iterationMethods.test.js

const {
  filterIncomeTransactions,
  filterExpenseTransactions,
  calculateTotalIncome,
  calculateTotalExpenses,
  calculateNetTotal,
  filterSignificantTransactions,
} = require("./iterationMethods.js");

const transactions = [
  ["income", 1000],
  ["income", 1500],
  ["expense", 500],
  ["expense", 300],
  ["income", 700],
];

describe("Financial Transaction Analysis", () => {
  describe("Transaction Analysis", () => {
    describe("filterIncomeTransactions", () => {
      it("should filter only income transactions", () => {
        expect(filterIncomeTransactions(transactions)).toEqual([
          ["income", 1000],
          ["income", 1500],
          ["income", 700],
        ]);
      });
    });

    describe("filterExpenseTransactions", () => {
      it("should filter only expense transactions", () => {
        expect(filterExpenseTransactions(transactions)).toEqual([
          ["expense", 500],
          ["expense", 300],
        ]);
      });
    });
  });

  describe("Financial Summary", () => {
    describe("calculateTotalIncome", () => {
      it("should calculate the total income", () => {
        expect(calculateTotalIncome(transactions)).toBe(3200);
      });
    });

    describe("calculateTotalExpenses", () => {
      it("should calculate the total expenses", () => {
        expect(calculateTotalExpenses(transactions)).toBe(800);
      });
    });
  });

  describe("Net Analysis", () => {
    describe("calculateNetTotal", () => {
      it("should calculate the net total", () => {
        expect(calculateNetTotal(transactions)).toBe(2400);
      });
    });

    describe("filterSignificantTransactions", () => {
      it("should filter transactions above or equal to $500", () => {
        expect(filterSignificantTransactions(transactions)).toEqual([
          ["income", 1000],
          ["income", 1500],
          ["expense", 500],
          ["income", 700],
        ]);
      });
    });
  });
});