Expectations

TestBox allows you to create BDD expectations with our expectations and matcher API DSL. You start by calling our expect() method, usually with an actual value you would like to test. You then concatenate the expectation of that actual value/function to a result or what we call a matcher. You can also concatenate matchers (as of v2.1.0) so you can provide multiple matching expectations to a single value.

expect( 43 ).toBe( 42 );
expect( () => calculator.add(2,2) ).toThrow();