forked from extern/nushell
030e55acbf
related to - https://github.com/nushell/nushell/pull/10770 # Description because some people look into `unfold` already (myself included lol) and there will be 4 weeks with that new command which has a decent section in the release note, i fear that https://github.com/nushell/nushell/pull/10770 is a bit too brutal, removing `unfold` without any warning... this PR brings `unfold` back to life. the `unfold` command will have a deprecation warning and will be removed in 0.88. # User-Facing Changes `unfold` is only deprecated, not removed. # Tests + Formatting # After Submitting
103 lines
2.1 KiB
Rust
103 lines
2.1 KiB
Rust
use nu_test_support::{nu, pipeline};
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#[test]
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fn unfold_no_next_break() {
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let actual =
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nu!("unfold 1 {|x| if $x == 3 { {out: $x}} else { {out: $x, next: ($x + 1)} }} | to nuon");
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assert_eq!(actual.out, "[1, 2, 3]");
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}
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#[test]
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fn unfold_null_break() {
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let actual = nu!("unfold 1 {|x| if $x <= 3 { {out: $x, next: ($x + 1)} }} | to nuon");
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assert_eq!(actual.out, "[1, 2, 3]");
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}
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#[test]
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fn unfold_allows_empty_output() {
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let actual = nu!(pipeline(
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r#"
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unfold 0 {|x|
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if $x == 1 {
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{next: ($x + 1)}
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} else if $x < 3 {
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{out: $x, next: ($x + 1)}
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}
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} | to nuon
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"#
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));
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assert_eq!(actual.out, "[0, 2]");
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}
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#[test]
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fn unfold_allows_no_output() {
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let actual = nu!(pipeline(
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r#"
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unfold 0 {|x|
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if $x < 3 {
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{next: ($x + 1)}
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}
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} | to nuon
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"#
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));
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assert_eq!(actual.out, "[]");
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}
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#[test]
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fn unfold_allows_null_state() {
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let actual = nu!(pipeline(
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r#"
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unfold 0 {|x|
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if $x == null {
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{out: "done"}
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} else if $x < 1 {
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{out: "going", next: ($x + 1)}
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} else {
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{out: "stopping", next: null}
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}
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} | to nuon
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"#
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));
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assert_eq!(actual.out, "[going, stopping, done]");
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}
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#[test]
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fn unfold_allows_null_output() {
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let actual = nu!(pipeline(
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r#"
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unfold 0 {|x|
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if $x == 3 {
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{out: "done"}
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} else {
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{out: null, next: ($x + 1)}
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}
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} | to nuon
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"#
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));
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assert_eq!(actual.out, "[null, null, null, done]");
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}
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#[test]
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fn unfold_disallows_extra_keys() {
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let actual = nu!("unfold 0 {|x| {foo: bar, out: $x}}");
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assert!(actual.err.contains("Invalid block return"));
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}
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#[test]
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fn unfold_disallows_list() {
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let actual = nu!("unfold 0 {|x| [$x, ($x + 1)]}");
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assert!(actual.err.contains("Invalid block return"));
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}
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#[test]
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fn unfold_disallows_primitive() {
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let actual = nu!("unfold 0 {|x| 1}");
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assert!(actual.err.contains("Invalid block return"));
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}
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