BDD

The BDD interface provides describe(), context(), it(), specify(), before(), after(), beforeEach(), and afterEach().

context() is just an alias for describe(), and behaves the same way; it provides a way to keep tests easier to read and organized. Similarly, specify() is an alias for it().

Note

All of the previous examples were written using the BDD interface.

describe("Array", function () {
  before(function () {
    // ...
  });

  describe("#indexOf()", function () {
    context("when not present", function () {
      it("should not throw an error", function () {
        (function () {
          [1, 2, 3].indexOf(4);
        }).should.not.throw();
      });
      it("should return -1", function () {
        [1, 2, 3].indexOf(4).should.equal(-1);
      });
    });

    context("when present", function () {
      it("should return the index where the element first appears in the array", function () {
        [1, 2, 3].indexOf(3).should.equal(2);
      });
    });
  });
});