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https://github.com/nushell/nushell
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95d4922e44
Closes #7581. After this PR, `describe` shows `(stream)` next to input that arrived at `describe` as a `ListStream`: ```bash 〉ls | describe table<name: string, type: string, size: filesize, modified: date> (stream) 〉[1 2 3] | each {|i| $i} | describe list<int> (stream) ``` `describe` must collect all items of the stream to display type information for lists and tables. If users need to avoid collecting input, they can use the `-n`/`--no-collect` flag: ```bash 〉[1 2 3] | each {|i| $i} | describe --no-collect stream ```
107 lines
2.3 KiB
Rust
107 lines
2.3 KiB
Rust
use nu_test_support::fs::Stub::EmptyFile;
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use nu_test_support::playground::Playground;
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use nu_test_support::{nu, pipeline};
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#[test]
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fn gets_first_rows_by_amount() {
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Playground::setup("first_test_1", |dirs, sandbox| {
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sandbox.with_files(vec![
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EmptyFile("los.txt"),
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EmptyFile("tres.txt"),
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EmptyFile("amigos.txt"),
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EmptyFile("arepas.clu"),
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]);
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let actual = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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ls
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| first 3
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| length
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"#
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));
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assert_eq!(actual.out, "3");
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})
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}
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#[test]
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fn gets_all_rows_if_amount_higher_than_all_rows() {
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Playground::setup("first_test_2", |dirs, sandbox| {
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sandbox.with_files(vec![
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EmptyFile("los.txt"),
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EmptyFile("tres.txt"),
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EmptyFile("amigos.txt"),
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EmptyFile("arepas.clu"),
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]);
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let actual = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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ls
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| first 99
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| length
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"#
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));
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assert_eq!(actual.out, "4");
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})
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}
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#[test]
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fn gets_first_row_when_no_amount_given() {
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Playground::setup("first_test_3", |dirs, sandbox| {
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sandbox.with_files(vec![EmptyFile("caballeros.txt"), EmptyFile("arepas.clu")]);
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let actual = nu!(
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cwd: dirs.test(), pipeline(
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r#"
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ls
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| first
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| length
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"#
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));
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assert_eq!(actual.out, "1");
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})
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}
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#[test]
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fn gets_first_row_as_list_when_amount_given() {
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let actual = nu!(
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cwd: ".", pipeline(
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r#"
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[1, 2, 3]
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| first 1
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| describe
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"#
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));
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assert_eq!(actual.out, "list<int> (stream)");
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}
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#[test]
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// covers a situation where `first` used to behave strangely on list<binary> input
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fn works_with_binary_list() {
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let actual = nu!(
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cwd: ".", pipeline(
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r#"
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([0x[01 11]] | first) == 0x[01 11]
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"#
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));
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assert_eq!(actual.out, "true");
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}
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#[test]
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fn errors_on_negative_rows() {
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let actual = nu!(
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cwd: ".", pipeline(
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r#"
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[1, 2, 3]
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| first -10
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"#
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));
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assert!(actual.err.contains("use a positive value"));
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}
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