arf-console 0.7.0-alpha.1

A cross-platform R console written in Rust
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use super::*;
use crate::pager::help::browser::tests::topic;
use crate::pager::text_utils::{exceeds_width, scroll_display, truncate_to_width};
use arf_harp::help::HelpTopic;
use std::sync::Arc;

#[test]
fn test_truncate_to_width_no_truncation() {
    assert_eq!(truncate_to_width("Hello", 10), "Hello");
    assert_eq!(truncate_to_width("Hello", 5), "Hello");
}

#[test]
fn test_truncate_to_width_with_truncation() {
    assert_eq!(truncate_to_width("Hello World", 8), "Hello W…");
    assert_eq!(truncate_to_width("Hello World", 6), "Hello…");
}

#[test]
fn test_truncate_to_width_edge_cases() {
    assert_eq!(truncate_to_width("Hi", 1), "…");
    assert_eq!(truncate_to_width("Hi", 0), "");
    assert_eq!(truncate_to_width("", 5), "");
}

#[test]
fn test_truncate_to_width_unicode() {
    assert_eq!(truncate_to_width("日本語テスト", 7), "日本語…");
    assert_eq!(truncate_to_width("日本語", 10), "日本語");
}

#[test]
fn test_calculate_layout_standard() {
    assert_eq!(calculate_layout(80), (26, 49));
}

#[test]
fn test_calculate_layout_wide() {
    assert_eq!(calculate_layout(120), (40, 75));
}

#[test]
fn test_calculate_layout_narrow() {
    assert_eq!(calculate_layout(60), (20, 35));
}

#[test]
fn test_calculate_layout_very_narrow() {
    assert_eq!(calculate_layout(40), (20, 15));
}

#[test]
fn test_exceeds_width() {
    assert!(!exceeds_width("Hello", 10));
    assert!(!exceeds_width("Hello", 5));
    assert!(exceeds_width("Hello World", 8));
    assert!(exceeds_width("Hello", 4));
}

#[test]
fn test_scroll_display_no_truncation() {
    assert_eq!(scroll_display("Hello", 10, 0), ("Hello".to_owned(), 0));
}

#[test]
fn test_scroll_display_at_start() {
    assert_eq!(
        scroll_display("Hello World", 8, 0),
        ("Hello W…".to_owned(), 4)
    );
}

#[test]
fn test_scroll_display_at_end() {
    assert_eq!(scroll_display("Hello World", 8, 10).0, "…o World");
}

#[test]
fn test_scroll_display_in_middle() {
    assert_eq!(scroll_display("Hello World", 8, 2).0, "…llo Wo…");
}

#[test]
fn test_scroll_display_unicode() {
    assert_eq!(
        scroll_display("日本語テスト", 7, 0),
        ("日本語…".to_owned(), 6)
    );
    assert_eq!(scroll_display("日本語テスト", 7, 100).0, "…テスト");
}

#[test]
fn pending_search_renders_old_candidates_and_only_shows_placeholder_when_empty() {
    let topics: Arc<[HelpTopic]> = vec![
        topic("pkg", "old_first", &[], "First old title"),
        topic("pkg", "old_selected", &[], "Selected old title"),
    ]
    .into();
    let mut browser = HelpBrowser::new(Arc::clone(&topics), Vec::new(), "new");
    browser.filtered = vec![(0, 12), (1, 10)];
    browser.selected = 1;
    browser.text_scroll.scroll_pos = 4;
    browser.start_search();

    let mut frame = Vec::new();
    browser.render_to(&mut frame, 80, 12).unwrap();
    let rendered = String::from_utf8(frame).unwrap();
    assert!(rendered.contains("2 topics"));
    assert!(rendered.contains("old_first"));
    assert!(rendered.contains("old_selected"));
    assert!(!rendered.contains("Searching"));

    browser.filtered.clear();
    let mut empty_frame = Vec::new();
    browser.render_to(&mut empty_frame, 80, 12).unwrap();
    let rendered = String::from_utf8(empty_frame).unwrap();
    assert!(rendered.contains("Searching"));
}