三角形JavaScript问题/单元测试不起作用（茉莉花）

Question

I written code to determine if a triangle is equilateral, isosceles, or scalene. Next, I'm suppose to test it using Jasmine but my code keep failing. I am very new to unit testing. Please help me!

TriangleSpec:

describe('Determine if a triangle is equilateral, isolene, scalene', 
function () {
  it('equilateral triangles have equal sides', function () {
    var triangle = new isTriangle (5, 5, 5)
    expect(triangle).toEqual("Equilateral");
  });

Triangle.js:

function isTriangle(side1, side2, side3){
  if (side1 === 0 || side2 === 0 || side3 === 0) {
      console.log("Error");
  } else if (side1 < 0 || side2 < 0 || side3 < 0) {
      console.log("Error");
  } else if (side1 + side2 <= side3 || side1 + side3 <= side2 || side2 +
    side3 <= side1) {
    console.log("Error");
  }
  else if (side1 == side2 && side2 == side3) {
    console.log("Equilateral");
  } else if (side1 === side2 || side2 === side3 || side1 === side3) {
    console.log("Isosceles");
  } else {
    console.log("Scalene");
  }
};

isTriangle(6, 6, 5);

Answer 1

There are two issues:

• Your isTriangle function is not returning the result; it merely outputs it with console.log , but that does not count as the return value of a function. So replace all your console.log("some result") to return "some result"

• The function is not a constructor, so it should not be called with new . In your test code just do: var triangle = isTriangle (5, 5, 5)