import { describe, expect, it } from "vitest";
import { normalizeDecimal } from "./format-decimal";

describe("normalizeDecimal", () => {
  it("strips trailing zeros from DB decimal strings", () => {
    expect(normalizeDecimal("10.000000")).toBe("10");
    expect(normalizeDecimal("1500.500000")).toBe("1500.5");
    expect(normalizeDecimal("100.010000")).toBe("100.01");
    expect(normalizeDecimal("0.000000")).toBe("0");
  });

  it("removes binary-float artifacts by rounding", () => {
    expect(normalizeDecimal(1500.5 - 500.3)).toBe("1000.2");
    expect(normalizeDecimal(0.1 + 0.2)).toBe("0.3");
  });

  it("leaves clean values untouched", () => {
    expect(normalizeDecimal("10")).toBe("10");
    expect(normalizeDecimal(10.25)).toBe("10.25");
    expect(normalizeDecimal("0")).toBe("0");
  });

  it("returns empty string for null/undefined/NaN", () => {
    expect(normalizeDecimal(null)).toBe("");
    expect(normalizeDecimal(undefined)).toBe("");
    expect(normalizeDecimal("not-a-number")).toBe("");
  });
});