Fix test warnings and tests

Author: adamyanalunas

SwiftStateTests/HierarchicalStateMachineTests.swift

@@ -160,7 +160,6 @@ class HierarchicalStateMachineTests: _TestCase
     func testAddHandler()
     {
         let mainMachine = self.mainMachine!
-        let sub1Machine = self.sub1Machine!
 
         var didPass = false
 

SwiftStateTests/StateMachineChainTests.swift

@@ -80,8 +80,6 @@ class StateMachineChainTests: _TestCase
     {
         let machine = StateMachine<MyState, String>(state: .State0)
 
-        var invokeCount = 0
-        
         // add 0 => 1 => 2
         machine.addRouteChain(.State0 => .State1 => .State2) { context in
             XCTFail("Handler should NOT be performed because 0 => 2 is skipping 1.")
@@ -194,7 +192,7 @@ class StateMachineChainTests: _TestCase
         var invokeCount = 0
 
         // add 0 => 1 => 2
-        let (routeID, handlerID) = machine.addRouteChain(.State0 => .State1 => .State2) { context in
+        let (routeID, _) = machine.addRouteChain(.State0 => .State1 => .State2) { context in
             invokeCount++
             return
         }
@@ -216,7 +214,7 @@ class StateMachineChainTests: _TestCase
         var invokeCount = 0
 
         // add 0 => 1 => 2
-        let (routeID, handlerID) = machine.addRouteChain(.State0 => .State1 => .State2) { context in
+        let (_, handlerID) = machine.addRouteChain(.State0 => .State1 => .State2) { context in
             invokeCount++
             return
         }

SwiftStateTests/StateMachineTests.swift

@@ -389,14 +389,14 @@ class StateMachineTests: _TestCase
         // add 0 => 1
         machine.addRoute(.State0 => .State1)
 
-        let handlerID = machine.addHandler(.State0 => .State1) { context in
+        machine.addHandler(.State0 => .State1) { context in
             returnedTransition = context.transition
         }
 
         // add 0 => 1 once more
         machine.addRoute(.State0 => .State1)
 
-        let handlerID2 = machine.addHandler(.State0 => .State1) { context in
+        machine.addHandler(.State0 => .State1) { context in
             returnedTransition2 = context.transition
         }
 
@@ -422,6 +422,12 @@ class StateMachineTests: _TestCase
         machine.addHandler(.State0 => .State1) { context in
             returnedTransition = context.transition
         }
+
+        XCTAssertTrue(returnedTransition == nil)
+
+        machine <- .State1
+
+        XCTAssertTrue(returnedTransition != nil)
     }
 
     //--------------------------------------------------
@@ -446,7 +452,7 @@ class StateMachineTests: _TestCase
         // add 0 => 1 once more
         machine.addRoute(.State0 => .State1)
 
-        let handlerID2 = machine.addHandler(.State0 => .State1) { context in
+        machine.addHandler(.State0 => .State1) { context in
             returnedTransition2 = context.transition
         }
 
@@ -495,7 +501,7 @@ class StateMachineTests: _TestCase
         // add 2 => 1 once more
         machine.addRoute(.State2 => .State1)
 
-        let handlerID2 = machine.addErrorHandler { context in
+        machine.addErrorHandler { context in
             returnedTransition2 = context.transition
         }
 

SwiftStateTests/StateTransitionChainTests.swift

@@ -61,7 +61,7 @@ class StateTransitionChainTests: _TestCase
     func testPrepend()
     {
         // 0 => 1
-        var transition = MyState.State0 => .State1
+        let transition = MyState.State0 => .State1
         var chain = transition.toTransitionChain()
 
         XCTAssertEqual(chain.numberOfTransitions, 1)