Updated with XCTest Swift3 syntax for shortest path

XCTest Success

Shortest Path (Unweighted)/ShortestPath.swift

@@ -2,8 +2,8 @@ func breadthFirstSearchShortestPath(graph: Graph, source: Node) -> Graph {
   let shortestPathGraph = graph.duplicate()
 
   var queue = Queue<Node>()
-  let sourceInShortestPathsGraph = shortestPathGraph.findNodeWithLabel(source.label)
-  queue.enqueue(sourceInShortestPathsGraph)
+  let sourceInShortestPathsGraph = shortestPathGraph.findNodeWithLabel(label: source.label)
+  queue.enqueue(element: sourceInShortestPathsGraph)
   sourceInShortestPathsGraph.distance = 0
 
   while let current = queue.dequeue() {

Shortest Path (Unweighted)/Tests/Graph.swift

@@ -1,7 +1,7 @@
 // MARK: - Edge
 
-public class Edge: Equatable {
-    public var neighbor: Node
+open class Edge: Equatable {
+    open var neighbor: Node
 
     public init(neighbor: Node) {
         self.neighbor = neighbor
@@ -15,31 +15,31 @@ public func == (lhs: Edge, rhs: Edge) -> Bool {
 
 // MARK: - Node
 
-public class Node: CustomStringConvertible, Equatable {
-    public var neighbors: [Edge]
+open class Node: CustomStringConvertible, Equatable {
+    open var neighbors: [Edge]
 
-    public private(set) var label: String
-    public var distance: Int?
-    public var visited: Bool
+    open fileprivate(set) var label: String
+    open var distance: Int?
+    open var visited: Bool
 
     public init(label: String) {
         self.label = label
         neighbors = []
         visited = false
     }
 
-    public var description: String {
+    open var description: String {
         if let distance = distance {
             return "Node(label: \(label), distance: \(distance))"
         }
         return "Node(label: \(label), distance: infinity)"
     }
 
-    public var hasDistance: Bool {
+    open var hasDistance: Bool {
         return distance != nil
     }
 
-    public func remove(edge: Edge) {
+    open func remove(_ edge: Edge) {
         neighbors.remove(at: neighbors.index { $0 === edge }!)
     }
 }
@@ -50,25 +50,25 @@ public func == (lhs: Node, rhs: Node) -> Bool {
 
 // MARK: - Graph
 
-public class Graph: CustomStringConvertible, Equatable {
-    public private(set) var nodes: [Node]
+open class Graph: CustomStringConvertible, Equatable {
+    open fileprivate(set) var nodes: [Node]
 
     public init() {
         self.nodes = []
     }
 
-    public func addNode(label: String) -> Node {
+    open func addNode(label: String) -> Node {
         let node = Node(label: label)
         nodes.append(node)
         return node
     }
 
-    public func addEdge(_ source: Node, neighbor: Node) {
+    open func addEdge(_ source: Node, neighbor: Node) {
         let edge = Edge(neighbor: neighbor)
         source.neighbors.append(edge)
     }
 
-    public var description: String {
+    open var description: String {
         var description = ""
 
         for node in nodes {
@@ -79,11 +79,11 @@ public class Graph: CustomStringConvertible, Equatable {
         return description
     }
 
-    public func findNodeWithLabel(label: String) -> Node {
+    open func findNodeWithLabel(label: String) -> Node {
         return nodes.filter { $0.label == label }.first!
     }
 
-    public func duplicate() -> Graph {
+    open func duplicate() -> Graph {
         let duplicated = Graph()
 
         for node in nodes {

Shortest Path (Unweighted)/Tests/Queue.swift

@@ -1,5 +1,5 @@
 public struct Queue<T> {
-  private var array: [T]
+  fileprivate var array: [T]
 
   public init() {
     array = []

Shortest Path (Unweighted)/Tests/Tests.xcodeproj/project.pbxproj

@@ -94,6 +94,7 @@
 				TargetAttributes = {
 					7B2BBC7F1C779D720067B71D = {
 						CreatedOnToolsVersion = 7.2;
+						LastSwiftMigration = 0820;
 					};
 				};
 			};
@@ -230,6 +231,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = swift.algorithm.club.Tests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 3.0;
 			};
 			name = Debug;
 		};
@@ -242,6 +244,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = swift.algorithm.club.Tests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 3.0;
 			};
 			name = Release;
 		};