nushell/crates/nu-command/tests/commands/reduce.rs

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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 + (math eval $"($acc)^1.05")}
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| into string -d 1
"#
)
);
assert_eq!(actual.out, "180.6");
}
#[test]
fn reduce_table_column_with_path() {
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
| reduce -f 20 { $it.total + (math eval $"($acc)^1.05")}
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| into string -d 1
"#
)
);
assert_eq!(actual.out, "180.6");
}
#[test]
fn reduce_rows_example() {
let actual = nu!(
cwd: ".", pipeline(
r#"
echo a,b 1,2 3,4
| split column ,
| headers
| reduce -f 1.6 { $acc * ($it.a | str to-int) + ($it.b | str to-int) }
"#
)
);
assert_eq!(actual.out, "14.8");
}
#[test]
fn reduce_numbered_example() {
let actual = nu!(
cwd: ".", pipeline(
r#"
echo one longest three bar
| reduce -n { if ($it.item | str length) > ($acc.item | str length) {echo $it} {echo $acc}}
| get index
"#
)
);
assert_eq!(actual.out, "1");
}
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#[test]
fn reduce_numbered_integer_addition_example() {
let actual = nu!(
cwd: ".", pipeline(
r#"
echo [1 2 3 4]
| reduce -n { $acc.item + $it.item }
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| get item
"#
)
);
assert_eq!(actual.out, "10");
}
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#[test]
fn folding_with_tables() {
let actual = nu!(
cwd: ".", pipeline(
r#"
echo [10 20 30 40]
| reduce -f [] {
with-env [value $it] {
echo $acc | append (10 * ($nu.env.value | str to-int))
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}
}
| 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 { $acc + $it }
"#
)
);
assert!(actual.err.contains("Coercion"));
}
#[test]
fn error_reduce_empty() {
let actual = nu!(
cwd: ".", pipeline(
r#"
reduce { $acc + $it }
"#
)
);
assert!(actual.err.contains("needs input"));
}