nu-command 0.112.2

Nushell's built-in commands
Documentation 
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use nu_test_support::fs::Stub::EmptyFile;
use nu_test_support::nu;
use nu_test_support::playground::Playground;

#[test]
fn gets_all_rows_by_every_zero() {
    Playground::setup("every_test_1", |dirs, sandbox| {
        sandbox.with_files(&[
            EmptyFile("amigos.txt"),
            EmptyFile("arepas.clu"),
            EmptyFile("los.txt"),
            EmptyFile("tres.txt"),
        ]);

        let actual = nu!(cwd: dirs.test(), "
            ls
            | get name
            | every 0
            | to json --raw
        ");

        assert_eq!(
            actual.out,
            r#"["amigos.txt","arepas.clu","los.txt","tres.txt"]"#
        );
    })
}

#[test]
fn gets_no_rows_by_every_skip_zero() {
    Playground::setup("every_test_2", |dirs, sandbox| {
        sandbox.with_files(&[
            EmptyFile("amigos.txt"),
            EmptyFile("arepas.clu"),
            EmptyFile("los.txt"),
            EmptyFile("tres.txt"),
        ]);

        let actual = nu!(cwd: dirs.test(), "
            ls
            | get name
            | every 0 --skip
            | to json --raw
        ");

        assert_eq!(actual.out, "[]");
    })
}

#[test]
fn gets_all_rows_by_every_one() {
    Playground::setup("every_test_3", |dirs, sandbox| {
        sandbox.with_files(&[
            EmptyFile("amigos.txt"),
            EmptyFile("arepas.clu"),
            EmptyFile("los.txt"),
            EmptyFile("tres.txt"),
        ]);

        let actual = nu!(cwd: dirs.test(), "
            ls
            | get name
            | every 1
            | to json --raw
        ");

        assert_eq!(
            actual.out,
            r#"["amigos.txt","arepas.clu","los.txt","tres.txt"]"#
        );
    })
}

#[test]
fn gets_no_rows_by_every_skip_one() {
    Playground::setup("every_test_4", |dirs, sandbox| {
        sandbox.with_files(&[
            EmptyFile("amigos.txt"),
            EmptyFile("arepas.clu"),
            EmptyFile("los.txt"),
            EmptyFile("tres.txt"),
        ]);

        let actual = nu!(cwd: dirs.test(), "
            ls
            | get name
            | every 1 --skip
            | to json --raw
        ");

        assert_eq!(actual.out, "[]");
    })
}

#[test]
fn gets_first_row_by_every_too_much() {
    Playground::setup("every_test_5", |dirs, sandbox| {
        sandbox.with_files(&[
            EmptyFile("amigos.txt"),
            EmptyFile("arepas.clu"),
            EmptyFile("los.txt"),
            EmptyFile("tres.txt"),
        ]);

        let actual = nu!(cwd: dirs.test(), "
            ls
            | get name
            | every 999
        ");

        let expected = nu!( cwd: dirs.test(), "echo [ amigos.txt ]");

        assert_eq!(actual.out, expected.out);
    })
}

#[test]
fn gets_all_rows_except_first_by_every_skip_too_much() {
    Playground::setup("every_test_6", |dirs, sandbox| {
        sandbox.with_files(&[
            EmptyFile("amigos.txt"),
            EmptyFile("arepas.clu"),
            EmptyFile("los.txt"),
            EmptyFile("tres.txt"),
        ]);

        let actual = nu!(cwd: dirs.test(), "
            ls
            | get name
            | every 999 --skip
            | to json --raw
        ");

        assert_eq!(actual.out, r#"["arepas.clu","los.txt","tres.txt"]"#);
    })
}

#[test]
fn gets_every_third_row() {
    Playground::setup("every_test_7", |dirs, sandbox| {
        sandbox.with_files(&[
            EmptyFile("amigos.txt"),
            EmptyFile("arepas.clu"),
            EmptyFile("los.txt"),
            EmptyFile("quatro.txt"),
            EmptyFile("tres.txt"),
        ]);

        let actual = nu!(cwd: dirs.test(), "
            ls
            | get name
            | every 3
            | to json --raw
        ");

        assert_eq!(actual.out, r#"["amigos.txt","quatro.txt"]"#);
    })
}

#[test]
fn skips_every_third_row() {
    Playground::setup("every_test_8", |dirs, sandbox| {
        sandbox.with_files(&[
            EmptyFile("amigos.txt"),
            EmptyFile("arepas.clu"),
            EmptyFile("los.txt"),
            EmptyFile("quatro.txt"),
            EmptyFile("tres.txt"),
        ]);

        let actual = nu!(cwd: dirs.test(), "
            ls
            | get name
            | every 3 --skip
            | to json --raw
        ");

        assert_eq!(actual.out, r#"["arepas.clu","los.txt","tres.txt"]"#);
    })
}