implemented exercise two-fer

config.json

@@ -11,6 +11,11 @@
       "topics": []
     },
     {
+      "slug": "two-fer",
+      "difficulty": 1,
+      "topics": []
+    },
+    {
       "slug": "rna-transcription",
       "difficulty": 2,
       "topics": []

exercises/settings.gradle

@@ -67,5 +67,6 @@ include 'sum-of-multiples'
 include 'triangle'
 include 'trinary'
 include 'twelve-days'
+include 'two-fer'
 include 'word-count'
 include 'wordy'

exercises/two-fer/build.gradle

@@ -0,0 +1,17 @@
+apply plugin: "java"
+apply plugin: "eclipse"
+apply plugin: "idea"
+
+repositories {
+  mavenCentral()
+}
+
+dependencies {
+  testCompile "junit:junit:4.12"
+}
+test {
+  testLogging {
+    exceptionFormat = 'full'
+    events = ["passed", "failed", "skipped"]
+  }
+}

exercises/two-fer/src/example/java/Twofer.java

@@ -0,0 +1,5 @@
+public class Twofer {
+    public String twofer(String name) {
+        return "One for " + (name != null ? name : "you") + ", one for me.";
+    }
+}

exercises/two-fer/src/main/java/Twofer.java

@@ -0,0 +1,5 @@
+public class Twofer {
+    public String twofer(String name) {
+        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
+    }
+}

exercises/two-fer/src/test/java/TwoferTest.java

@@ -0,0 +1,41 @@
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class TwoferTest {
+
+    private Twofer twofer;
+
+    @Before
+    public void setup() {
+        twofer = new Twofer();
+    }
+
+    @Test
+    public void noNameGiven() {
+        String input = null;
+        String expected = "One for you, one for me.";
+
+        assertEquals(expected, twofer.twofer(input));
+    }
+
+    @Test
+    @Ignore("Remove to run test")
+    public void aNameGiven() {
+        String input = "Alice";
+        String expected = "One for Alice, one for me.";
+
+        assertEquals(expected, twofer.twofer(input));
+    }
+
+    @Test
+    @Ignore("Remove to run test")
+    public void anotherNameGiven() {
+        String input = "Bob";
+        String expected = "One for Bob, one for me.";
+
+        assertEquals(expected, twofer.twofer(input));
+    }
+}