Fixes Wolox#10

ReactiveArray#observableCount was always sending 0 as the first
value even in the case were the array was initialized with a
non-empty array.

Author: Guido Marucci Blas

ReactiveArray/ReactiveArray.swift

@@ -40,7 +40,7 @@ public final class ReactiveArray<T>: CollectionType, MutableCollectionType, Debu
         return  appendCurrentElements |> concat(forwardOperations)
     }
 
-    private let _mutableCount = MutableProperty<Int>(0)
+    private let _mutableCount: MutableProperty<Int>
     public let observableCount:PropertyOf<Int>
 
     public var isEmpty: Bool {
@@ -79,6 +79,7 @@ public final class ReactiveArray<T>: CollectionType, MutableCollectionType, Debu
 
     public init(elements:[T]) {
         _elements = elements
+        _mutableCount = MutableProperty(elements.count)
         observableCount = PropertyOf(_mutableCount)
 
         _signal.observe { [unowned self](operation) in

ReactiveArrayTests/ReactiveArraySpec.swift

@@ -396,11 +396,21 @@ class ReactiveArraySpec: QuickSpec {
 
             beforeEach {
                 countBeforeOperation = array.count
-                producer = array.observableCount.producer |> skip(1)
+                producer = array.observableCount.producer
+            }
+            
+            it("returns the initial amount of elements in the array") {
+                producer.start(next: { count in
+                    expect(count).to(equal(countBeforeOperation))
+                })
             }
 
             context("when an insert operation is executed") {
 
+                beforeEach {
+                    producer = producer |> skip(1)
+                }
+                
                 it("does not update the count") {
                     waitUntil { done in
                         producer
@@ -421,6 +431,10 @@ class ReactiveArraySpec: QuickSpec {
 
             context("when an append operation is executed") {
 
+                beforeEach {
+                    producer = producer |> skip(1)
+                }
+                
                 it("updates the count") {
                     waitUntil { done in
                         producer |> start(next: { count in
@@ -436,6 +450,10 @@ class ReactiveArraySpec: QuickSpec {
 
             context("when a delete operation is executed") {
 
+                beforeEach {
+                    producer = producer |> skip(1)
+                }
+                
                 it("updates the count") {
                     waitUntil { done in
                         producer |> start(next: { count in