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test(widget): add unit tests for Paragraph #156

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May 4, 2023
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test(widget): add unit tests for Paragraph #156

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212 changes: 209 additions & 3 deletions src/widgets/paragraph.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -203,12 +203,218 @@ impl<'a> Widget for Paragraph<'a> {
#[cfg(test)]
mod test {
use super::*;
use crate::{
style::Color,
text::{Span, Spans},
widgets::Borders,
};

#[test]
fn zero_width_char_at_end_of_line() {
let line = "foo\0";
let paragraph = Paragraph::new(line);
let mut buf = Buffer::with_lines(vec![line]);
paragraph.render(*buf.area(), &mut buf);
let mut buffer = Buffer::empty(Rect::new(0, 0, 3, 1));

Paragraph::new(line).render(buffer.area, &mut buffer);

let expected_buffer = Buffer::with_lines(vec!["foo"]);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_empty_paragraph() {
let mut buffer = Buffer::empty(Rect::new(0, 0, 10, 5));

Paragraph::new("").render(Rect::new(0, 0, 10, 5), &mut buffer);

let expected_buffer = Buffer::with_lines(vec![" "; 5]);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_single_line_paragraph() {
let mut buffer = Buffer::empty(Rect::new(0, 0, 15, 1));

Paragraph::new("Hello, world!").render(buffer.area, &mut buffer);

let expected_buffer = Buffer::with_lines(vec!["Hello, world! "]);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_multi_line_paragraph() {
let mut buffer = Buffer::empty(Rect::new(0, 0, 15, 3));

Paragraph::new("This is a\nmultiline\nparagraph.").render(buffer.area, &mut buffer);

let expected_buffer = Buffer::with_lines(vec![
"This is a ",
"multiline ",
"paragraph. ",
]);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_paragraph_with_block() {
let mut buffer = Buffer::empty(Rect::new(0, 0, 15, 3));

Paragraph::new("Hello, world!")
.block(Block::default().title("Title").borders(Borders::ALL))
.render(buffer.area, &mut buffer);

let expected_buffer = Buffer::with_lines(vec![
"┌Title────────┐",
"│Hello, world!│",
"└─────────────┘",
]);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_paragraph_without_block() {
let area = Rect::new(0, 0, 15, 1);
let mut buffer = Buffer::empty(area);

Paragraph::new("Hello, world!").render(buffer.area, &mut buffer);

let expected_buffer = Buffer::with_lines(vec!["Hello, world! "]);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_paragraph_with_word_wrap() {
let mut buffer = Buffer::empty(Rect::new(0, 0, 15, 4));

Paragraph::new("This is a long line of text that should wrap.")
.wrap(Wrap { trim: true })
.render(buffer.area, &mut buffer);

let expected_buffer = Buffer::with_lines(vec![
"This is a long ",
"line of text ",
"that should ",
"wrap. ",
]);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_paragraph_with_line_truncation() {
let paragraph = Paragraph::new("This is a long line of text that should be truncated.");
let mut buffer = Buffer::empty(Rect::new(0, 0, 10, 1));
paragraph.render(buffer.area, &mut buffer);

let expected_buffer = Buffer::with_lines(vec!["This is a "]);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_paragraph_with_left_alignment() {
let mut buffer = Buffer::empty(Rect::new(0, 0, 15, 1));

Paragraph::new("Hello, world!")
.alignment(Alignment::Left)
.render(buffer.area, &mut buffer);

let expected_buffer = Buffer::with_lines(vec!["Hello, world! "]);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_paragraph_with_center_alignment() {
let mut buffer = Buffer::empty(Rect::new(0, 0, 15, 1));

Paragraph::new("Hello, world!")
.alignment(Alignment::Center)
.render(buffer.area, &mut buffer);

let expected_buffer = Buffer::with_lines(vec![" Hello, world! "]);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_paragraph_with_right_alignment() {
let mut buffer = Buffer::empty(Rect::new(0, 0, 15, 1));

Paragraph::new("Hello, world!")
.alignment(Alignment::Right)
.render(buffer.area, &mut buffer);

let expected_buffer = Buffer::with_lines(vec![" Hello, world!"]);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_paragraph_with_scroll_offset() {
let mut buffer = Buffer::empty(Rect::new(0, 0, 15, 3));

Paragraph::new("This is a\nmultiline\nparagraph.")
.scroll((1, 0))
.render(buffer.area, &mut buffer);

let expected_buffer = Buffer::with_lines(vec![
"multiline ",
"paragraph. ",
" ",
]);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_paragraph_with_zero_width_area() {
let area = Rect::new(0, 0, 0, 3);
let mut buffer = Buffer::empty(area);

Paragraph::new("Hello, world!").render(buffer.area, &mut buffer);

let expected_buffer = Buffer::empty(area);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_paragraph_with_zero_height_area() {
let area = Rect::new(0, 0, 10, 0);
let mut buffer = Buffer::empty(area);

Paragraph::new("Hello, world!").render(buffer.area, &mut buffer);

let expected_buffer = Buffer::empty(area);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_paragraph_with_styled_text() {
let mut buffer = Buffer::empty(Rect::new(0, 0, 13, 1));

Paragraph::new(Spans::from(vec![
Span::styled("Hello, ", Style::default().fg(Color::Red)),
Span::styled("world!", Style::default().fg(Color::Blue)),
]))
.render(buffer.area, &mut buffer);

let mut expected_buffer = Buffer::with_lines(vec!["Hello, world!"]);
expected_buffer.set_style(Rect::new(0, 0, 7, 1), Style::default().fg(Color::Red));
expected_buffer.set_style(Rect::new(7, 0, 6, 1), Style::default().fg(Color::Blue));
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_paragraph_with_special_characters() {
let mut buffer = Buffer::empty(Rect::new(0, 0, 15, 1));

Paragraph::new("Hello, <world>!").render(buffer.area, &mut buffer);

let expected_buffer = Buffer::with_lines(vec!["Hello, <world>!"]);
assert_eq!(buffer, expected_buffer);
}

#[test]
fn test_render_paragraph_with_unicode_characters() {
let mut buffer = Buffer::empty(Rect::new(0, 0, 20, 1));

Paragraph::new("こんにちは, 世界! 😃").render(buffer.area, &mut buffer);

let expected_buffer = Buffer::with_lines(vec!["こんにちは, 世界! 😃"]);
assert_eq!(buffer, expected_buffer);
}
}