Decimal numbers in most programming languages (including JS) are internally represented in "floating point number" format. Floating point arithmetic is not exact. For example, the result of 46.5678 - 46 === 0.5678 is false because 46.5678 - 46 only yield a value that is very close to 0.5678. Even changing the order in which the program add/subtract numbers can yield different values.

So the following could happen

  expect( 1.2 + 0.6 + 0.005 ).toEqual( 1.805 );                // This fail
  expect( 1.2 + 0.6 + 0.005 ).toEqual( 1.8049999999999997 );   // This pass
  expect( 0.005 + 0.6 + 1.2 ).toEqual( 1.8049999999999997 );   // This fail

  console.log(1.2 + 0.6 + 0.005 == 1.805);  // false
  console.log(1.2 + 0.6 + 0.005 == 0.005 + 0.6 + 1.2); // false

Can you find a more appropriate way to test a value (that involves decimal number calculations) for equality?

Suggestion: Look up

• Checking equality in floating point arithmetic in JavaScript
• Checking equality in floating point arithmetic with Jest

Thank you for this. I have read about the matchers for numbers and floats now

I don't see any change made to the relevant Jest test.

Better to explicitly specify undefined instead of leaving the element blank.

What is the purpose of the test on line 31? It will always pass.