Test-Driven JavaScript Development

Matchers

Matchers are used to compare the expected and actual values or validation of the expected value. If a matcher is going to compare the expected value, it takes actual value as argument. Matchers are chained with expectations. There are a number of matchers provided by Jasmine. Here is a list of all matchers:

• toBe(): This matcher compares using the identity (= = =) operator.

  var a = 5;
  expect(a).toBe(5);
  expect(a).not.toBe("5");

  The difference between the identity operator (= = =) and equality operator (= =) is that in identity operator, no type conversion is done before comparison.

• toEqual(): This matcher is used to compare simple literals, variables, and functions.

  expect(a).toEqual(5); // checking for simple variables. expect(a).not.toEqual(3); ...