added reverse string exercise to track

config.json

@@ -13,6 +13,16 @@
       "uuid": "f77dc7e3-35a8-4300-a7c8-2c1765e9644d"
     },
     {
+      "core": false,
+      "difficulty": 1,
+      "slug": "reverse-string",
+      "topics": [
+        "strings"
+      ],
+      "unlocked_by": null,
+      "uuid": "2c8afeed-480e-41f3-ad58-590fa8f88029"
+    },
+    {
       "core": true,
       "difficulty": 1,
       "slug": "two-fer",

exercises/reverse-string/.meta/src/reference/java/ReverseString.java

@@ -0,0 +1,7 @@
+class ReverseString {
+  
+    String reverse(String inputString) {
+        return new StringBuffer(inputString).reverse().toString();
+    }
+  
+}

exercises/reverse-string/.meta/version

@@ -0,0 +1 @@
+1.0.1

exercises/reverse-string/README.md

@@ -0,0 +1,17 @@
+# Reverse String
+
+For example: input: "cool" output: "looc"
+
+# Running the tests
+
+You can run all the tests for an exercise by entering
+
+```sh
+$ gradle test
+```
+
+in your terminal.
+
+## Submitting Incomplete Solutions
+
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.

exercises/reverse-string/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/reverse-string/src/main/java/ReverseString.java

@@ -0,0 +1,7 @@
+class ReverseString {
+  
+    String reverse() {
+        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
+    }
+  
+}

exercises/reverse-string/src/test/java/ReverseStringTest.java

@@ -0,0 +1,37 @@
+import org.junit.Ignore;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class ReverseStringTest {
+
+    @Test
+    public void testAnEmptyString() {
+        assertEquals("", new ReverseString().reverse(""));
+    }
+
+    @Ignore("Remove to run test")
+    @Test
+    public void testAWord() {
+        assertEquals("tobor", new ReverseString().reverse("robot"));
+    }
+
+    @Ignore("Remove to run test")
+    @Test
+    public void testACapitalizedWord() {
+        assertEquals("nemaR", new ReverseString().reverse("Ramen"));
+    }
+
+    @Ignore("Remove to run test")
+    @Test
+    public void testASentenceWithPunctuation() {
+        assertEquals("!yrgnuh m'I", new ReverseString().reverse("I'm hungry!"));
+    }
+
+    @Ignore("Remove to run test")
+    @Test
+    public void testAPalindrome() {
+        assertEquals("racecar", new ReverseString().reverse("racecar"));
+    }
+
+}

exercises/settings.gradle

@@ -59,6 +59,7 @@ include 'pythagorean-triplet'
 include 'queen-attack'
 include 'raindrops'
 include 'rectangles'
+include 'reverse-string'
 include 'rna-transcription'
 include 'robot-name'
 include 'robot-simulator'