const { ensureNonNegativeAmount } = require("../../../src/routes/reimbursements").__testables;
const { AppError } = require("../../../src/utils/AppError");

describe("reimbursement total amount defense", () => {
  function assertRejected(value, detail, reasonCode) {
    let caught;
    try {
      ensureNonNegativeAmount(value);
    } catch (error) {
      caught = error;
    }
    expect(caught).toBeInstanceOf(AppError);
    expect(caught).toMatchObject({
      code: "VALID_001",
      statusCode: 400,
      details: { total_amount: detail, reasonCode },
    });
  }

  it.each([-1, "-0.01", -Number.MIN_VALUE])("directly rejects negative total %s", (value) => {
    assertRejected(value, "negative_not_allowed", "reimbursement.total_amount_negative_not_allowed");
  });

  it.each([NaN, Infinity, -Infinity, "not-a-number", undefined])("directly rejects non-finite total %s", (value) => {
    assertRejected(value, "invalid", "reimbursement.total_amount_invalid");
  });

  it.each([0, "0.00", 1, "188.80"])("preserves acceptance of finite nonnegative total %s", (value) => {
    expect(() => ensureNonNegativeAmount(value)).not.toThrow();
  });
});