test(tui): cover description layout boundaries

src/tui/components/searchable-select-list.test.ts

@@ -1,4 +1,5 @@
 import { describe, expect, it } from "vitest";
+import { visibleWidth } from "../../terminal/ansi.js";
 import { SearchableSelectList, type SearchableSelectListTheme } from "./searchable-select-list.js";
 
 const mockTheme: SearchableSelectListTheme = {
@@ -48,6 +49,60 @@ describe("SearchableSelectList", () => {
     expect(output).toContain(tail);
   });
 
+  it("does not show description layout at width 40 (boundary)", () => {
+    const items = [
+      { value: "one", label: "one", description: "desc" },
+      { value: "two", label: "two", description: "desc" },
+    ];
+    const list = new SearchableSelectList(items, 5, mockTheme);
+    list.setSelectedIndex(1); // ensure first row is not selected so description styling is applied
+
+    const output = list.render(40).join("\n");
+    expect(output).not.toContain("(desc)");
+  });
+
+  it("shows description layout at width 41 (boundary)", () => {
+    const items = [
+      { value: "one", label: "one", description: "desc" },
+      { value: "two", label: "two", description: "desc" },
+    ];
+    const list = new SearchableSelectList(items, 5, mockTheme);
+    list.setSelectedIndex(1); // ensure first row is not selected so description styling is applied
+
+    const output = list.render(41).join("\n");
+    expect(output).toContain("(desc)");
+  });
+
+  it("keeps ANSI-highlighted description rows within terminal width", () => {
+    const ansiTheme: SearchableSelectListTheme = {
+      selectedPrefix: (t) => t,
+      selectedText: (t) => t,
+      description: (t) => t,
+      scrollInfo: (t) => t,
+      noMatch: (t) => t,
+      searchPrompt: (t) => t,
+      searchInput: (t) => t,
+      matchHighlight: (t) => `\u001b[31m${t}\u001b[0m`,
+    };
+    const label = `provider/${"x".repeat(80)}`;
+    const items = [
+      { value: label, label, description: "Some description text that should not overflow" },
+      { value: "other", label: "other", description: "Other description" },
+    ];
+    const list = new SearchableSelectList(items, 5, ansiTheme);
+    list.setSelectedIndex(1); // make first row non-selected so description styling is applied
+
+    for (const ch of "provider") {
+      list.handleInput(ch);
+    }
+
+    const width = 80;
+    const output = list.render(width);
+    for (const line of output) {
+      expect(visibleWidth(line)).toBeLessThanOrEqual(width);
+    }
+  });
+
   it("filters items when typing", () => {
     const list = new SearchableSelectList(testItems, 5, mockTheme);