Add examples

Author: mpkorstanje

.gitignore

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+.idea
+**/*.iml
+**/target/

examples/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>io.cucumber</groupId>
+        <artifactId>cucumber-jvm-scala</artifactId>
+        <version>2.0.2-SNAPSHOT</version>
+    </parent>
+
+    <artifactId>scala-examples</artifactId>
+    <packaging>jar</packaging>
+    <name>Examples: Scala Calculator</name>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.cucumber</groupId>
+            <artifactId>cucumber-scala_2.12</artifactId>
+            <version>${project.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.cucumber</groupId>
+            <artifactId>cucumber-junit</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.scala-lang</groupId>
+            <artifactId>scala-library</artifactId>
+            <version>${scala.2.12.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.scala-lang</groupId>
+            <artifactId>scala-compiler</artifactId>
+            <version>${scala.2.12.version}</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <artifactId>maven-deploy-plugin</artifactId>
+                <configuration>
+                    <skip>true</skip>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>net.alchim31.maven</groupId>
+                <artifactId>scala-maven-plugin</artifactId>
+                <configuration>
+                    <!--encoding>UTF-8</encoding-->
+                    <excludes>
+                        <exclude>**/*.java</exclude>
+                    </excludes>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>add-source</goal>
+                            <goal>compile</goal>
+                            <goal>testCompile</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

examples/src/main/scala/cucumber/examples/scalacalculator/RpnCalculator.scala

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+package cucumber.examples.scalacalculator
+
+import scala.collection.mutable.Queue
+
+
+sealed trait Arg
+
+object Arg{
+  implicit def op(s:String) = Op(s)
+  implicit def value(v:Double) = Val(v)
+}
+
+case class Op(value: String) extends Arg
+case class Val(value: Double) extends Arg
+
+class RpnCalculator {
+  private val stack = new Queue[Double]
+
+  private def op(f: (Double, Double) => Double) =
+    stack += f(stack.dequeue(), stack.dequeue())
+
+  def push(arg: Arg) {
+    arg match {
+      case Op("+") => op(_ + _)
+      case Op("-") => op(_ - _)
+      case Op("*") => op(_ * _)
+      case Op("/") => op(_ / _)
+      case Val(value) => stack += value
+    }
+  }
+
+  def value = stack.head
+}

examples/src/test/resources/cucumber/examples/scalacalculator/basic_arithmetic.feature

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+@foo
+Feature: Basic Arithmetic
+
+  Scenario: Adding
+  # Try to change one of the values below to provoke a failure
+    When I add 4 and 5
+    Then the result is 9

examples/src/test/scala/cucumber/examples/scalacalculator/RpnCalculatorStepDefinitions.scala

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+package cucumber.examples.scalacalculator
+
+import cucumber.api.Scenario
+import cucumber.api.scala.{ScalaDsl, EN}
+import org.junit.Assert._
+
+class RpnCalculatorStepDefinitions extends ScalaDsl with EN {
+
+  val calc = new RpnCalculator
+
+  When("""^I add (\d+) and (\d+)$"""){ (arg1: Double, arg2: Double) =>
+    calc push arg1
+    calc push arg2
+    calc push "+"
+  }
+
+  Then("^the result is (\\d+)$") { expected: Double =>
+    assertEquals(expected, calc.value, 0.001)
+  }
+
+  Before("not @foo"){ scenario : Scenario =>
+    println("Runs before scenarios *not* tagged with @foo")
+  }
+}

examples/src/test/scala/cucumber/examples/scalacalculator/RunCukesTest.scala

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+package cucumber.examples.scalacalculator
+
+import org.junit.runner.RunWith
+import cucumber.api.junit.Cucumber
+
+@RunWith(classOf[Cucumber])
+class RunCukesTest