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master @ 28 LINES
 
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import { describe, expect, it } from "vitest";
import { buildSparkline } from "./Sparkline";

describe("buildSparkline", () => {
  it("emits one glyph per value", () => {
    expect([...buildSparkline([1, 2, 3])]).toHaveLength(3);
  });

  it("maps min to the lowest block and max to the highest", () => {
    const s = [...buildSparkline([0, 100])];
    expect(s[0]).toBe("▁");
    expect(s[1]).toBe("█");
  });

  it("renders a flat series at mid height", () => {
    expect(buildSparkline([5, 5, 5])).toBe("▄▄▄");
  });

  it("bucket-averages long series down to width", () => {
    const s = buildSparkline(Array.from({ length: 100 }, (_, i) => i), 10);
    expect([...s]).toHaveLength(10);
  });

  it("handles empty input", () => {
    expect(buildSparkline([])).toBe("");
  });
});


import { describe, expect, it } from "vitest
";
import { buildSparkline } from "./Sparkline"
;

describe("buildSparkline", () => {
  it("emits one glyph per value", () => {
    expect([...buildSparkline([1, 2, 3])]).t
oHaveLength(3);
  });

  it("maps min to the lowest block and max t
o the highest", () => {
    const s = [...buildSparkline([0, 100])];
    expect(s[0]).toBe("▁");
    expect(s[1]).toBe("█");
  });

  it("renders a flat series at mid height", 
() => {
    expect(buildSparkline([5, 5, 5])).toBe("
▄▄▄");
  });

  it("bucket-averages long series down to wi
dth", () => {
    const s = buildSparkline(Array.from({ le
ngth: 100 }, (_, i) => i), 10);
    expect([...s]).toHaveLength(10);
  });

  it("handles empty input", () => {
    expect(buildSparkline([])).toBe("");
  });
});

 
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