add pitest example

build.gradle

@@ -14,13 +14,15 @@ buildscript {
     dependencies {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "org.jetbrains.dokka:dokka-gradle-plugin:$dokka_version"
+        classpath 'info.solidsoft.gradle.pitest:gradle-pitest-plugin:1.1.10'
     }
 }
 
 apply plugin: 'java'
 apply plugin: 'kotlin'
 apply plugin: 'maven'
 apply plugin: 'org.jetbrains.dokka'
+apply plugin: "info.solidsoft.pitest"
 
 sourceCompatibility = 1.6
 
@@ -45,6 +47,13 @@ task javadocJar(type: Jar, dependsOn: dokkaJavadoc) {
     from javadoc.destinationDir
 }
 
+pitest {
+    targetClasses = ['com.github.sanity.pav.*']  //by default "${project.group}.*"
+    threads = 8
+    outputFormats = ['HTML']
+    jvmArgs = ['-Xmx1024m']
+}
+
 artifacts {
     archives javadocJar
 }

src/test/kotlin/com/github/sanity/pav/PAVSpec.kt

@@ -17,6 +17,7 @@ class PAVSpec : FreeSpec() {
                 val mergedY = (2.0 * 3.0 + 5.0 * 6.0) / (3.0 + 6.0)
                 val mergedWeight = 3.0 + 6.0
                 a.merge(b) shouldEqual Point(mergedX, mergedY, mergedWeight)
+
             }
         }