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@ngdoc overview
@name Developer Guide: Angular Services: Creating Services
@description
While angular offers several useful services, for any nontrivial application you'll find it useful
to write your own custom services. To do this you begin by registering a service factory function
with a module either via the {@link api/angular.module Module#factory api} or directly
via the {@link api/angular.module.AUTO.$provide $provide} api inside of module config function.
All angular services participate in {@link dev_guide.di dependency injection (DI)} by registering
themselves with Angular's DI system (injector) under a `name` (id) as well as by declaring
dependencies which need to be provided for the factory function of the registered service. The
ability to swap dependencies for mocks/stubs/dummies in tests allows for services to be highly
testable.
# Registering Services
To register a service, you must have a module that this service will be part of. Afterwards, you
can register the service with the module either via the {@link api/angular.Module Module api} or
by using the {@link api/angular.module.AUTO.$provide $provide} service in the module configuration
function.The following pseudo-code shows both approaches:
Using the angular.Module api:
<pre>
var myModule = angular.module('myModule', []);
myModule.factory('serviceId', function() {
var shinyNewServiceInstance;
//factory function body that constructs shinyNewServiceInstance
return shinyNewServiceInstance;
});
</pre>
Using the $provide service:
<pre>
angular.module('myModule', require "testing_env"
require "version"
class VersionTests < Homebrew::TestCase
def test_accepts_objects_responding_to_to_str
value = stub(:to_str => "0.1")
assert_equal "0.1", Version.new(value).to_s
end
def test_raises_for_non_string_objects
assert_raises(TypeError) { Version.new(1.1) }
assert_raises(TypeError) { Version.new(1) }
assert_raises(TypeError) { Version.new(:symbol) }
end
def test_detected_from_url?
refute Version.new("1.0").detected_from_url?
assert Version::FromURL.new("1.0").detected_from_url?
end
end
class VersionTokenTests < Homebrew::TestCase
def test_inspect
assert_equal '#<Version::Token "foo">',
Version::Token.new("foo").inspect
end
def test_to_s
assert_equal "foo", Version::Token.new("foo").to_s
end
end
class VersionNullTokenTests < Homebrew::TestCase
def test_inspect
assert_equal "#<Version::NullToken>", Version::NullToken.new.inspect
end
def test_comparing_null
assert_operator Version::NullToken.new, :==, Version::NullToken.new
end
end
class VersionComparisonTests < Homebrew::TestCase
def test_comparing_regular_versions
assert_operator version("0.1"), :==, version("0.1.0")
assert_operator version("0.1"), :<, version("0.2")
assert_operator version("1.2.3"), :>, version("1.2.2")
assert_operator version("1.2.4"), :<, version("1.2.4.1")
assert_operator version("1.2.3"), :>, version("1.2.3alpha4")
assert_operator version("1.2.3"), :>, version("1.2.3beta2")
assert_operator version("1.2.3"), :>, version("1.2.3rc3")
assert_operator version("1.2.3"), :<, version("1.2.3-p34")
end
def test_HEAD
assert_operator version("HEAD"), :>, version("1.2.3")
assert_operator version("1.2.3"), :<, version("HEAD")
end
def test_comparing_alpha_versions
assert_operator version("1.2.3alpha4"), :==, version("1.2.3a4")
assert_operator version("1.2.3alpha4"), :==, version("1.2.3A4")
assert_operator version("1.2.3alpha4"), :>, version("1.2.3alpha3")
assert_operator version("1.2.3alpha4"), :<, version("1.2.3alpha5")
assert_operator version("1.2.3alpha4"), :<, version("1.2.3alpha10")
assert_operator version("1.2.3alpha4"), :<, version("1.2.3beta2")
assert_operator version("1.2.3alpha4"), :<, version("1.2.3rc3")
assert_operator version("1.2.3alpha4"), :<, version("1.2.3")
assert_operator version("1.2.3alpha4"), :<, version("1.2.3-p34")
end
def test_comparing_beta_versions
assert_operator version("1.2.3beta2"), :==, version("1.2.3b2")
assert_operator version("1.2.3beta2"), :==, version("1.2.3B2")
assert_operator version("1.2.3beta2"), :>, version("1.2.3beta1")
assert_operator version("1.2.3beta2"), :<, version("1.2.3beta3")
assert_operator version("1.2.3beta2"), :<, version("1.2.3beta10")
assert_operator version("1.2.3beta2"), :>, version("1.2.3alpha4")
assert_operator version("1.2.3beta2"), :<, version("1.2.3rc3")
assert_operator version("1.2.3beta2"), :<, version("1.2.3")
assert_operator version("1.2.3beta2"), :<, version("1.2.3-p34")
end
def test_comparing_rc_versions
assert_operator version("1.2.3rc3"), :==, version("1.2.3RC3")
assert_operator version("1.2.3rc3"), :>
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