
assert_eq!(actual.out, "14.8");
}
#[test]
fn reduce_numbered_example() {
let actual = nu!(
cwd: ".", pipeline(
r#"
echo one longest three bar
| reduce -n { |it, acc| if ($it.item | str length) > ($acc.item | str length) {echo $it} else {echo $acc}}
| get index
"#
)
);
assert_eq!(actual.out, "1");
}
#[test]
fn reduce_numbered_integer_addition_example() {
let actual = nu!(
cwd: ".", pipeline(
r#"
echo [1 2 3 4]
| reduce -n { |it, acc| $acc.item + $it.item }
"#
)
);
assert_eq!(actual.out, "10");
}
#[test]
fn folding_with_tables() {
let actual = nu!(
cwd: ".", pipeline(
r#"
echo [10 20 30 40]
| reduce -f [] { |it, acc|
with-env [value $it] {
echo $acc | append (10 * ($env.value | into int))
}
}
| math sum
"#
)
);
assert_eq!(actual.out, "1000");
}
#[test]
fn error_reduce_fold_type_mismatch() {
let actual = nu!(
cwd: ".", pipeline(
r#"
echo a b c | reduce -f 0 { |it, acc| $acc + $it }
"#
)
);
assert!(actual.err.contains("mismatch"));
}
#[test]
fn error_reduce_empty() {
let actual = nu!(
cwd: ".", pipeline(
r#"
reduce { |it, acc| $acc + $it }
"#
)
);
assert!(actual.err.contains("needs input"));
}
#[test]
fn uses_optional_index_argument() {
let actual = nu!(
cwd: ".", pipeline(
r#"[18 19 20] | reduce -f 0 {|elem accum index| $accum + $index } | to nuon"#
));
assert_eq!(actual.out, "3");
}