Detail panes: poster top right, title and facts left, plot below; sextant rendering

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/ui/detail_test.go

@@ -0,0 +1,76 @@
+package ui
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/gdamore/tcell/v2"
+)
+
+func rowText(screen tcell.SimulationScreen, y, x0, x1 int) string {
+	var b strings.Builder
+	for x := x0; x < x1; x++ {
+		ch, _, _, _ := screen.GetContent(x, y)
+		b.WriteRune(ch)
+	}
+	return b.String()
+}
+
+func TestDetailPaneLayout(t *testing.T) {
+	a := newTestApp(t)
+	screen := tcell.NewSimulationScreen("")
+	if err := screen.Init(); err != nil {
+		t.Fatal(err)
+	}
+	defer screen.Fini()
+	screen.SetSize(60, 40)
+
+	d := newDetailPane(a)
+	d.SetRect(0, 0, 60, 40)
+	d.Show(detailText{head: "[::b]The Matrix (1999)[::-]\nStatus: released", plot: "Plot text goes here"}, coverRef{})
+
+	// Without a poster everything is one text.
+	d.Draw(screen)
+	if got := rowText(screen, 1, 1, 30); !strings.HasPrefix(got, "The Matrix (1999)") {
+		t.Errorf("first line = %q", got)
+	}
+	if got := rowText(screen, 3, 1, 30); !strings.HasPrefix(got, "Plot text goes here") {
+		t.Errorf("without a poster the plot follows the head: %q", got)
+	}
+
+	// With a poster: head on the left, poster on the right, plot below both.
+	d.hasCover = true
+	d.cover.setImage(stripes(40, 60))
+	d.Draw(screen)
+	if got := rowText(screen, 1, 1, 30); !strings.HasPrefix(got, "The Matrix (1999)") {
+		t.Errorf("head moved: %q", got)
+	}
+	coverX := -1
+	for x := 59; x > 30; x-- {
+		if ch, _, st, _ := screen.GetContent(x, 1); ch != ' ' || st != tcell.StyleDefault {
+			coverX = x
+			break
+		}
+	}
+	if coverX < 55 {
+		t.Errorf("no poster against the right edge (last drawn column %d)", coverX)
+	}
+	// The plot starts below the poster: 40*2/5 = 24 columns -> 24*3/2/2 = 18 rows.
+	plotRow := -1
+	for y := 1; y < 39; y++ {
+		if strings.HasPrefix(rowText(screen, y, 1, 30), "Plot text goes here") {
+			plotRow = y
+			break
+		}
+	}
+	if plotRow < 18 {
+		t.Errorf("plot at row %d, want below the poster", plotRow)
+	}
+
+	// A pane too short for the poster falls back to plain text.
+	d.SetRect(0, 0, 60, 14)
+	d.Draw(screen)
+	if !d.combined {
+		t.Error("a short pane must drop the poster")
+	}
+}