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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.

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