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Mocking library

F# Mocking library with a fluent interface Moq users should find familiar. Generate mocks for interfaces and abstract types. Supports mocking methods, properties and events. Specify arguments as wildcards or values to match. Define results as values, computed values or exceptions.

Mock fluent interface

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/// Generic mock type over abstract types and interfaces
type Mock<'TAbstract when 'TAbstract : not struct> internal (calls) =
    /// Abstract type
    let abstractType = typeof<'TAbstract>
    /// Converts argument expressions to Arg array
    let toArgs args =
        let hasAttribute a (mi:MethodInfo) = mi.GetCustomAttributes(a, true).Length > 0
        [|for arg in args ->
            match arg with
            | Value(v,t) | Coerce(Value(v,t),_) -> Arg(v)
            | PropertyGet(None, pi, []) -> pi.GetValue(null, [||]) |> Arg
            | Call(_, mi, _) when hasAttribute typeof<WildcardAttribute> mi -> Any
            | _ -> raise <| NotSupportedException(arg.ToString()) |]
    /// Converts expression to a tuple of MethodInfo and Arg array
    let toCall = function
        | Call(Some(x), mi, args) when x.Type = abstractType -> 
            mi, toArgs args
        | PropertyGet(Some(x), pi, args) when x.Type = abstractType -> 
            pi.GetGetMethod(), toArgs args
        | PropertySet(Some(x), pi, args, value) when x.Type = abstractType -> 
            pi.GetSetMethod(), toArgs args
        | expr -> raise <| NotSupportedException(expr.ToString())
    /// Converts expression to corresponding event Add and Remove handlers
    let toHandlers = function
        | Call(None, mi, [Lambda(_,Call(Some(x),addHandler,_));
                          Lambda(_,Call(Some(_),removeHandler,_));_]) 
                          when x.Type = abstractType -> 
            addHandler, removeHandler
        | expr -> raise <| NotSupportedException(expr.ToString())
    /// Constructs mock builder
    new () = Mock([])
    /// Specifies a method or property of the abstract type as a quotation
    member this.Setup(f:'TAbstract -> Expr<'TReturnValue>) =
        let default' = Unchecked.defaultof<'TAbstract>
        let call = toCall (f default')
        ResultBuilder<'TAbstract,'TReturnValue>(call,calls)
    /// Specifies an event of the abstract type as a quotation
    member this.SetupEvent(f:'TAbstract -> Expr<'TEvent>) =
        let default' = Unchecked.defaultof<'TAbstract>
        let handlers = toHandlers (f default')
        EventBuilder<'TAbstract,'TEvent>(handlers,calls)
    /// Creates an instance of the abstract type
    member this.Create() = mock<'TAbstract>(calls)
/// Generic builder for specifying method or property results
and ResultBuilder<'TAbstract,'TReturnValue when 'TAbstract : not struct> 
    internal (call, calls) =
    let mi, args = call
    /// Specifies the return value of a method or property
    member this.Returns(value:'TReturnValue) =
        let result = 
            if typeof<'TReturnValue> = typeof<unit> then Unit 
            else ReturnValue(value)
        Mock<'TAbstract>((mi, (args, result))::calls)
    /// Specifies a computed return value of a method or property
    member this.Returns(f:unit -> 'TReturnVaue) =
        Mock<'TAbstract>((mi, (args, ReturnFunc(f)))::calls)
    /// Calls the specified function to compute the return value
    [<RequiresExplicitTypeArguments>]
    member this.Calls<'TArgs>(f:'TArgs -> 'TReturnValue) =
        Mock<'TAbstract>((mi, (args, Call(f)))::calls)
    /// Specifies the exception a method raises
    [<RequiresExplicitTypeArguments>]
    member this.Raises<'TException when 'TException : (new : unit -> 'TException) 
                                   and  'TException :> exn>() =
        Mock<'TAbstract>((mi, (args, Raise(typeof<'TException>)))::calls)
/// Generic builder for specifying event values
and EventBuilder<'TAbstract,'TEvent when 'TAbstract : not struct> 
    internal (handlers, calls) =
    let add, remove = handlers
    /// Specifies the published event value
    member this.Publishes(value:'TEvent) =
        Mock<'TAbstract>((add, ([|Any|], Handler("AddHandler",value)))::
                         (remove, ([|Any|], Handler("RemoveHandler",value)))::
                         calls)

It.IsAny argument

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[<Sealed>]
type It private () =
    /// Marks argument as matching any value
    [<Wildcard>] static member IsAny<'TArg>() = Unchecked.defaultof<'TArg>

[<AutoOpen;CompilationRepresentation(CompilationRepresentationFlags.ModuleSuffix)>]
module It =
    /// Marks argument as matching any value
    let [<Wildcard>] inline any () : 'TArg = It.IsAny()

Method Example

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    let mock =
        Mock<System.Collections.IList>()
            .Setup(fun x -> <@ x.Contains(any()) @>).Returns(true)
            .Create()
    mock.Contains("Anything")

Property Example

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    let mock =
        Mock<System.Collections.IList>()
            .Setup(fun x -> <@ x.Count @>).Returns(1)
            .Create()
    mock.Count = 1

Computed Property Example

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    let counter = ref 0
    let mock =
        Mock<System.Collections.IList>()
            .Setup(fun x -> <@ x.Count @>).Returns(fun () -> incr counter; !counter)
            .Create()
    mock.Count = 1
    mock.Count = 2

Item Get Example

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    let mock =
        Mock<System.Collections.Generic.IList<double>>()
            .Setup(fun x -> <@ x.Item( -1  ) @>).Raises<IndexOutOfRangeException>()
            .Setup(fun x -> <@ x.Item(any()) @>).Returns(-1.0)
            .Create()
    mock.[0] =  0.0
    mock.[1] = -1.0

Called Example

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    let mutable called = false
    let instance =
        Mock<System.Collections.Generic.IList<string>>()
            .Setup(fun x -> <@ x.Insert(any(), any()) @>)
                .Calls<int * string>(fun (index,item) -> called <- true)
            .Create()
    instance.Insert(6, "Six")
    called

Event Example

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    let event = Event<_,_>()
    let mock =
        Mock<System.ComponentModel.INotifyPropertyChanged>()
            .SetupEvent(fun x -> <@ x.PropertyChanged @>).Publishes(event.Publish)
            .Create()
    let triggered = ref false
    mock.PropertyChanged.Add(fun x -> triggered := true)
    event.Trigger(mock, System.ComponentModel.PropertyChangedEventArgs("PropertyName"))
    triggered.Value
Multiple items
type Mock<'TAbstract (requires reference type)> =
  new : unit -> Mock<'TAbstract>
  internal new : calls:(MethodInfo * (Arg [] * Result)) list -> Mock<'TAbstract>
  member Create : unit -> 'TAbstract
  member Setup : f:('TAbstract -> Expr<'TReturnValue>) -> ResultBuilder<'TAbstract,'TReturnValue>
  member SetupEvent : f:('TAbstract -> Expr<'TEvent>) -> EventBuilder<'TAbstract,'TEvent>

Full name: Script.Mock<_>


 Generic mock type over abstract types and interfaces

--------------------
new : unit -> Mock<'TAbstract>


 Constructs mock builder
internal new : calls:(MethodInfo * (Arg [] * Result)) list -> Mock<'TAbstract>
val not : value:bool -> bool

Full name: Microsoft.FSharp.Core.Operators.not
val calls : (MethodInfo * (Arg [] * Result)) list
val abstractType : Type


 Abstract type
val typeof<'T> : Type

Full name: Microsoft.FSharp.Core.Operators.typeof
val toArgs : (seq<#Expr> -> Arg [])


 Converts argument expressions to Arg array
val args : seq<#Expr>
val hasAttribute : (Type -> MethodInfo -> bool)
val a : Type
val mi : MethodInfo
type MethodInfo =
  inherit MethodBase
  member Equals : obj:obj -> bool
  member GetBaseDefinition : unit -> MethodInfo
  member GetGenericArguments : unit -> Type[]
  member GetGenericMethodDefinition : unit -> MethodInfo
  member GetHashCode : unit -> int
  member MakeGenericMethod : [<ParamArray>] typeArguments:Type[] -> MethodInfo
  member MemberType : MemberTypes
  member ReturnParameter : ParameterInfo
  member ReturnType : Type
  member ReturnTypeCustomAttributes : ICustomAttributeProvider

Full name: System.Reflection.MethodInfo
MemberInfo.GetCustomAttributes(inherit: bool) : obj []
MemberInfo.GetCustomAttributes(attributeType: Type, inherit: bool) : obj []
val arg : #Expr
Multiple items
active recognizer Value: Expr -> (obj * Type) option

Full name: Microsoft.FSharp.Quotations.Patterns.( |Value|_| )

--------------------
type internal Value = obj

Full name: Script.CodeEmit.Value


 Boxed value
val v : obj
val t : Type
active recognizer Coerce: Expr -> (Expr * Type) option

Full name: Microsoft.FSharp.Quotations.Patterns.( |Coerce|_| )
Multiple items
union case Arg.Arg: Value -> Arg

--------------------
type internal Arg =
  | Any
  | Arg of Value

Full name: Script.CodeEmit.Arg


 Method argument type
active recognizer PropertyGet: Expr -> (Expr option * PropertyInfo * Expr list) option

Full name: Microsoft.FSharp.Quotations.Patterns.( |PropertyGet|_| )
union case Option.None: Option<'T>
val pi : PropertyInfo
PropertyInfo.GetValue(obj: obj, index: obj []) : obj
PropertyInfo.GetValue(obj: obj, invokeAttr: BindingFlags, binder: Binder, index: obj [], culture: Globalization.CultureInfo) : obj
Multiple items
union case Result.Call: Func -> Result

--------------------
active recognizer Call: Expr -> (Expr option * MethodInfo * Expr list) option

Full name: Microsoft.FSharp.Quotations.Patterns.( |Call|_| )
Multiple items
type WildcardAttribute =
  inherit Attribute
  new : unit -> WildcardAttribute

Full name: Script.WildcardAttribute


 Wildcard attribute

--------------------
new : unit -> WildcardAttribute
union case Arg.Any: Arg
val raise : exn:Exception -> 'T

Full name: Microsoft.FSharp.Core.Operators.raise
Multiple items
type NotSupportedException =
  inherit SystemException
  new : unit -> NotSupportedException + 2 overloads

Full name: System.NotSupportedException

--------------------
NotSupportedException() : unit
NotSupportedException(message: string) : unit
NotSupportedException(message: string, innerException: exn) : unit
Object.ToString() : string
member Expr.ToString : full:bool -> string
val toCall : (Expr -> MethodInfo * Arg [])


 Converts expression to a tuple of MethodInfo and Arg array
union case Option.Some: Value: 'T -> Option<'T>
val x : Expr
val args : Expr list
property Expr.Type: Type
PropertyInfo.GetGetMethod() : MethodInfo
PropertyInfo.GetGetMethod(nonPublic: bool) : MethodInfo
active recognizer PropertySet: Expr -> (Expr option * PropertyInfo * Expr list * Expr) option

Full name: Microsoft.FSharp.Quotations.Patterns.( |PropertySet|_| )
val value : Expr
PropertyInfo.GetSetMethod() : MethodInfo
PropertyInfo.GetSetMethod(nonPublic: bool) : MethodInfo
val expr : Expr
val toHandlers : (Expr -> MethodInfo * MethodInfo)


 Converts expression to corresponding event Add and Remove handlers
active recognizer Lambda: Expr -> (Var * Expr) option

Full name: Microsoft.FSharp.Quotations.Patterns.( |Lambda|_| )
val addHandler : MethodInfo
val removeHandler : MethodInfo
val this : Mock<'TAbstract> (requires reference type)
member Mock.Setup : f:('TAbstract -> Expr<'TReturnValue>) -> ResultBuilder<'TAbstract,'TReturnValue>

Full name: Script.Mock`1.Setup


 Specifies a method or property of the abstract type as a quotation
val f : ('TAbstract -> Expr<'TReturnValue>) (requires reference type)
Multiple items
type Expr =
  override Equals : obj:obj -> bool
  member GetFreeVars : unit -> seq<Var>
  member Substitute : substitution:(Var -> Expr option) -> Expr
  member ToString : full:bool -> string
  member CustomAttributes : Expr list
  member Type : Type
  static member AddressOf : target:Expr -> Expr
  static member AddressSet : target:Expr * value:Expr -> Expr
  static member Application : functionExpr:Expr * argument:Expr -> Expr
  static member Applications : functionExpr:Expr * arguments:Expr list list -> Expr
  ...

Full name: Microsoft.FSharp.Quotations.Expr

--------------------
type Expr<'T> =
  inherit Expr
  member Raw : Expr

Full name: Microsoft.FSharp.Quotations.Expr<_>
val default' : 'TAbstract (requires reference type)
module Unchecked

from Microsoft.FSharp.Core.Operators
val defaultof<'T> : 'T

Full name: Microsoft.FSharp.Core.Operators.Unchecked.defaultof
val call : MethodInfo * Arg []
Multiple items
type ResultBuilder<'TAbstract,'TReturnValue (requires reference type)> =
  internal new : call:(MethodInfo * Arg []) * calls:(MethodInfo * (Arg [] * Result)) list -> ResultBuilder<'TAbstract,'TReturnValue>
  member Calls : f:('TArgs -> 'TReturnValue) -> Mock<'TAbstract>
  member Raises : unit -> Mock<'TAbstract>
  member Returns : value:'TReturnValue -> Mock<'TAbstract>
  member Returns : f:(unit -> 'TReturnVaue) -> Mock<'TAbstract>

Full name: Script.ResultBuilder<_,_>


 Generic builder for specifying method or property results

--------------------
internal new : call:(MethodInfo * Arg []) * calls:(MethodInfo * (Arg [] * Result)) list -> ResultBuilder<'TAbstract,'TReturnValue>
member Mock.SetupEvent : f:('TAbstract -> Expr<'TEvent>) -> EventBuilder<'TAbstract,'TEvent>

Full name: Script.Mock`1.SetupEvent


 Specifies an event of the abstract type as a quotation
val f : ('TAbstract -> Expr<'TEvent>) (requires reference type)
val handlers : MethodInfo * MethodInfo
Multiple items
type EventBuilder<'TAbstract,'TEvent (requires reference type)> =
  internal new : handlers:(MethodInfo * MethodInfo) * calls:(MethodInfo * (Arg [] * Result)) list -> EventBuilder<'TAbstract,'TEvent>
  member Publishes : value:'TEvent -> Mock<'TAbstract>

Full name: Script.EventBuilder<_,_>


 Generic builder for specifying event values

--------------------
internal new : handlers:(MethodInfo * MethodInfo) * calls:(MethodInfo * (Arg [] * Result)) list -> EventBuilder<'TAbstract,'TEvent>
member Mock.Create : unit -> 'TAbstract

Full name: Script.Mock`1.Create


 Creates an instance of the abstract type
val internal mock : calls:(MethodInfo * (Arg [] * Result)) list -> 'TAbstract (requires reference type)

Full name: Script.CodeEmit.mock


 Builds a mock from the specified calls
val args : Arg []
val this : ResultBuilder<'TAbstract,'TReturnValue> (requires reference type)
member ResultBuilder.Returns : value:'TReturnValue -> Mock<'TAbstract>

Full name: Script.ResultBuilder`2.Returns


 Specifies the return value of a method or property
val value : 'TReturnValue
val result : Result
type unit = Unit

Full name: Microsoft.FSharp.Core.unit
union case Result.Unit: Result
union case Result.ReturnValue: Value -> Result
member ResultBuilder.Returns : f:(unit -> 'TReturnVaue) -> Mock<'TAbstract>

Full name: Script.ResultBuilder`2.Returns


 Specifies a computed return value of a method or property
val f : (unit -> 'TReturnVaue)
union case Result.ReturnFunc: Func -> Result
Multiple items
type RequiresExplicitTypeArgumentsAttribute =
  inherit Attribute
  new : unit -> RequiresExplicitTypeArgumentsAttribute

Full name: Microsoft.FSharp.Core.RequiresExplicitTypeArgumentsAttribute

--------------------
new : unit -> RequiresExplicitTypeArgumentsAttribute
member ResultBuilder.Calls : f:('TArgs -> 'TReturnValue) -> Mock<'TAbstract>

Full name: Script.ResultBuilder`2.Calls


 Calls the specified function to compute the return value
val f : ('TArgs -> 'TReturnValue)
member ResultBuilder.Raises : unit -> Mock<'TAbstract>

Full name: Script.ResultBuilder`2.Raises
type exn = Exception

Full name: Microsoft.FSharp.Core.exn
union case Result.Raise: Type -> Result
val add : MethodInfo
val remove : MethodInfo
val this : EventBuilder<'TAbstract,'TEvent> (requires reference type)
member EventBuilder.Publishes : value:'TEvent -> Mock<'TAbstract>

Full name: Script.EventBuilder`2.Publishes


 Specifies the published event value
val value : 'TEvent
Multiple items
union case Result.Handler: string * PublishedEvent -> Result

--------------------
type Handler<'T> =
  delegate of obj * 'T -> unit

Full name: Microsoft.FSharp.Control.Handler<_>
Multiple items
type SealedAttribute =
  inherit Attribute
  new : unit -> SealedAttribute
  new : value:bool -> SealedAttribute
  member Value : bool

Full name: Microsoft.FSharp.Core.SealedAttribute

--------------------
new : unit -> SealedAttribute
new : value:bool -> SealedAttribute
Multiple items
type It =
  private new : unit -> It
  static member IsAny : unit -> 'TArg

Full name: Script.It

--------------------
private new : unit -> It
static member It.IsAny : unit -> 'TArg

Full name: Script.It.IsAny


 Marks argument as matching any value
Multiple items
type AutoOpenAttribute =
  inherit Attribute
  new : unit -> AutoOpenAttribute
  new : path:string -> AutoOpenAttribute
  member Path : string

Full name: Microsoft.FSharp.Core.AutoOpenAttribute

--------------------
new : unit -> AutoOpenAttribute
new : path:string -> AutoOpenAttribute
Multiple items
type CompilationRepresentationAttribute =
  inherit Attribute
  new : flags:CompilationRepresentationFlags -> CompilationRepresentationAttribute
  member Flags : CompilationRepresentationFlags

Full name: Microsoft.FSharp.Core.CompilationRepresentationAttribute

--------------------
new : flags:CompilationRepresentationFlags -> CompilationRepresentationAttribute
type CompilationRepresentationFlags =
  | None = 0
  | Static = 1
  | Instance = 2
  | ModuleSuffix = 4
  | UseNullAsTrueValue = 8
  | Event = 16

Full name: Microsoft.FSharp.Core.CompilationRepresentationFlags
CompilationRepresentationFlags.ModuleSuffix: CompilationRepresentationFlags = 4
val any : unit -> 'TArg

Full name: Script.ItModule.any


 Marks argument as matching any value
type It =
  private new : unit -> It
  static member IsAny : unit -> 'TArg

Full name: Script.It
static member It.IsAny : unit -> 'TArg


 Marks argument as matching any value
val mock : Collections.IList

Full name: Script.Method Example.mock
namespace System
namespace System.Collections
type IList =
  member Add : value:obj -> int
  member Clear : unit -> unit
  member Contains : value:obj -> bool
  member IndexOf : value:obj -> int
  member Insert : index:int * value:obj -> unit
  member IsFixedSize : bool
  member IsReadOnly : bool
  member Item : int -> obj with get, set
  member Remove : value:obj -> unit
  member RemoveAt : index:int -> unit

Full name: System.Collections.IList
val x : Collections.IList
Collections.IList.Contains(value: obj) : bool
val mock : Collections.IList

Full name: Script.Property Example.mock
property Collections.ICollection.Count: int
val counter : int ref

Full name: Script.Computed Property Example.counter
Multiple items
val ref : value:'T -> 'T ref

Full name: Microsoft.FSharp.Core.Operators.ref

--------------------
type 'T ref = Ref<'T>

Full name: Microsoft.FSharp.Core.ref<_>
val mock : Collections.IList

Full name: Script.Computed Property Example.mock
val incr : cell:int ref -> unit

Full name: Microsoft.FSharp.Core.Operators.incr
val mock : Collections.Generic.IList<double>

Full name: Script.Item Get Example.mock
namespace System.Collections.Generic
type IList<'T> =
  member IndexOf : item:'T -> int
  member Insert : index:int * item:'T -> unit
  member Item : int -> 'T with get, set
  member RemoveAt : index:int -> unit

Full name: System.Collections.Generic.IList<_>
Multiple items
val double : value:'T -> float (requires member op_Explicit)

Full name: Microsoft.FSharp.Core.ExtraTopLevelOperators.double

--------------------
type double = Double

Full name: Microsoft.FSharp.Core.double
val x : Collections.Generic.IList<double>
property Collections.Generic.IList.Item: int -> double
Multiple items
type IndexOutOfRangeException =
  inherit SystemException
  new : unit -> IndexOutOfRangeException + 2 overloads

Full name: System.IndexOutOfRangeException

--------------------
IndexOutOfRangeException() : unit
IndexOutOfRangeException(message: string) : unit
IndexOutOfRangeException(message: string, innerException: exn) : unit
val mutable called : bool

Full name: Script.Called Example.called
val instance : Collections.Generic.IList<string>

Full name: Script.Called Example.instance
Multiple items
val string : value:'T -> string

Full name: Microsoft.FSharp.Core.Operators.string

--------------------
type string = String

Full name: Microsoft.FSharp.Core.string
val x : Collections.Generic.IList<string>
Collections.Generic.IList.Insert(index: int, item: string) : unit
Multiple items
val int : value:'T -> int (requires member op_Explicit)

Full name: Microsoft.FSharp.Core.Operators.int

--------------------
type int = int32

Full name: Microsoft.FSharp.Core.int

--------------------
type int<'Measure> = int

Full name: Microsoft.FSharp.Core.int<_>
val index : int
val item : string
val event : Event<ComponentModel.PropertyChangedEventHandler,ComponentModel.PropertyChangedEventArgs>

Full name: Script.Event Example.event
Multiple items
module Event

from Microsoft.FSharp.Control

--------------------
type Event<'T> =
  new : unit -> Event<'T>
  member Trigger : arg:'T -> unit
  member Publish : IEvent<'T>

Full name: Microsoft.FSharp.Control.Event<_>

--------------------
type Event<'Delegate,'Args (requires delegate and 'Delegate :> Delegate)> =
  new : unit -> Event<'Delegate,'Args>
  member Trigger : sender:obj * args:'Args -> unit
  member Publish : IEvent<'Delegate,'Args>

Full name: Microsoft.FSharp.Control.Event<_,_>

--------------------
new : unit -> Event<'T>

--------------------
new : unit -> Event<'Delegate,'Args>
val mock : ComponentModel.INotifyPropertyChanged

Full name: Script.Event Example.mock
namespace System.ComponentModel
type INotifyPropertyChanged =
  event PropertyChanged : PropertyChangedEventHandler

Full name: System.ComponentModel.INotifyPropertyChanged
val x : ComponentModel.INotifyPropertyChanged
event ComponentModel.INotifyPropertyChanged.PropertyChanged: IEvent<ComponentModel.PropertyChangedEventHandler,ComponentModel.PropertyChangedEventArgs>
property Event.Publish: IEvent<ComponentModel.PropertyChangedEventHandler,ComponentModel.PropertyChangedEventArgs>
val triggered : bool ref

Full name: Script.Event Example.triggered
member IObservable.Add : callback:('T -> unit) -> unit
val x : ComponentModel.PropertyChangedEventArgs
member Event.Trigger : sender:obj * args:'Args -> unit
Multiple items
type PropertyChangedEventArgs =
  inherit EventArgs
  new : propertyName:string -> PropertyChangedEventArgs
  member PropertyName : string

Full name: System.ComponentModel.PropertyChangedEventArgs

--------------------
ComponentModel.PropertyChangedEventArgs(propertyName: string) : unit
property Ref.Value: bool
Raw view Test code New version

More information

Link:http://fssnip.net/fi
Posted:12 years ago
Author:Phillip Trelford
Tags: testing , quotations

This web site is created using F# and Suave web server. It is hosted on Azure and the source code is on GitHub. Contributions are welcome!

The first version of fssnip.net has been created by @tomaspetricek back in 2010. This web site is a new, open-source and contribution-friendly version.