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master @ 25 LINES
 
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import { describe, expect, it } from "vitest";
import { buildSliderTrack } from "./Slider";
import { len } from "../../lib/ascii";

describe("buildSliderTrack", () => {
  it("renders the exact cell width", () => {
    expect(len(buildSliderTrack(50, 0, 100, 20))).toBe(20);
  });

  it("pins the thumb to the ends at min and max", () => {
    expect(buildSliderTrack(0, 0, 100, 12)).toBe("├█─────────┤");
    expect(buildSliderTrack(100, 0, 100, 12)).toBe("├─────────█┤");
  });

  it("centers the thumb at the midpoint", () => {
    const t = [...buildSliderTrack(50, 0, 100, 13)];
    expect(t[6]).toBe("█");
  });

  it("clamps out-of-range values", () => {
    expect(buildSliderTrack(-10, 0, 100, 12)).toBe(buildSliderTrack(0, 0, 100, 12)
);
    expect(buildSliderTrack(250, 0, 100, 12)).toBe(buildSliderTrack(100, 0, 100, 1
2));
  });
});


import { describe, expect, it } from "vitest
";
import { buildSliderTrack } from "./Slider";
import { len } from "../../lib/ascii";

describe("buildSliderTrack", () => {
  it("renders the exact cell width", () => {
    expect(len(buildSliderTrack(50, 0, 100, 
20))).toBe(20);
  });

  it("pins the thumb to the ends at min and 
max", () => {
    expect(buildSliderTrack(0, 0, 100, 12)).
toBe("├█─────────┤");
    expect(buildSliderTrack(100, 0, 100, 12)
).toBe("├─────────█┤");
  });

  it("centers the thumb at the midpoint", ()
 => {
    const t = [...buildSliderTrack(50, 0, 10
0, 13)];
    expect(t[6]).toBe("█");
  });

  it("clamps out-of-range values", () => {
    expect(buildSliderTrack(-10, 0, 100, 12)
).toBe(buildSliderTrack(0, 0, 100, 12));
    expect(buildSliderTrack(250, 0, 100, 12)
).toBe(buildSliderTrack(100, 0, 100, 12));
  });
});

 
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