import assert from "node:assert";
import { describe, it } from "node:test";
import { Chalk } from "chalk";
import { TruncatedText } from "../src/components/truncated-text.js";
import { visibleWidth } from "../src/utils.js";
const chalk = new Chalk({ level: 3 });
describe("TruncatedText component", () => {
it("pads output lines to exactly match width", () => {
const text = new TruncatedText("Hello world", 1, 0);
const lines = text.render(50);
assert.strictEqual(lines.length, 1);
const visibleLen = visibleWidth(lines[0]);
assert.strictEqual(visibleLen, 50);
});
it("pads output with vertical padding lines to width", () => {
const text = new TruncatedText("Hello", 0, 2);
const lines = text.render(40);
assert.strictEqual(lines.length, 5);
for (const line of lines) {
assert.strictEqual(visibleWidth(line), 40);
}
});
it("truncates long text and pads to width", () => {
const longText = "This is a very long piece of text that will definitely exceed the available width";
const text = new TruncatedText(longText, 1, 0);
const lines = text.render(30);
assert.strictEqual(lines.length, 1);
assert.strictEqual(visibleWidth(lines[0]), 30);
const stripped = lines[0].replace(/\x1b\[[0-9;]*m/g, "");
assert.ok(stripped.includes("..."));
});
it("preserves ANSI codes in output and pads correctly", () => {
const styledText = `${chalk.red("Hello")} ${chalk.blue("world")}`;
const text = new TruncatedText(styledText, 1, 0);
const lines = text.render(40);
assert.strictEqual(lines.length, 1);
assert.strictEqual(visibleWidth(lines[0]), 40);
assert.ok(lines[0].includes("\x1b["));
});
it("truncates styled text and adds reset code before ellipsis", () => {
const longStyledText = chalk.red("This is a very long red text that will be truncated");
const text = new TruncatedText(longStyledText, 1, 0);
const lines = text.render(20);
assert.strictEqual(lines.length, 1);
assert.strictEqual(visibleWidth(lines[0]), 20);
assert.ok(lines[0].includes("\x1b[0m..."));
});
it("handles text that fits exactly", () => {
const text = new TruncatedText("Hello world", 1, 0);
const lines = text.render(30);
assert.strictEqual(lines.length, 1);
assert.strictEqual(visibleWidth(lines[0]), 30);
const stripped = lines[0].replace(/\x1b\[[0-9;]*m/g, "");
assert.ok(!stripped.includes("..."));
});
it("handles empty text", () => {
const text = new TruncatedText("", 1, 0);
const lines = text.render(30);
assert.strictEqual(lines.length, 1);
assert.strictEqual(visibleWidth(lines[0]), 30);
});
it("stops at newline and only shows first line", () => {
const multilineText = "First line\nSecond line\nThird line";
const text = new TruncatedText(multilineText, 1, 0);
const lines = text.render(40);
assert.strictEqual(lines.length, 1);
assert.strictEqual(visibleWidth(lines[0]), 40);
const stripped = lines[0].replace(/\x1b\[[0-9;]*m/g, "").trim();
assert.ok(stripped.includes("First line"));
assert.ok(!stripped.includes("Second line"));
assert.ok(!stripped.includes("Third line"));
});
it("truncates first line even with newlines in text", () => {
const longMultilineText = "This is a very long first line that needs truncation\nSecond line";
const text = new TruncatedText(longMultilineText, 1, 0);
const lines = text.render(25);
assert.strictEqual(lines.length, 1);
assert.strictEqual(visibleWidth(lines[0]), 25);
const stripped = lines[0].replace(/\x1b\[[0-9;]*m/g, "");
assert.ok(stripped.includes("..."));
assert.ok(!stripped.includes("Second line"));
});
});