first hello world test

src/main/java/com/github/lothar/hsystem/InstructionProcessor.java

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+package com.github.lothar.hsystem;
+
+import org.springframework.stereotype.Component;
+
+@Component
+public class InstructionProcessor {
+
+  public void process(String instruction) {
+    System.out.println("Hello world !");
+  }
+
+}

src/test/features/simple-instruction.feature

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+Feature: Execute a simple instruction locally 
+
+	@done 
+	Scenario: Prints something in the console when user asks so 
+		When I say "Print \"Hello world !\" in the console" 
+		Then "Hello world !" is printed in the console

src/test/java/com/github/lothar/hsystem/cucumber/CucumberTests.java

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+package com.github.lothar.hsystem.cucumber;
+
+import org.junit.runner.RunWith;
+
+import cucumber.api.CucumberOptions;
+import cucumber.api.junit.Cucumber;
+
+@RunWith(Cucumber.class)
+@CucumberOptions(plugin = "pretty",
+    monochrome = true,
+	features = "src/test/features",
+	glue = { "com.github.lothar.hsystem.cucumber", "cucumber.api.spring" },
+	tags = { "~@ignore", "@done" })
+public class CucumberTests {
+
+}

src/test/java/com/github/lothar/hsystem/cucumber/SimplePrintStepDefs.java

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+package com.github.lothar.hsystem.cucumber;
+
+import static org.mockito.Mockito.verify;
+
+import java.io.PrintStream;
+
+import javax.annotation.Resource;
+
+import org.mockito.Mockito;
+import org.springframework.boot.test.SpringApplicationContextLoader;
+import org.springframework.test.context.ContextConfiguration;
+
+import com.github.lothar.hsystem.HSystemApplication;
+import com.github.lothar.hsystem.InstructionProcessor;
+
+import cucumber.api.java.Before;
+import cucumber.api.java.en.Then;
+import cucumber.api.java.en.When;
+
+@ContextConfiguration(classes = HSystemApplication.class, loader = SpringApplicationContextLoader.class)
+public class SimplePrintStepDefs {
+
+  @Resource
+  private InstructionProcessor processor;
+  private PrintStream sysoutMock = Mockito.mock(PrintStream.class);
+
+  @Before
+  public void before() {
+    System.setOut(sysoutMock);
+  }
+
+  public void after() {
+    System.setOut(System.out);
+  }
+
+  @When("^I say \"Print (.*) in the console\"$")
+  public void i_say_print_in_the_console(String instruction) {
+    processor.process("Print " + instruction + " in the console");
+  }
+
+  @Then("^\"([^\"]*)\" is printed in the console$")
+  public void is_printed_in_the_console(String expectedOutput) {
+    verify(sysoutMock).println(expectedOutput);
+  }
+}