totalngrams: start adding unit tests
diff --git a/pom.xml b/pom.xml
index 06d16eb..54b31bf 100644
--- a/pom.xml
+++ b/pom.xml
@@ -156,5 +156,11 @@
             <artifactId>parallelgzip</artifactId>
             <version>1.0.5</version>
         </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>RELEASE</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>
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