Add code coverage.

Author: hsluoyz

.travis.yml

@@ -4,4 +4,7 @@ sudo: false
 
 jdk:
   - oraclejdk8
-  - openjdk8
+  - openjdk8
+
+after_success:
+  - mvn clean test jacoco:report coveralls:report

README.md

@@ -2,6 +2,7 @@ jCasbin
 ====
 
 [![Build Status](https://travis-ci.org/casbin/jcasbin.svg?branch=master)](https://travis-ci.org/casbin/jcasbin)
+[![Coverage Status](https://coveralls.io/repos/github/casbin/jcasbin/badge.svg?branch=master)](https://coveralls.io/github/casbin/jcasbin?branch=master)
 [![Release](https://img.shields.io/github/release/casbin/jcasbin.svg)](https://github.com/casbin/jcasbin/releases/latest)
 [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/casbin/lobby)
 [![Patreon](https://img.shields.io/badge/patreon-donate-yellow.svg)](http://www.patreon.com/yangluo)

pom.xml

@@ -7,6 +7,11 @@
     <groupId>org.casbin</groupId>
     <artifactId>jcasbin</artifactId>
     <version>0.0.1-SNAPSHOT</version>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
     <build>
         <plugins>
             <plugin>
@@ -17,6 +22,24 @@
                     <target>1.8</target>
                 </configuration>
             </plugin>
+            <plugin>
+                <groupId>org.eluder.coveralls</groupId>
+                <artifactId>coveralls-maven-plugin</artifactId>
+                <version>4.3.0</version>
+            </plugin>
+            <plugin>
+                <groupId>org.jacoco</groupId>
+                <artifactId>jacoco-maven-plugin</artifactId>
+                <version>0.7.6.201602180812</version>
+                <executions>
+                    <execution>
+                        <id>prepare-agent</id>
+                        <goals>
+                            <goal>prepare-agent</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>