Learning TypeScript 2.x - Second Edition

Back to basics

The companion source code includes a class named MathDemo. This class allows us to perform the pow calculation in a few different ways. One of them is the synchronous pow function:

public pow(base: number, exponent: number) {   let result = base; 
  for (let i = 1; i < exponent; i++) { 
    result = result * base; 
  } 
  return result; 
} 

As we learned in Chapter 9, Automating Your Development Workflow, we can test the method declared in the preceding function using the following test case:

it("Should return the correct numeric value for pow", () => { 
  const math = new MathDemo(); 
  const result = math.pow(2, 3); 
  const expected = 8; 
  expect(result).to.be.a("number"); 
  expect(result).to.equal(expected); 
}); 

We can then use the nyc command with ...