It

its are the examples of the spec. A Description holds a group of its, where each it has at least one expectation.

An it has the form of

it("description string", _ {...})

An it can also have an implicit description that is generated by the contained expectation

it(_{...})

Each it is run as part of the containing parent Description, whether that be the toplevel describe or an explain.

So for example,

describe an_example_it("An example of an it", $ {
    it("looks like this", {...});
});