Add hello world examples

hystrix/src/test/java/com/baeldung/hystrix/HystrixTimeoutTest.java

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+package com.baeldung.hystrix;
+
+import com.netflix.hystrix.*;
+import com.netflix.hystrix.exception.HystrixRuntimeException;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.equalTo;
+
+public class HystrixTimeoutTest {
+
+    private static HystrixCommand.Setter config;
+    private static HystrixCommandProperties.Setter commandProperties = HystrixCommandProperties.Setter();
+
+
+    @Rule
+    public final ExpectedException exception = ExpectedException.none();
+
+    @Before
+    public void setup() {
+        config = HystrixCommand
+                .Setter
+                .withGroupKey(HystrixCommandGroupKey.Factory.asKey("RemoteServiceGroup1"));
+    }
+
+    @Test
+    public void givenTimeoutEqualTo100_andDefaultSettings_thenReturnSuccess() throws InterruptedException {
+        assertThat(new RemoteServiceTestCommand(config, new RemoteServiceTestSimulator(100)).execute(), equalTo("Success"));
+    }
+
+    @Test
+    public void givenTimeoutEqualTo10000_andDefaultSettings_thenExpectHystrixRuntimeException() throws InterruptedException {
+        exception.expect(HystrixRuntimeException.class);
+        new RemoteServiceTestCommand(config, new RemoteServiceTestSimulator(10_000)).execute();
+
+    }
+
+    @Test
+    public void givenTimeoutEqualTo5000_andExecutionTimeoutEqualTo10000_thenReturnSuccess() throws InterruptedException {
+        commandProperties.withExecutionTimeoutInMilliseconds(10_000);
+        config.andCommandPropertiesDefaults(commandProperties);
+        assertThat(new RemoteServiceTestCommand(config, new RemoteServiceTestSimulator(5_000)).execute(), equalTo("Success"));
+    }
+
+    @Test
+    public void givenTimeoutEqualTo15000_andExecutionTimeoutEqualTo10000_thenExpectHystrixRuntimeException() throws InterruptedException {
+        exception.expect(HystrixRuntimeException.class);
+        commandProperties.withExecutionTimeoutInMilliseconds(10_000);
+        config.andCommandPropertiesDefaults(commandProperties);
+        new RemoteServiceTestCommand(config, new RemoteServiceTestSimulator(15_000)).execute();
+    }
+
+
+}

hystrix/src/test/java/com/baeldung/hystrix/RemoteServiceTestCommand.java

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+package com.baeldung.hystrix;
+
+import com.netflix.hystrix.HystrixCommand;
+import com.netflix.hystrix.HystrixCommandGroupKey;
+
+
+class RemoteServiceTestCommand extends HystrixCommand<String> {
+
+    private final RemoteServiceTestSimulator remoteService;
+
+    RemoteServiceTestCommand(Setter config, RemoteServiceTestSimulator remoteService) {
+        super(config);
+        this.remoteService = remoteService;
+    }
+
+    @Override
+    protected String run() throws Exception {
+        return remoteService.execute();
+    }
+}

hystrix/src/test/java/com/baeldung/hystrix/RemoteServiceTestSimulator.java

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+package com.baeldung.hystrix;
+
+
+class RemoteServiceTestSimulator {
+
+    private long wait;
+
+    RemoteServiceTestSimulator(long wait) throws InterruptedException {
+        this.wait = wait;
+    }
+
+    String execute() throws InterruptedException {
+        Thread.sleep(wait);
+        return "Success";
+    }
+}