Added test coverage plugin and badges in readme

.gitlab-ci.yml

@@ -28,6 +28,7 @@ masterJobLinux:
   image: maven:3-jdk-8
   script: 
   - mvn -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn -B  clean deploy --settings settings.xml
+  - cat target/site/jacoco/index.html
   - mvn package sonar:sonar -s settings.xml
   only:
   - master
@@ -44,5 +45,6 @@ BranchJobLinux:
   image: maven:3-jdk-8
   script: 
   - mvn -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn -B  clean install --settings settings.xml
+  - cat target/site/jacoco/index.html
   except:
   - master

README.md

+![pipeline](https://git.rwth-aachen.de/monticore/EmbeddedMontiArc/languages/CNNArchLang/badges/master/build.svg)
+![coverage](https://git.rwth-aachen.de/monticore/EmbeddedMontiArc/languages/CNNArchLang/badges/master/coverage.svg)
+
 # CNNArch
 ## Introduction
 CNNArch is a descriptive language to model architectures of feedforward neural networks with a special focus on convolutional neural networks. 

pom.xml

@@ -58,6 +58,7 @@
         <compiler.plugin>3.3</compiler.plugin>
         <source.plugin>2.4</source.plugin>
         <shade.plugin>2.4.3</shade.plugin>
+        <jacoco.plugin>0.8.1</jacoco.plugin>
 
         <!-- Classifiers -->
         <grammars.classifier>grammars</grammars.classifier>
@@ -223,6 +224,29 @@
                 <version>2.8.1</version>
             </plugin>
 
+            <!-- Test coverage -->
+            <plugin>
+                <groupId>org.jacoco</groupId>
+                <artifactId>jacoco-maven-plugin</artifactId>
+                <version>${jacoco.plugin}</version>
+                <executions>
+                    <execution>
+                        <id>pre-unit-test</id>
+                        <goals>
+                            <goal>prepare-agent</goal>
+                        </goals>
+                    </execution>
+                    <execution>
+                        <id>post-unit-test</id>
+                        <phase>test</phase>
+                        <goals>
+                            <goal>report</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+
+
             <!-- MontiCore Generation -->
             <plugin>
                 <groupId>de.monticore.mojo</groupId>

src/main/grammars/de/monticore/lang/monticar/CNNArch.mc4

@@ -127,7 +127,6 @@ grammar CNNArch extends de.monticore.CommonExpressions, de.monticore.lang.Math,
                                              | MathDottedNameExpression
                                              | MathAssignmentDeclarationStatement
                                              | MathAssignmentStatement);
-                                             //| MinusPrefixExpression);
 
     ArchComplexArithmeticExpression implements ArchArithmeticExpression = leftExpression:ArchMathExpression
                                                NEWLINETOKEN*