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, acc| $it + $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#"
[{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}
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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#"
[[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");
}
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#[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 }
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"#
)
);
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 [] { |it, acc|
with-env [value $it] {
echo $acc | append (10 * ($env.value | into 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 { |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");
}