ratatui/tests/widgets_table.rs

#![allow(deprecated)]

use ratatui::{
    backend::TestBackend,
    buffer::Buffer,
    layout::Constraint,
    style::{Color, Modifier, Style},
    text::{Line, Span},
    widgets::{Block, Borders, Cell, HighlightSpacing, Row, Table, TableState},
    Terminal,
};

#[test]
fn widgets_table_column_spacing_can_be_changed() {
    let test_case = |column_spacing, expected| {
        let backend = TestBackend::new(30, 10);
        let mut terminal = Terminal::new(backend).unwrap();

        terminal
            .draw(|f| {
                let size = f.size();
                let table = Table::new(
                    vec![
                        Row::new(vec!["Row11", "Row12", "Row13"]),
                        Row::new(vec!["Row21", "Row22", "Row23"]),
                        Row::new(vec!["Row31", "Row32", "Row33"]),
                        Row::new(vec!["Row41", "Row42", "Row43"]),
                    ],
                    [
                        Constraint::Length(5),
                        Constraint::Length(5),
                        Constraint::Length(5),
                    ],
                )
                .header(Row::new(vec!["Head1", "Head2", "Head3"]).bottom_margin(1))
                .block(Block::default().borders(Borders::ALL))
                .column_spacing(column_spacing);
                f.render_widget(table, size);
            })
            .unwrap();
        terminal.backend().assert_buffer(&expected);
    };

    // no space between columns
    test_case(
        0,
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1Head2Head3             │",
            "│                            │",
            "│Row11Row12Row13             │",
            "│Row21Row22Row23             │",
            "│Row31Row32Row33             │",
            "│Row41Row42Row43             │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // one space between columns
    test_case(
        1,
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1 Head2 Head3           │",
            "│                            │",
            "│Row11 Row12 Row13           │",
            "│Row21 Row22 Row23           │",
            "│Row31 Row32 Row33           │",
            "│Row41 Row42 Row43           │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // enough space to just not hide the third column
    test_case(
        6,
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1      Head2      Head3 │",
            "│                            │",
            "│Row11      Row12      Row13 │",
            "│Row21      Row22      Row23 │",
            "│Row31      Row32      Row33 │",
            "│Row41      Row42      Row43 │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // enough space to hide part of the third column
    test_case(
        7,
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1       Head       Head3│",
            "│                            │",
            "│Row11       Row1       Row13│",
            "│Row21       Row2       Row23│",
            "│Row31       Row3       Row33│",
            "│Row41       Row4       Row43│",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );
}

#[test]
fn widgets_table_columns_widths_can_use_fixed_length_constraints() {
    let test_case = |widths, expected| {
        let backend = TestBackend::new(30, 10);
        let mut terminal = Terminal::new(backend).unwrap();

        terminal
            .draw(|f| {
                let size = f.size();
                let table = Table::new(
                    vec![
                        Row::new(vec!["Row11", "Row12", "Row13"]),
                        Row::new(vec!["Row21", "Row22", "Row23"]),
                        Row::new(vec!["Row31", "Row32", "Row33"]),
                        Row::new(vec!["Row41", "Row42", "Row43"]),
                    ],
                    widths,
                )
                .header(Row::new(vec!["Head1", "Head2", "Head3"]).bottom_margin(1))
                .block(Block::default().borders(Borders::ALL));
                f.render_widget(table, size);
            })
            .unwrap();
        terminal.backend().assert_buffer(&expected);
    };

    // columns of zero width show nothing
    test_case(
        &[
            Constraint::Length(0),
            Constraint::Length(0),
            Constraint::Length(0),
        ],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // columns of 1 width trim
    test_case(
        &[
            Constraint::Length(1),
            Constraint::Length(1),
            Constraint::Length(1),
        ],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│H H H                       │",
            "│                            │",
            "│R R R                       │",
            "│R R R                       │",
            "│R R R                       │",
            "│R R R                       │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // columns of large width just before pushing a column off
    test_case(
        &[
            Constraint::Length(8),
            Constraint::Length(8),
            Constraint::Length(8),
        ],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1    Head2    Head3     │",
            "│                            │",
            "│Row11    Row12    Row13     │",
            "│Row21    Row22    Row23     │",
            "│Row31    Row32    Row33     │",
            "│Row41    Row42    Row43     │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );
}

#[test]
fn widgets_table_columns_widths_can_use_percentage_constraints() {
    #[allow(clippy::needless_pass_by_value)]
    #[track_caller]
    fn test_case(widths: &[Constraint], expected: Buffer) {
        let backend = TestBackend::new(30, 10);
        let mut terminal = Terminal::new(backend).unwrap();

        terminal
            .draw(|f| {
                let size = f.size();
                let table = Table::new(
                    vec![
                        Row::new(vec!["Row11", "Row12", "Row13"]),
                        Row::new(vec!["Row21", "Row22", "Row23"]),
                        Row::new(vec!["Row31", "Row32", "Row33"]),
                        Row::new(vec!["Row41", "Row42", "Row43"]),
                    ],
                    widths,
                )
                .header(Row::new(vec!["Head1", "Head2", "Head3"]).bottom_margin(1))
                .block(Block::default().borders(Borders::ALL))
                .column_spacing(0);
                f.render_widget(table, size);
            })
            .unwrap();
        terminal.backend().assert_buffer(&expected);
    }

    // columns of zero width show nothing
    test_case(
        &[
            Constraint::Percentage(0),
            Constraint::Percentage(0),
            Constraint::Percentage(0),
        ],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // columns of not enough width trims the data
    test_case(
        &[
            Constraint::Percentage(11),
            Constraint::Percentage(11),
            Constraint::Percentage(11),
        ],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│HeaHeaHea                   │",
            "│                            │",
            "│RowRowRow                   │",
            "│RowRowRow                   │",
            "│RowRowRow                   │",
            "│RowRowRow                   │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // columns of large width just before pushing a column off
    test_case(
        &[
            Constraint::Percentage(33),
            Constraint::Percentage(33),
            Constraint::Percentage(33),
        ],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1    Head2    Head3     │",
            "│                            │",
            "│Row11    Row12    Row13     │",
            "│Row21    Row22    Row23     │",
            "│Row31    Row32    Row33     │",
            "│Row41    Row42    Row43     │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // percentages summing to 100 should give equal widths
    test_case(
        &[Constraint::Percentage(50), Constraint::Percentage(50)],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1         Head2         │",
            "│                            │",
            "│Row11         Row12         │",
            "│Row21         Row22         │",
            "│Row31         Row32         │",
            "│Row41         Row42         │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );
}

#[test]
fn widgets_table_columns_widths_can_use_mixed_constraints() {
    #[allow(clippy::needless_pass_by_value)]
    #[track_caller]
    fn test_case(widths: &[Constraint], expected: Buffer) {
        let backend = TestBackend::new(30, 10);
        let mut terminal = Terminal::new(backend).unwrap();

        terminal
            .draw(|f| {
                let size = f.size();
                let table = Table::new(
                    vec![
                        Row::new(vec!["Row11", "Row12", "Row13"]),
                        Row::new(vec!["Row21", "Row22", "Row23"]),
                        Row::new(vec!["Row31", "Row32", "Row33"]),
                        Row::new(vec!["Row41", "Row42", "Row43"]),
                    ],
                    widths,
                )
                .header(Row::new(vec!["Head1", "Head2", "Head3"]).bottom_margin(1))
                .block(Block::default().borders(Borders::ALL));
                f.render_widget(table, size);
            })
            .unwrap();
        terminal.backend().assert_buffer(&expected);
    }

    // columns of zero width show nothing
    test_case(
        &[
            Constraint::Percentage(0),
            Constraint::Length(0),
            Constraint::Percentage(0),
        ],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // columns of not enough width trims the data
    test_case(
        &[
            Constraint::Percentage(11),
            Constraint::Length(20),
            Constraint::Percentage(11),
        ],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Hea Head2                Hea│",
            "│                            │",
            "│Row Row12                Row│",
            "│Row Row22                Row│",
            "│Row Row32                Row│",
            "│Row Row42                Row│",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // columns of large width just before pushing a column off
    test_case(
        &[
            Constraint::Percentage(33),
            Constraint::Length(10),
            Constraint::Percentage(33),
        ],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1     Head2      Head3  │",
            "│                            │",
            "│Row11     Row12      Row13  │",
            "│Row21     Row22      Row23  │",
            "│Row31     Row32      Row33  │",
            "│Row41     Row42      Row43  │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // columns of large size (>100% total) hide the last column
    test_case(
        &[
            Constraint::Percentage(60),
            Constraint::Length(10),
            Constraint::Percentage(60),
        ],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1      Head2      Head3 │",
            "│                            │",
            "│Row11      Row12      Row13 │",
            "│Row21      Row22      Row23 │",
            "│Row31      Row32      Row33 │",
            "│Row41      Row42      Row43 │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );
}

#[test]
fn widgets_table_columns_widths_can_use_ratio_constraints() {
    #[allow(clippy::needless_pass_by_value)]
    #[track_caller]
    fn test_case(widths: &[Constraint], expected: Buffer) {
        let backend = TestBackend::new(30, 10);
        let mut terminal = Terminal::new(backend).unwrap();

        terminal
            .draw(|f| {
                let size = f.size();
                let table = Table::new(
                    vec![
                        Row::new(vec!["Row11", "Row12", "Row13"]),
                        Row::new(vec!["Row21", "Row22", "Row23"]),
                        Row::new(vec!["Row31", "Row32", "Row33"]),
                        Row::new(vec!["Row41", "Row42", "Row43"]),
                    ],
                    widths,
                )
                .header(Row::new(vec!["Head1", "Head2", "Head3"]).bottom_margin(1))
                .block(Block::default().borders(Borders::ALL))
                .column_spacing(0);
                f.render_widget(table, size);
            })
            .unwrap();
        terminal.backend().assert_buffer(&expected);
    }

    // columns of zero width show nothing
    test_case(
        &[
            Constraint::Ratio(0, 1),
            Constraint::Ratio(0, 1),
            Constraint::Ratio(0, 1),
        ],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // columns of not enough width trims the data
    test_case(
        &[
            Constraint::Ratio(1, 9),
            Constraint::Ratio(1, 9),
            Constraint::Ratio(1, 9),
        ],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│HeaHeaHea                   │",
            "│                            │",
            "│RowRowRow                   │",
            "│RowRowRow                   │",
            "│RowRowRow                   │",
            "│RowRowRow                   │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // columns of large width just before pushing a column off
    test_case(
        &[
            Constraint::Ratio(1, 3),
            Constraint::Ratio(1, 3),
            Constraint::Ratio(1, 3),
        ],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1    Head2     Head3    │",
            "│                            │",
            "│Row11    Row12     Row13    │",
            "│Row21    Row22     Row23    │",
            "│Row31    Row32     Row33    │",
            "│Row41    Row42     Row43    │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );

    // percentages summing to 100 should give equal widths
    test_case(
        &[Constraint::Ratio(1, 2), Constraint::Ratio(1, 2)],
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1         Head2         │",
            "│                            │",
            "│Row11         Row12         │",
            "│Row21         Row22         │",
            "│Row31         Row32         │",
            "│Row41         Row42         │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );
}

#[test]
fn widgets_table_can_have_rows_with_multi_lines() {
    let test_case = |state: &mut TableState, expected: Buffer| {
        let backend = TestBackend::new(30, 8);
        let mut terminal = Terminal::new(backend).unwrap();
        terminal
            .draw(|f| {
                let size = f.size();
                let table = Table::new(
                    vec![
                        Row::new(vec!["Row11", "Row12", "Row13"]),
                        Row::new(vec!["Row21", "Row22", "Row23"]).height(2),
                        Row::new(vec!["Row31", "Row32", "Row33"]),
                        Row::new(vec!["Row41", "Row42", "Row43"]).height(2),
                    ],
                    [
                        Constraint::Length(5),
                        Constraint::Length(5),
                        Constraint::Length(5),
                    ],
                )
                .header(Row::new(vec!["Head1", "Head2", "Head3"]).bottom_margin(1))
                .block(Block::default().borders(Borders::ALL))
                .highlight_symbol(">> ")
                .column_spacing(1);
                f.render_stateful_widget(table, size, state);
            })
            .unwrap();
        terminal.backend().assert_buffer(&expected);
    };

    let mut state = TableState::default();
    // no selection
    test_case(
        &mut state,
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1 Head2 Head3           │",
            "│                            │",
            "│Row11 Row12 Row13           │",
            "│Row21 Row22 Row23           │",
            "│                            │",
            "│Row31 Row32 Row33           │",
            "└────────────────────────────┘",
        ]),
    );

    // select first
    state.select(Some(0));
    test_case(
        &mut state,
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│   Head1 Head2 Head3        │",
            "│                            │",
            "│>> Row11 Row12 Row13        │",
            "│   Row21 Row22 Row23        │",
            "│                            │",
            "│   Row31 Row32 Row33        │",
            "└────────────────────────────┘",
        ]),
    );

    // select second (we don't show partially the 4th row)
    state.select(Some(1));
    test_case(
        &mut state,
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│   Head1 Head2 Head3        │",
            "│                            │",
            "│   Row11 Row12 Row13        │",
            "│>> Row21 Row22 Row23        │",
            "│                            │",
            "│   Row31 Row32 Row33        │",
            "└────────────────────────────┘",
        ]),
    );

    // select 4th (we don't show partially the 1st row)
    state.select(Some(3));
    test_case(
        &mut state,
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│   Head1 Head2 Head3        │",
            "│                            │",
            "│   Row31 Row32 Row33        │",
            "│>> Row41 Row42 Row43        │",
            "│                            │",
            "│                            │",
            "└────────────────────────────┘",
        ]),
    );
}

#[allow(clippy::too_many_lines)]
#[test]
fn widgets_table_enable_always_highlight_spacing() {
    let test_case = |state: &mut TableState, space: HighlightSpacing, expected: Buffer| {
        let backend = TestBackend::new(30, 8);
        let mut terminal = Terminal::new(backend).unwrap();
        terminal
            .draw(|f| {
                let size = f.size();
                let table = Table::new(
                    vec![
                        Row::new(vec!["Row11", "Row12", "Row13"]),
                        Row::new(vec!["Row21", "Row22", "Row23"]).height(2),
                        Row::new(vec!["Row31", "Row32", "Row33"]),
                        Row::new(vec!["Row41", "Row42", "Row43"]).height(2),
                    ],
                    [
                        Constraint::Length(5),
                        Constraint::Length(5),
                        Constraint::Length(5),
                    ],
                )
                .header(Row::new(vec!["Head1", "Head2", "Head3"]).bottom_margin(1))
                .block(Block::default().borders(Borders::ALL))
                .highlight_symbol(">> ")
                .highlight_spacing(space)
                .column_spacing(1);
                f.render_stateful_widget(table, size, state);
            })
            .unwrap();
        terminal.backend().assert_buffer(&expected);
    };

    assert_eq!(HighlightSpacing::default(), HighlightSpacing::WhenSelected);

    let mut state = TableState::default();
    // no selection, "WhenSelected" should only allocate if selected
    test_case(
        &mut state,
        HighlightSpacing::default(),
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1 Head2 Head3           │",
            "│                            │",
            "│Row11 Row12 Row13           │",
            "│Row21 Row22 Row23           │",
            "│                            │",
            "│Row31 Row32 Row33           │",
            "└────────────────────────────┘",
        ]),
    );

    // no selection, "Always" should allocate regardless if selected or not
    test_case(
        &mut state,
        HighlightSpacing::Always,
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│   Head1 Head2 Head3        │",
            "│                            │",
            "│   Row11 Row12 Row13        │",
            "│   Row21 Row22 Row23        │",
            "│                            │",
            "│   Row31 Row32 Row33        │",
            "└────────────────────────────┘",
        ]),
    );

    // no selection, "Never" should never allocate regadless if selected or not
    test_case(
        &mut state,
        HighlightSpacing::Never,
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1 Head2 Head3           │",
            "│                            │",
            "│Row11 Row12 Row13           │",
            "│Row21 Row22 Row23           │",
            "│                            │",
            "│Row31 Row32 Row33           │",
            "└────────────────────────────┘",
        ]),
    );

    // select first, "WhenSelected" should only allocate if selected
    state.select(Some(0));
    test_case(
        &mut state,
        HighlightSpacing::default(),
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│   Head1 Head2 Head3        │",
            "│                            │",
            "│>> Row11 Row12 Row13        │",
            "│   Row21 Row22 Row23        │",
            "│                            │",
            "│   Row31 Row32 Row33        │",
            "└────────────────────────────┘",
        ]),
    );

    // select first, "Always" should allocate regardless if selected or not
    state.select(Some(0));
    test_case(
        &mut state,
        HighlightSpacing::Always,
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│   Head1 Head2 Head3        │",
            "│                            │",
            "│>> Row11 Row12 Row13        │",
            "│   Row21 Row22 Row23        │",
            "│                            │",
            "│   Row31 Row32 Row33        │",
            "└────────────────────────────┘",
        ]),
    );

    // select first, "Never" should never allocate regadless if selected or not
    state.select(Some(0));
    test_case(
        &mut state,
        HighlightSpacing::Never,
        Buffer::with_lines(vec![
            "┌────────────────────────────┐",
            "│Head1 Head2 Head3           │",
            "│                            │",
            "│Row11 Row12 Row13           │",
            "│Row21 Row22 Row23           │",
            "│                            │",
            "│Row31 Row32 Row33           │",
            "└────────────────────────────┘",
        ]),
    );
}

#[test]
fn widgets_table_can_have_elements_styled_individually() {
    let backend = TestBackend::new(30, 4);
    let mut terminal = Terminal::new(backend).unwrap();
    let mut state = TableState::default();
    state.select(Some(0));
    terminal
        .draw(|f| {
            let size = f.size();
            let table = Table::new(
                vec![
                    Row::new(vec!["Row11", "Row12", "Row13"])
                        .style(Style::default().fg(Color::Green)),
                    Row::new(vec![
                        Cell::from("Row21"),
                        Cell::from("Row22").style(Style::default().fg(Color::Yellow)),
                        Cell::from(Line::from(vec![
                            Span::raw("Row"),
                            Span::styled("23", Style::default().fg(Color::Blue)),
                        ]))
                        .style(Style::default().fg(Color::Red)),
                    ])
                    .style(Style::default().fg(Color::LightGreen)),
                ],
                [
                    Constraint::Length(6),
                    Constraint::Length(6),
                    Constraint::Length(6),
                ],
            )
            .header(Row::new(vec!["Head1", "Head2", "Head3"]).bottom_margin(1))
            .block(Block::default().borders(Borders::LEFT | Borders::RIGHT))
            .highlight_symbol(">> ")
            .highlight_style(Style::default().add_modifier(Modifier::BOLD))
            .column_spacing(1);
            f.render_stateful_widget(table, size, &mut state);
        })
        .unwrap();

    let mut expected = Buffer::with_lines(vec![
        "│   Head1  Head2  Head3      │",
        "│                            │",
        "│>> Row11  Row12  Row13      │",
        "│   Row21  Row22  Row23      │",
    ]);
    // First row = row color + highlight style
    for col in 1..=28 {
        expected.get_mut(col, 2).set_style(
            Style::default()
                .fg(Color::Green)
                .add_modifier(Modifier::BOLD),
        );
    }
    // Second row:
    // 1. row color
    for col in 1..=28 {
        expected
            .get_mut(col, 3)
            .set_style(Style::default().fg(Color::LightGreen));
    }
    // 2. cell color
    for col in 11..=16 {
        expected
            .get_mut(col, 3)
            .set_style(Style::default().fg(Color::Yellow));
    }
    for col in 18..=23 {
        expected
            .get_mut(col, 3)
            .set_style(Style::default().fg(Color::Red));
    }
    // 3. text color
    for col in 21..=22 {
        expected
            .get_mut(col, 3)
            .set_style(Style::default().fg(Color::Blue));
    }
    terminal.backend().assert_buffer(&expected);
}

#[test]
fn widgets_table_should_render_even_if_empty() {
    let backend = TestBackend::new(30, 4);
    let mut terminal = Terminal::new(backend).unwrap();
    terminal
        .draw(|f| {
            let size = f.size();
            let table = Table::new(
                Vec::<Row>::new(),
                [
                    Constraint::Length(6),
                    Constraint::Length(6),
                    Constraint::Length(6),
                ],
            )
            .header(Row::new(vec!["Head1", "Head2", "Head3"]))
            .block(Block::default().borders(Borders::LEFT | Borders::RIGHT))
            .column_spacing(1);
            f.render_widget(table, size);
        })
        .unwrap();

    let expected = Buffer::with_lines(vec![
        "│Head1  Head2  Head3         │",
        "│                            │",
        "│                            │",
        "│                            │",
    ]);

    terminal.backend().assert_buffer(&expected);
}

#[test]
fn widgets_table_columns_dont_panic() {
    let test_case = |state: &mut TableState, table: Table, width: u16| {
        let backend = TestBackend::new(width, 8);
        let mut terminal = Terminal::new(backend).unwrap();
        terminal
            .draw(|f| {
                let size = f.size();
                f.render_stateful_widget(table, size, state);
            })
            .unwrap();
    };

    // based on https://github.com/fdehau/tui-rs/issues/470#issuecomment-852562848
    let table1_width = 98;
    let table1 = Table::new(
        vec![Row::new(vec!["r1", "r2", "r3", "r4"])],
        [
            Constraint::Percentage(15),
            Constraint::Percentage(15),
            Constraint::Percentage(25),
            Constraint::Percentage(45),
        ],
    )
    .header(Row::new(vec!["h1", "h2", "h3", "h4"]))
    .block(Block::default().borders(Borders::ALL))
    .highlight_symbol(">> ")
    .column_spacing(1);

    let mut state = TableState::default();

    // select first, which would cause a panic before fix
    state.select(Some(0));
    test_case(&mut state, table1.clone(), table1_width);
}

#[test]
fn widgets_table_should_clamp_offset_if_rows_are_removed() {
    let backend = TestBackend::new(30, 8);
    let mut terminal = Terminal::new(backend).unwrap();
    let mut state = TableState::default();

    // render with 6 items => offset will be at 2
    state.select(Some(5));
    terminal
        .draw(|f| {
            let size = f.size();
            let table = Table::new(
                vec![
                    Row::new(vec!["Row01", "Row02", "Row03"]),
                    Row::new(vec!["Row11", "Row12", "Row13"]),
                    Row::new(vec!["Row21", "Row22", "Row23"]),
                    Row::new(vec!["Row31", "Row32", "Row33"]),
                    Row::new(vec!["Row41", "Row42", "Row43"]),
                    Row::new(vec!["Row51", "Row52", "Row53"]),
                ],
                [
                    Constraint::Length(5),
                    Constraint::Length(5),
                    Constraint::Length(5),
                ],
            )
            .header(Row::new(vec!["Head1", "Head2", "Head3"]).bottom_margin(1))
            .block(Block::default().borders(Borders::ALL))
            .column_spacing(1);
            f.render_stateful_widget(table, size, &mut state);
        })
        .unwrap();
    let expected = Buffer::with_lines(vec![
        "┌────────────────────────────┐",
        "│Head1 Head2 Head3           │",
        "│                            │",
        "│Row21 Row22 Row23           │",
        "│Row31 Row32 Row33           │",
        "│Row41 Row42 Row43           │",
        "│Row51 Row52 Row53           │",
        "└────────────────────────────┘",
    ]);
    terminal.backend().assert_buffer(&expected);

    // render with 1 item => offset will be at 1
    state.select(Some(1));
    terminal
        .draw(|f| {
            let size = f.size();
            let table = Table::new(
                vec![Row::new(vec!["Row31", "Row32", "Row33"])],
                [
                    Constraint::Length(5),
                    Constraint::Length(5),
                    Constraint::Length(5),
                ],
            )
            .header(Row::new(vec!["Head1", "Head2", "Head3"]).bottom_margin(1))
            .block(Block::default().borders(Borders::ALL))
            .column_spacing(1);
            f.render_stateful_widget(table, size, &mut state);
        })
        .unwrap();
    let expected = Buffer::with_lines(vec![
        "┌────────────────────────────┐",
        "│Head1 Head2 Head3           │",
        "│                            │",
        "│Row31 Row32 Row33           │",
        "│                            │",
        "│                            │",
        "│                            │",
        "└────────────────────────────┘",
    ]);
    terminal.backend().assert_buffer(&expected);
}