Add CI test for Elm in travis (#40)

* test elm in travis

* install elm

.gitignore

@@ -206,5 +206,8 @@ samples/client/petstore/dart/petstore/packages
 samples/client/petstore/dart/flutter_petstore/test/packages
 samples/client/petstore/dart/petstore/test/packages
 
-## JS
+# JS
 samples/client/petstore/javascript/package-lock.json
+
+# elm
+samples/client/petstore/elm/index.html

.travis.yml

@@ -41,6 +41,7 @@ before_install:
   - gem install bundler
   - npm install -g typescript
   - npm install -g npm
+  - npm install -g elm
   - npm config set registry http://registry.npmjs.org/
   # set python 3.6.3 as default
   - source ~/virtualenv/python3.6/bin/activate

pom.xml

@@ -848,8 +848,8 @@
             </activation>
             <modules>
                 <!-- clients -->
-                <!-- elm client not fully ready for CI yet
+                <!-- elm client not fully ready for CI yet -->
-                <module>samples/client/petstore/elm</module>-->
+                <module>samples/client/petstore/elm</module>
                 <module>samples/client/petstore/groovy</module>
                 <module>samples/client/petstore/rust</module>
                 <!--<module>samples/client/petstore/perl</module>-->

samples/client/petstore/elm/pom.xml

@@ -33,7 +33,12 @@
                             <goal>exec</goal>
                         </goals>
                         <configuration>
-                            <executable>./elm-compile-test</executable>
+                            <executable>elm</executable>
+                            <arguments>
+                                <argument>make</argument>
+                                <argument>--yes</argument>
+                                <argument>src/Main.elm</argument>
+                            </arguments>
                         </configuration>
                     </execution>
                 </executions>