fix elm test spec (#6572)

bin/openapi3/elm.sh

@@ -27,6 +27,6 @@ fi
 
 # if you've executed sbt assembly previously it will use that instead.
 export JAVA_OPTS="${JAVA_OPTS} -Xmx1024M -DloggerPath=conf/log4j.properties"
-ags="generate -i modules/openapi-generator/src/test/resources/3_0/elm.yaml -g elm -t modules/openapi-generator/src/main/resources/elm -o samples/openapi3/client/elm --skip-validate-spec $@"
+ags="generate -i modules/openapi-generator/src/test/resources/3_0/elm.yaml -g elm -t modules/openapi-generator/src/main/resources/elm -o samples/openapi3/client/elm $@"
 
 java $JAVA_OPTS -jar $executable $ags

modules/openapi-generator/src/test/resources/3_0/elm.yaml

@@ -64,14 +64,17 @@ paths:
       parameters:
         - name: string
           in: path
+          required: true 
           schema:
             type: string
         - name: integer
           in: path
+          required: true 
           schema:
             type: integer
         - name: enumeration
           in: path
+          required: true 
           schema:
             type: string
             enum: [a, b, c]