two-fer: implementation of two-fer exercise in Kotlin

config.json

@@ -15,6 +15,16 @@
 
       ]
     },
+    {
+      "uuid": "fa4194c5-084d-f780-4db6-707ef7bcc30c00e9ee5",
+      "slug": "two-fer",
+      "core": false,
+      "unlocked_by": null,
+      "difficulty": 2,
+      "topics": [
+
+      ]
+    },
     {
       "uuid": "9772c916-c619-445c-834d-af7dbf1ad2d9",
       "slug": "rna-transcription",
@@ -633,3 +643,4 @@
   ],
   "solution_pattern": "reference"
 }
+

exercises/settings.gradle

@@ -61,4 +61,5 @@ include 'strain'
 include 'sublist'
 include 'sum-of-multiples'
 include 'triangle'
+include 'two-fer'
 include 'word-count'

exercises/two-fer/.meta/src/reference/kotlin/Twofer.kt

@@ -0,0 +1,3 @@
+fun twofer(name: String = "you"): String {
+    return "One for $name, one for me."
+}

exercises/two-fer/README.md

@@ -0,0 +1,18 @@
+`Two-fer` or `2-fer` is short for two for one. One for you and one for me.
+
+```text
+"One for X, one for me."
+```
+
+When X is a name or "you".
+
+If the given name is "Alice", the result should be "One for Alice, one for me."
+If no name is given, the result should be "One for you, one for me."
+
+## Instructions
+
+Submissions are encouraged to be general, within reason. Having said that, it's
+also important not to over-engineer a solution.
+
+It's important to remember that the goal is to make code as expressive and
+readable as we can.

exercises/two-fer/build.gradle

@@ -0,0 +1,28 @@
+buildscript {
+  ext.kotlin_version = '1.1.4-3'
+  repositories {
+    mavenCentral()
+  }
+  dependencies {
+    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+  }
+}
+
+apply plugin: 'kotlin'
+
+repositories {
+  mavenCentral()
+}
+
+dependencies {
+  compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+
+  testCompile 'junit:junit:4.12'
+  testCompile "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"
+}
+test {
+  testLogging {
+    exceptionFormat = 'full'
+    events = ["passed", "failed", "skipped"]
+  }
+}

exercises/two-fer/src/test/kotlin/TwoferTest.kt

@@ -0,0 +1,31 @@
+import org.junit.Ignore
+import org.junit.Test
+import kotlin.test.assertEquals
+
+
+class TwoferTest {
+
+    @Test
+    fun noNameGiven() {
+        assertEquals("One for you, one for me.", twofer())
+    }
+
+    @Test
+    @Ignore
+    fun aNameGiven() {
+        assertEquals("One for Alice, one for me.", twofer("Alice"))
+    }
+
+    @Test
+    @Ignore
+    fun anotherNameGiven() {
+        assertEquals("One for Bob, one for me.", twofer("Bob"))
+    }
+
+    @Test
+    @Ignore
+    fun emptyStringGiven() {
+        assertEquals("One for , one for me.", twofer(""))
+    }
+
+}