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https://github.com/railsware/Sleipnir

BDD-style framework for Swift
https://github.com/railsware/Sleipnir

Last synced: 6 days ago
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BDD-style framework for Swift

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# Sleipnir



Sleipnir is a BDD-style framework for Swift. Sleipnir is highly inspired by [Cedar](https://github.com/pivotal/cedar). 

Also

> In Norse mythology, [Sleipnir](http://en.wikipedia.org/wiki/Sleipnir) is Odin's steed, is the child of Loki and Svaðilfari, is described as the best of all horses, and is sometimes ridden to the location of Hel. 

  

```swift

class SampleSpec : SleipnirSpec {

    var spec : () = describe("Horse") {

        context("usual") {

            it("is not awesome") {

                let usualHorse = UsualHorse()

                usualHorse.legsCount.should.equal(4)

                expect(usualHorse.isAwesome()).to(beFalse())

            }

        }

        

        context("Sleipnir") {

            it("is awesome") {

                let sleipnirHorse = Sleipnir()

                sleipnirHorse.legsCount.should.equal(8)

                expect(sleipnirHorse.isAwesome()).to(beTrue())

            }

        }

    }

}

```

## Core principles



* Sleipnir is not dependent of ```NSObject```, it is pure Swift BDD testing framework

* Sleipnir is not using ```XCTest```

* Sleipnir has nice command line output and support for custom test reporters

* Other features, like seeded random tests invocation, focused and excluded examples/groups, etc.



## Installation



#### Manually (preferred way)



1. Add Sleipnir as a submodule: `git submodule add https://github.com/railsware/sleipnir ThirdParty/Sleipnir`

2. Drag'n'drop `Sleipnir.xcodeproj` to your test target

3. Link `Sleipnir.framework`

4. Start writing specs!



#### Manually (from XCode Project template)



1. Clone `Sleipnir` repo `git clone https://github.com/railsware/sleipnir /tmp/Sleipnir`

2. Execute the following command `cd /tmp/Sleipnir && make install_templates`



The command will install templates for OSX and iOS projects and Spec file template as well.



**Note:** this way you should manage framework updates on your own. Try to reinstall templates before creating new project/target from "old" ones



#### Via CocoaPods



You can install statically built `Sleipnir.framework` into you project simply by adding it to the `Podfile`



```

pod 'Sleipnir'

```



**Note: it is experimental way**


**Current build does not work on iPhone Simulator, but works for OSX and iOS Devices**



## Usage sample



See [LibrarySpec](https://github.com/railsware/Sleipnir/blob/master/Sample/Sample/LibrarySpec.swift) file in [Sample](https://github.com/railsware/Sleipnir/tree/master/Sample/Sample) project.



## Writing specs



All spec classes should inherit from `SleipnirSpec`.



Root ExampleGroups in a spec should be assigned to some void variable. This allows specs to initialize correctly:

```swift

import Sleipnir



class SomeSpec : SleipnirSpec {

 

    let someSpec : () = describe("Some spec") {

        it("should pass") {

            expect(1).to(equal(1))

        }

    }

    

}

```

## Running specs



In order to run your specs you should invoke `Runner.run()` from the `main.swift` of your test target.



The default test runner will produce the following command line output, indicating all the failures and some meta information about each failure:

```

Running With Random Seed: 1234



.....F..



FAILURE Some spec should pass:

/Path/To/Your/Specs/TestSpec.swift:16 Expected <1> to equal <2>



Finished in 0.0075 seconds



8 examples, 1 failures

```



#### Seeded random specs run



All examples would run in random order with the random seed specified in output. If you would like to re-run tests in the same order you should pass a seed to `run()` method:

```swift

Runner.run(seed: 1234)

```



## Examples and ExampleGroups



ExampleGroups are created with `describe` or `context` keywords.

Within the block passed to ExampleGroup you can declare examples using the `it` keyword.



ExampleGroups can be nested in order to create clean structure of your tests.



Under the hood `describe` method creates an instance of `ExampleGroup` and evaluates the block passed to it. Blocks passed to examples are evaluated dynamically during the test execution.



## Setup/Teardown code



Sleipnir supports some hooks to execute before or after examples. This allows to share some setup/teardown code between examples.



`beforeEach` block will be executed before each example in the current group and all nested groups.



`afterEach` block will be executed after each example.



```swift

class SomeSpec : SleipnirSpec {

 

    let someSpec : () = describe("Some spec") {

        var someArray: [Int]?

        beforeEach {

            someArray = [1, 2, 3]

        }

        

        afterEach {

            someArray = nil

        }

        

        it("should pass") {

            expect(someArray).toNot(beNil())

            expect(someArray).to(contain(3))

        }

    }

    

}

```

You can also specify global setup/teardown blocks using `beforeAll` and `afterAll` keywords. 

They will run once before or after all examples in the current group and all the nested groups.



## Focused and excluded specs



You can specify examples and example groups to be focused by placing `f` letter before declaration: `fdescribe`, `fcontext`, `fit`. In this case the spec runner will only run focused examples/example groups and ignore all the others.



You can also mark an example or example group as `pending`. It won't run but will be printed along with the test results.
 

To mark something as `pending` add an `x` letter before declaration: `xdescribe`, `xcontext`, `xit`.


Example can also be marked as `pending` by passing `PENDING` instead of spec block: 

```swift

it("is pending", PENDING)

```

## Shared example groups



Sleipnir supports extracting common specs through shared example groups.


They can include any number of `it`, `context`, `describe`, `before` and `after` blocks.


You can pass example-specific state into the shared example group through `sharedContext` dictionary.

```swift

var nonNilObject : () =

    sharedExamplesFor("a non-nil object") { (sharedContext : SharedContext) in

        var object: AnyObject?

        beforeEach {

            object = sharedContext()["object"]

        }

        

        it("should not be nil") {

            expect(object).toNot(beNil())

        }

    }



var spec : () = context("A non-nil object") {

    let someObject: String = "Some Object"

    itShouldBehaveLike("a non-nil object", { ["object" : someObject] })

}

```



If you don't need any context, you can use closures without parameters:

```swift

sharedExamplesFor("some awesome stuff") {

    it("should be awesome") {

        //...

    }

}



describe("Some stuff") {

    itShouldBehaveLike("some awesome stuff")

}

```



## Expectations



Sleipnir supports defining expectations using `expect(someValue/expession).to(SomeMatcher)` syntax.

```swift

expect(true).to(beTrue())

```

`expect` method supports passing values or a block of code in a closure:

```swift

expect {

    var x = 1

    x++

    return x

}.to(equal(2))

```



### `Should` syntax



In addition to the `expect` syntax, Sleipnir supports the `should` syntax:

```swift

actual.should.equal(expected)

[1, 2, 3].shouldNot.contain(4)

```

[See detailed information on the `should` syntax and its usage](https://github.com/railsware/Sleipnir/blob/master/ShouldSyntax.md)



## Available matchers



##### Equal

Values must be [`Equatable`](https://developer.apple.com/library/prerelease/ios/documentation/General/Reference/SwiftStandardLibraryReference/Equatable.html), [`Comparable`](https://developer.apple.com/library/prerelease/ios/documentation/General/Reference/SwiftStandardLibraryReference/Comparable.html) or derive from `NSObject`.

```swift

expect([1,2,3]).to(equal([1,2,3]))

expect("some string").toNot(equal("another string"))

expect(1) == 1

```



##### BeNil

```swift

expect(nil).to(beNil())

expect("some string").toNot(beNil())

```



##### BeTrue/BeFalse

```swift

expect(true).to(beTrue())

expect(false).to(beFalse())

```



##### BeGreaterThan/BeLessThan

Values must be [`Comparable`](https://developer.apple.com/library/prerelease/ios/documentation/General/Reference/SwiftStandardLibraryReference/Comparable.html).

```swift

expect(3).to(beGreaterThan(1))

expect(3) > 1



expect(1).to(beLessThan(3))

expect(1) < 3

```



##### BeGreaterThanOrEqualTo/BeLessThanOrEqualTo

Values must be [`Comparable`](https://developer.apple.com/library/prerelease/ios/documentation/General/Reference/SwiftStandardLibraryReference/Comparable.html).

```swift

expect(3).to(beGreaterThanOrEqualTo(1))

expect(3) >= 1

expect(1) >= 1



expect(1).to(beLessThanOrEqualTo(3))

expect(1) <= 3

expect(1) <= 1

```



##### Collections/String matchers

Sleipnir supports some matchers on collections and strings:



##### Contain

Matches if an item is in the container. Supports Swift collections with [`Equatable`](https://developer.apple.com/library/prerelease/ios/documentation/General/Reference/SwiftStandardLibraryReference/Equatable.html) elements, `NSArrays`, `NSSets` and `Strings`.

```swift

expect([1,2,3]).to(contain(1))

expect("some string").toNot(contain("another"))

```



##### BeginWith/EndWith

Matches if the container begins/ends with the specified element. Supports Swift collections with `Equatable` elements, `NSArrays` and `Strings`.

```swift

expect([1,2,3]).to(beginWith(1))

expect("some string").to(endWith("string"))

```



##### BeEmpty

Matches if a container is empty.

```swift

expect("").to(beEmpty())

expect([1,2,3]).toNot(beEmpty())

```



## TODO



- [x] Ease of distribution (CocoaPods probably)

- [x] XCode templates

- [x] Shared examples support

- [x] ```should``` syntax support

- [ ] asynchronous matchers (```will```, ```willNot```, ```after```)



## Who uses Sleipnir



 - [SGL](https://github.com/AlexDenisov/sgl) - Swift Generic Library



## Contributing



Please read the [Contributor Guide](https://github.com/railsware/Sleipnir/blob/master/CONTRIBUTING.md).



## License



Licensed under MIT license. See the [LICENSE](https://github.com/railsware/Sleipnir/blob/master/LICENSE) file for details.