js__typescript__jest/__tests__/base.spec.ts

import {
  evaluate,
  Expression,
  sampleFunction,
} from "../src";

describe("This is a simple test", () => {
  test("Check the sampleFunction function", () => {
    const actual = sampleFunction("hello");
    const expected = "hellohello";
    expect(actual).toEqual(expected);
  });
});

describe("Simple expression tests", () => {
  test("Check literal value", () => {
    expect(evaluate({ type: "literal", value: 5 })).toBeCloseTo(5);
  });

  test("Check addition", () => {
    const expr: Expression = {
      left: {
        type: "literal",
        value: 5,
      },
      operator: "+",
      right: {
        type: "literal",
        value: 10,
      },
      type: "binary",
    };
    expect(evaluate(expr)).toBeCloseTo(15);
  });

  test("Check subtraction", () => {
    const expr: Expression = {
      left: {
        type: "literal",
        value: 5,
      },
      operator: "-",
      right: {
        type: "literal",
        value: 10,
      },
      type: "binary",
    };
    expect(evaluate(expr)).toBeCloseTo(-5);
  });

  test("Check multiplication", () => {
    const expr: Expression = {
      left: {
        type: "literal",
        value: 5,
      },
      operator: "*",
      right: {
        type: "literal",
        value: 10,
      },
      type: "binary",
    };
    expect(evaluate(expr)).toBeCloseTo(50);
  });

  test("Check division", () => {
    const expr: Expression = {
      left: {
        type: "literal",
        value: 10,
      },
      operator: "/",
      right: {
        type: "literal",
        value: 5,
      },
      type: "binary",
    };
    expect(evaluate(expr)).toBeCloseTo(2);
  });
});