cal.pub0.org/packages/lib/text.test.ts

import { truncate } from "./text";

describe("Text util tests", () => {
  describe("fn: truncate", () => {
    it("should return the original text when it is shorter than the max length", () => {
      const cases = [
        {
          input: "Hello world",
          maxLength: 100,
          expected: "Hello world",
        },
        {
          input: "Hello world",
          maxLength: 11,
          expected: "Hello world",
        },
      ];

      for (const { input, maxLength, expected } of cases) {
        const result = truncate(input, maxLength);

        expect(result).toEqual(expected);
      }
    });

    it("should return the truncated text when it is longer than the max length", () => {
      const cases = [
        {
          input: "Hello world",
          maxLength: 10,
          expected: "Hello w...",
        },
        {
          input: "Hello world",
          maxLength: 5,
          expected: "He...",
        },
      ];

      for (const { input, maxLength, expected } of cases) {
        const result = truncate(input, maxLength);

        expect(result).toEqual(expected);
      }
    });

    it("should return the truncated text without ellipsis when it is longer than the max length and ellipsis is false", () => {
      const cases = [
        {
          input: "Hello world",
          maxLength: 10,
          ellipsis: false,
          expected: "Hello w",
        },
        {
          input: "Hello world",
          maxLength: 5,
          ellipsis: false,
          expected: "He",
        },
      ];

      for (const { input, maxLength, ellipsis, expected } of cases) {
        const result = truncate(input, maxLength, ellipsis);

        expect(result).toEqual(expected);
      }
    });
  });
});