Add failsafe plugin and basic test, to verify the binary

distribution zip file has been created.

pmd-dist/pom.xml

@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>pmd-dist</artifactId>
     <name>PMD Distribution Packages</name>
-    <packaging>pom</packaging>
+    <packaging>jar</packaging>
 
     <parent>
         <groupId>net.sourceforge.pmd</groupId>
@@ -55,6 +55,19 @@
                     </execution>
                 </executions>
             </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-failsafe-plugin</artifactId>
+                <version>2.19.1</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>integration-test</goal>
+                            <goal>verify</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
     <dependencies>
@@ -143,6 +156,13 @@
             <artifactId>pmd-xml</artifactId>
             <version>${project.version}</version>
         </dependency>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.11</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <profiles>

pmd-dist/src/test/java/net/sourceforge/pmd/it/BinaryDistTest.java

@@ -0,0 +1,22 @@
+/**
+ * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
+ */
+
+package net.sourceforge.pmd.it;
+
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+
+import org.junit.Test;
+
+import net.sourceforge.pmd.PMD;
+
+public class BinaryDistTest {
+
+    @Test
+    public void testFileExistence() {
+        File file = new File(".", "target/pmd-bin-" + PMD.VERSION + ".zip");
+        assertTrue(file.exists());
+    }
+}