github-migration
/
jasmine
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Update docs about Matchers to use addMatcher().

This commit is contained in:
Christian Williams 2010-02-20 14:44:58 -05:00
parent 8679090bf3
commit 535d9abce0
1 changed files with 21 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
README.markdown
View File

@ -98,36 +98,33 @@ Results of the expectations are logged for later for reporting.
Jasmine has several built-in matchers. Here are a few: Jasmine has several built-in matchers. Here are a few:
`toEqual()` compares objects or primitives and returns true if they are equal >`expect(x).toEqual(y);` compares objects or primitives `x` and `y` and passes if they are equivalent
>`expect(x).toMatch(pattern);` compares `x` to string or regular expression `pattern` and passes if they match
`toNotEqual()` compares objects or primitives and returns true if they are not equal >`expect(x).toBeDefined();` passes if `x` is not `undefined`
>`expect(x).toBeNull();` passes if `x` is not `null`
`toMatch()` takes a regex or a string and returns true if it matches >`expect(x).toBeTruthy();` passes if `x` evaluates to true
>`expect(x).toBeFalsy();` passes if `x` evaluates to false
`toNotMatch()` takes a regex or a string and returns true if it does not match >`expect(x).toContain(y);` passes if array or string `x` contains `y`
`toBeDefined()` returns true if the object or primitive is not `undefined`
`toBeNull()` returns true if the object or primitive is not `null`
`toBeTruthy()` returns true if the object or primitive evaluates to true
`toBeFalsy()` returns true if the object or primitive evaluates to false
`toContain()` returns true if an array or string contains the passed variable.
`toNotContain()` returns true if an array or string does not contain the passed variable.
#### Writing New Matchers #### Writing New Matchers
A Matcher has a method name, takes an expected value as it's only parameter, has access to the actual value in this, and then makes a call to this.report with true/false with a failure message. Here's the definition of `toEqual()`: We've provided a small set of matchers that cover many common situations. However, we recommend that you write custom matchers when you want to assert a more specific sort of expectation. Custom matchers help to document the intent of your specs, and can help to remove code duplication in your specs.
jasmine.Matchers.prototype.toEqual = function (expected) { It's extremely easy to create new matchers for your app. A matcher function receives the actual value as `this.actual`, and zero or more arguments may be passed in the function call. The function should return `true` if the actual value passes the matcher's requirements, and `false` if it does not.
return this.report((this.actual === expected),
'Expected ' + expected + ' but got ' + this.actual + '.'); Here's the definition of `toBeLessThan()`:
toBeLessThan: function(expected) {
return this.actual < expected;
}; };
Feel free to define your own matcher as needed in your code. If you'd like to add Matchers to Jasmine, please write tests. To add the matcher to your suite, call `this.addMatchers()` from within a `before` or `it` block. Call it with an object mapping matcher name to function:
beforeEach(function() {
this.addMatchers({
toBeVisible: function() { return this.actual.isVisible(); }
});
});
### Asynchronous Specs ### Asynchronous Specs