math/fraction_test.ts at master · ramoncs283/math · GitHub

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import { assertAlmostEquals, assertEquals } from "@std/assert";
import { Fraction } from "./fraction.ts";

Deno.test("fraction of 1/1 is 1.0", () => {
  // Arrange
  const fraction = new Fraction(1, 1);

  // Act
  const float = fraction.toFloat(0.1);

  // Assert
  assertEquals(float, 1.0);
});

Deno.test("fraction of 2/3 is roughly 0.67", () => {
  // Arrange
  const fraction = new Fraction(2, 3);

  // Act
  const float = fraction.toFloat(0.01);

  // Assert
  assertAlmostEquals(float, 0.67);
});

Deno.test("1/3 + 2/6 = 2/3 is roughly 0.67", () => {
  // Arrange
  const left = new Fraction(1, 3);
  const right = new Fraction(2, 6);

  // Act
  left.add(right);

  // Assert
  assertAlmostEquals(left.toFloat(0.01), 0.67);
});

Deno.test("3/3 - 1/3 = 2/3 is roughly 0.67", () => {
  // Arrange
  const left = new Fraction(3, 3);
  const right = new Fraction(1, 3);

  // Act
  left.subtract(right);

  // Assert
  assertAlmostEquals(left.toFloat(0.01), 0.67);
});

Deno.test("2/3 * 2/3 = 4/9 is roughly 0.444", () => {
  // Arrange
  const left = new Fraction(2, 3);
  const right = new Fraction(2, 3);

  // Act
  left.multiply(right);

  // Assert
  assertAlmostEquals(left.toFloat(0.001), 0.444);
});

Deno.test("10/3 / 2/3 = 5/3 is roughly 2.0", () => {
  // Arrange
  const left = new Fraction(10, 3);
  const right = new Fraction(5, 3);

  // Act
  left.divide(right);

  // Assert
  assertAlmostEquals(left.toFloat(0.1), 2.0);
});