GPUI State Login - Testing Filters Without Opening a Window

Most of our application is visual but the filtering logic is just normal Rust. We can test it without opening a GPUI window.

Add these tests at the bottom of main.rs:

#[cfg(test)]
mod tests {
    use super::*;
 
    #[test]
    fn default_view_shows_every_active_issue() {
        let app = App::new();
        assert_eq!(app.visible_issues().len(), 5);
    }
 
    #[test]
    fn assigned_tab_filters_the_issue_collection() {
        let mut app = App::new();
        app.active_tab = IssueTab::AssignedToMe;
        assert_eq!(app.visible_issues().len(), 3);
    }
 
    #[test]
    fn completed_issues_leave_the_active_view_but_remain_in_projects() {
        let mut app = App::new();
        app.issues[0].completed = true;
 
        assert_eq!(app.visible_issues().len(), 4);
 
        app.navigation = Navigation::Projects;
        assert_eq!(app.visible_issues().len(), 5);
    }
 
    #[test]
    fn navigation_and_tabs_are_combined() {
        let mut app = App::new();
        app.navigation = Navigation::MyIssues;
        app.active_tab = IssueTab::CreatedByMe;
 
        let issues = app.visible_issues();
        assert_eq!(issues.len(), 1);
        assert_eq!(issues[0].id, "ENG-122");
    }
}

Run them with:

cargo test

You should see:

test result: ok. 4 passed; 0 failed

Once the tests pass, launch the application one final time:

cargo run

Now check the complete interaction flow:

1. Click every sidebar item and watch the heading change.
2. Switch between all three tabs.
3. Select several issue cards.
4. Complete an issue from Active issues.
5. Open Projects and restore it.
6. Confirm that all visible counts update.
7. Produce a filter with no results and check the empty state.

GPUI Kit tests component state without launching a normal application window as well. Its button tests construct buttons, resolve their selected and disabled styles and assert the result directly in source.