Add tests for turnstile sample

spring-statemachine-samples/src/main/java/demo/AbstractStateMachineCommands.java

@@ -24,6 +24,7 @@ import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.shell.core.CommandMarker;
 import org.springframework.shell.core.annotation.CliCommand;
 import org.springframework.statemachine.StateMachine;
+import org.springframework.statemachine.state.State;
 import org.springframework.stereotype.Component;
 import org.springframework.util.StringUtils;
 
@@ -43,7 +44,12 @@ public class AbstractStateMachineCommands<S, E> implements CommandMarker {
 
 	@CliCommand(value = "sm state", help = "Prints current state")
 	public String state() {
-		return StringUtils.collectionToCommaDelimitedString(stateMachine.getState().getIds());
+		State<S, E> state = stateMachine.getState();
+		if (state != null) {
+			return StringUtils.collectionToCommaDelimitedString(state.getIds());
+		} else {
+			return "No state";
+		}
 	}
 
 	@CliCommand(value = "sm start", help = "Start a state machine")

spring-statemachine-samples/turnstile/src/test/java/demo/turnstile/TurnstileTests.java

@@ -0,0 +1,155 @@
+/*
+ * Copyright 2015 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package demo.turnstile;
+
+import static org.hamcrest.Matchers.contains;
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.assertThat;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.statemachine.EnumStateMachine;
+import org.springframework.statemachine.StateMachine;
+import org.springframework.statemachine.StateMachineSystemConstants;
+import org.springframework.statemachine.listener.StateMachineListener;
+import org.springframework.statemachine.listener.StateMachineListenerAdapter;
+import org.springframework.statemachine.state.State;
+import org.springframework.statemachine.transition.Transition;
+
+import demo.CommonConfiguration;
+import demo.turnstile.Application.Events;
+import demo.turnstile.Application.States;
+
+public class TurnstileTests {
+
+	private AnnotationConfigApplicationContext context;
+
+	private StateMachine<States, Events> machine;
+
+	private TestListener listener;
+
+	private StateMachineCommands commands;
+
+	@Test
+	public void testNotStarted() throws Exception {
+		assertThat(commands.state(), is("No state"));
+	}
+
+	@Test
+	public void testInitialState() throws Exception {
+		machine.start();
+		listener.stateChangedLatch.await(1, TimeUnit.SECONDS);
+		listener.stateEnteredLatch.await(1, TimeUnit.SECONDS);
+		assertThat(machine.getState().getIds(), contains(States.LOCKED));
+		assertThat(listener.statesEntered.size(), is(1));
+		assertThat(listener.statesEntered.get(0).getId(), is(States.LOCKED));
+		assertThat(listener.statesExited.size(), is(0));
+	}
+
+	static class Config {
+
+		@Autowired
+		private StateMachine<States,Events> machine;
+
+		@Bean
+		public StateMachineListener<States, Events> stateMachineListener() {
+			TestListener listener = new TestListener();
+			machine.addStateListener(listener);
+			return listener;
+		}
+	}
+
+	static class TestListener extends StateMachineListenerAdapter<States, Events> {
+
+		volatile CountDownLatch stateChangedLatch = new CountDownLatch(1);
+		volatile CountDownLatch stateEnteredLatch = new CountDownLatch(2);
+		volatile CountDownLatch stateExitedLatch = new CountDownLatch(0);
+		volatile CountDownLatch transitionLatch = new CountDownLatch(0);
+		volatile List<Transition<States, Events>> transitions = new ArrayList<Transition<States,Events>>();
+		List<State<States, Events>> statesEntered = new ArrayList<State<States,Events>>();
+		List<State<States, Events>> statesExited = new ArrayList<State<States,Events>>();
+		volatile int transitionCount = 0;
+
+		@Override
+		public void stateChanged(State<States, Events> from, State<States, Events> to) {
+			stateChangedLatch.countDown();
+		}
+
+		@Override
+		public void stateEntered(State<States, Events> state) {
+			statesEntered.add(state);
+			stateEnteredLatch.countDown();
+		}
+
+		@Override
+		public void stateExited(State<States, Events> state) {
+			statesExited.add(state);
+			stateExitedLatch.countDown();
+		}
+
+		@Override
+		public void transition(Transition<States, Events> transition) {
+			transitions.add(transition);
+			transitionLatch.countDown();
+			transitionCount++;
+		}
+
+		public void reset(int c1, int c2, int c3) {
+			reset(c1, c2, c3, 0);
+		}
+
+		public void reset(int c1, int c2, int c3, int c4) {
+			stateChangedLatch = new CountDownLatch(c1);
+			stateEnteredLatch = new CountDownLatch(c2);
+			stateExitedLatch = new CountDownLatch(c3);
+			transitionLatch = new CountDownLatch(c4);
+			statesEntered.clear();
+			statesExited.clear();
+			transitionCount = 0;
+			transitions.clear();
+		}
+
+	}
+
+	@SuppressWarnings("unchecked")
+	@Before
+	public void setup() {
+		context = new AnnotationConfigApplicationContext();
+		context.register(CommonConfiguration.class, Application.class, Config.class, StateMachineCommands.class);
+		context.refresh();
+		machine = context.getBean(StateMachineSystemConstants.DEFAULT_ID_STATEMACHINE, EnumStateMachine.class);
+		listener = context.getBean(TestListener.class);
+		commands = context.getBean(StateMachineCommands.class);
+	}
+
+	@After
+	public void clean() {
+		machine.stop();
+		context.close();
+		context = null;
+		machine = null;
+	}
+
+}