JavaScript Testing with Jasmine

Chapter 8. Reference

Jasmine on the Web

• Download Jasmine
• Jasmine wiki

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 ...