min java version 8, version changed to 3.1.0, missing test libs

Author: Valentin Popov

pom.xml

@@ -37,5 +37,17 @@
             <artifactId>microsoft-graph-core</artifactId>
             <version>2.0.0</version>
         </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>5.5.2</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>3.8.0</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>