Added test case for state machines

The test case is currently failing. See FIXME statement in function
StateMachineFlatten.addStateActivationAndReset(..).

simulation/modelica/statemachines/AccessFromOutside.mo

@@ -0,0 +1,25 @@
+model AccessFromOutside "Access previous value from local state variable from outside"
+  output Real y;
+  model State1
+  output Integer i(start=2);
+  equation
+    i = previous(i) + 2;
+  end State1;
+  State1 state1;
+  model State2
+  end State2;
+  State2 state2;
+equation
+  initialState(state1);
+  transition(
+    state1,
+    state2,
+    state1.i > 10,
+    immediate=false);
+  transition(
+    state2,
+    state1,
+    true,
+    immediate=false);
+  y = previous(state1.i);
+end AccessFromOutside;

simulation/modelica/statemachines/AccessFromOutside.mos

@@ -0,0 +1,27 @@
+// name:     AccessFromOutside
+// keywords: state machines
+// status: correct
+//
+
+loadFile("AccessFromOutside.mo");
+echo(false);
+setCommandLineOptions({"+simCodeTarget=Cpp"}); getErrorString();
+simulate(AccessFromOutside, startTime=0, stopTime=10, numberOfIntervals = 0); getErrorString();
+echo(true);
+val(state1.i,4.0);
+val(y,4.0);
+val(state1.i,5.0);
+val(y,5.0);
+val(state1.i,6.0);
+val(y,6.0);
+
+// Result:
+// true
+// true
+// 12.0
+// 10.0
+// 12.0
+// 12.0
+// 4.0
+// 2.0
+// endResult

simulation/modelica/statemachines/Makefile

@@ -15,7 +15,7 @@ EnteringByReset.mos \
 # Run make failingtest
 FAILINGTESTFILES = \
 SingleState.mos \
-
+AccessFromOutside.mos \
 
 # Dependency files that are not .mo .mos or Makefile
 # Add them here or they will be cleaned.