109 lines
3.6 KiB
Rust
109 lines
3.6 KiB
Rust
use super::*;
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#[test]
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fn test_single_paragraph_returns_none_both_directions() {
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// Single paragraph: no double-newline separator anywhere
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let text = "p1 line1\np1 line2\np1 line3";
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let pos = text.find("line2").unwrap();
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assert_eq!(find_previous_paragraph_start(text, pos), None);
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assert_eq!(find_next_paragraph_end(text, pos), None);
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}
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#[test]
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fn test_single_paragraph_surrounded_returns_prev_and_next() {
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// Single paragraph: no double-newline separator anywhere
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let text = "\n\n\np1 line1\np1 line2\np1 line3\n\n\n";
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let pos = text.find("line2").unwrap();
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// The first empty line after the end of the paragraph (the second newline character)
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let goal_end = text.find("line3").unwrap() + "line3".len() + 1;
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assert_eq!(find_previous_paragraph_start(text, pos), Some(2.into()));
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assert_eq!(find_next_paragraph_end(text, pos), Some(goal_end.into()));
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}
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#[test]
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fn test_next_none_in_last_paragraph_previous_goes_up() {
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// Two paragraphs separated by one blank line (double newline)
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let text = "p1\n\np2";
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let pos_in_p2 = text.find("p2").unwrap();
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// previous should find the boundary before p2: index of the second newline in the pair
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// for both cursor positioning on the `p` and `2`
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assert_eq!(
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find_previous_paragraph_start(text, pos_in_p2),
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Some((pos_in_p2 - 1).into())
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);
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assert_eq!(
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find_previous_paragraph_start(text, pos_in_p2 + 1),
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Some((pos_in_p2 - 1).into())
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);
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// next should find nothing after the last paragraph
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assert_eq!(find_next_paragraph_end(text, pos_in_p2), None);
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}
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#[test]
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fn test_previous_none_in_first_paragraph_next_goes_down() {
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let text = "p1\n\np2";
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let pos_in_p1 = text.find("p1").unwrap();
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// previous should find nothing before the first paragraph
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assert_eq!(find_previous_paragraph_start(text, pos_in_p1), None);
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// next should find the boundary after p1: index of the second newline in the pair
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// for both cursor positioning on the `p` and `1`
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assert_eq!(
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find_next_paragraph_end(text, pos_in_p1),
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Some((pos_in_p1 + "p1".len() + 1).into())
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);
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assert_eq!(
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find_next_paragraph_end(text, pos_in_p1 + 1),
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Some((pos_in_p1 + "p1".len() + 1).into())
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);
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}
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#[test]
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fn test_three_paragraphs_lots_of_newlines_middle_para() {
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// Three paragraphs, separated by four newlines each
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let text = "p1\n\n\n\n".to_string() + "p2\n\n\n\n" + "p3";
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let pos_in_p2 = text.find("p2").unwrap();
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assert_eq!(
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find_previous_paragraph_start(text.as_str(), pos_in_p2),
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Some((pos_in_p2 - 1).into())
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);
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assert_eq!(
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find_next_paragraph_end(text.as_str(), pos_in_p2),
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Some((pos_in_p2 + "p2".len() + 1).into())
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);
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}
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#[test]
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fn test_cursor_in_middle_of_newline_patch_quad_runs() {
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// Lots of newlines between paras, but cursor starts in the middle of the newlines
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let text = "p1\n\n\n\n\n\n".to_string() + "p2\n\n\n\n\n\n" + "p3";
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let pos_between_p1_p2 = "p1".len() + 3;
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let pos_p2 = text.find("p2").unwrap();
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let pos_between_p2_p3 = pos_p2 + "p2".len() + 3;
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// Place cursor amongst newlines between p1 and p2
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assert_eq!(
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find_previous_paragraph_start(text.as_str(), pos_between_p1_p2),
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None
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);
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assert_eq!(
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find_next_paragraph_end(text.as_str(), pos_between_p1_p2),
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Some((pos_p2 + "p2".len() + 1).into())
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);
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// Place cursor amongst newlines between p2 and p3
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assert_eq!(
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find_previous_paragraph_start(text.as_str(), pos_between_p2_p3),
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Some((pos_p2 - 1).into())
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);
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assert_eq!(
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find_next_paragraph_end(text.as_str(), pos_between_p2_p3),
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None
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);
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}
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