Table of Contents for
JavaScript Testing with Jasmine

Version ebook / Retour

Cover image for bash Cookbook, 2nd Edition JavaScript Testing with Jasmine by Evan Hahn Published by O'Reilly Media, Inc., 2013
  1. Cover
  2. JavaScript Testing with Jasmine
  3. JavaScript Testing with Jasmine
  4. Preface
  5. 1. Intro to Testing
  6. 2. Jasmine
  7. 3. Writing Good Tests
  8. 4. Matchers in Depth
  9. 5. More Jasmine Features
  10. 6. Spies
  11. 7. Using Jasmine with Other Tools
  12. 8. Reference
  13. About the Author
  14. Colophon
  15. Copyright

Chapter 8. Reference

Jasmine on the Web

The Basic Structure of a Suite

  describe("colors", function() {
      describe("red", function() {
          var red;
          beforeEach(function() {
              red = new Color("red");
          });
          afterEach(function() {
              red = null;
          });
          it("has the correct value", function() {
              expect(red.hex).toEqual("FF0000");
          });
          it("makes orange when mixed with yellow", function() {
              var yellow = new Color("yellow");
              var orange = new Color("orange");
              expect(red.mix(yellow)).toEqual(orange);
          });
      });
  });

Matchers Reference

  • toEqual checks for equality, not necessarily the same object.
  • toBe checks if two objects are the same.
  • toBeTruthy checks if a value is truthy (not just true).
  • toBeFalsy checks if a value is falsy (not just false).
  • toContain checks if a value is inside another.
  • toBeDefined checks if a value is defined.
  • toBeUndefined checks if a value is undefined.
  • toBeNull checks if a value is null.
  • toBeNaN checks if a value is NaN.
  • toBeCloseTo checks decimal proximity.
  • toMatch checks if a value matches a given regular expression.
  • toThrow checks if a function throws an error.
  • .not inverts the meaning of the following matcher.

List of Falsy Values

  • false
  • 0
  • ""
  • undefined (note that the variable undefined isn’t always undefined!)
  • null
  • NaN

Reserved Words in Jasmine

The following are words that you shouldn’t use in your code so that you don’t cause conflicts with Jasmine:

  • jasmine (and everything in its namespace)
  • describe
  • it
  • expect
  • beforeEach
  • afterEach
  • runs
  • waits
  • waitsFor
  • spyOn
  • xdescribe
  • xit

These are, of course, in addition to JavaScript’s reserved words, which are even more off-limits.