import { truncateToWidth, visibleWidth } from "@earendil-works/pi-tui";
import { describe, expect, it } from "vitest";
/**
* Tests for truncateToWidth behavior with Unicode characters.
*
* These tests verify that truncateToWidth properly handles text with
* Unicode characters that have different byte vs display widths.
*/
describe("truncateToWidth", () => {
it("should truncate messages with Unicode characters correctly", () => {
// This message contains a checkmark (✔) which may have display width > 1 byte
const message = '✔ script to run › dev $ concurrently "vite" "node --import tsx ./';
const width = 67;
const maxMsgWidth = width - 2; // Account for cursor
const truncated = truncateToWidth(message, maxMsgWidth);
const truncatedWidth = visibleWidth(truncated);
expect(truncatedWidth).toBeLessThanOrEqual(maxMsgWidth);
});
it("should handle emoji characters", () => {
const message = "🎉 Celebration! 🚀 Launch 📦 Package ready for deployment now";
const width = 40;
const maxMsgWidth = width - 2;
const truncated = truncateToWidth(message, maxMsgWidth);
const truncatedWidth = visibleWidth(truncated);
expect(truncatedWidth).toBeLessThanOrEqual(maxMsgWidth);
});
it("should handle mixed ASCII and wide characters", () => {
const message = "Hello 世界 Test 你好 More text here that is long";
const width = 30;
const maxMsgWidth = width - 2;
const truncated = truncateToWidth(message, maxMsgWidth);
const truncatedWidth = visibleWidth(truncated);
expect(truncatedWidth).toBeLessThanOrEqual(maxMsgWidth);
});
it("should not truncate messages that fit", () => {
const message = "Short message";
const width = 50;
const maxMsgWidth = width - 2;
const truncated = truncateToWidth(message, maxMsgWidth);
expect(truncated).toBe(message);
expect(visibleWidth(truncated)).toBeLessThanOrEqual(maxMsgWidth);
});
it("should add ellipsis when truncating", () => {
const message = "This is a very long message that needs to be truncated";
const width = 30;
const maxMsgWidth = width - 2;
const truncated = truncateToWidth(message, maxMsgWidth);
expect(truncated).toContain("...");
expect(visibleWidth(truncated)).toBeLessThanOrEqual(maxMsgWidth);
});
it("should handle the exact crash case from issue report", () => {
// Terminal width was 67, line had visible width 68
// The problematic text contained "✔" and "›" characters
const message = '✔ script to run › dev $ concurrently "vite" "node --import tsx ./server.ts"';
const terminalWidth = 67;
const cursorWidth = 2; // "› " or " "
const maxMsgWidth = terminalWidth - cursorWidth;
const truncated = truncateToWidth(message, maxMsgWidth);
const finalWidth = visibleWidth(truncated);
// The final line (cursor + message) must not exceed terminal width
expect(finalWidth + cursorWidth).toBeLessThanOrEqual(terminalWidth);
});
});