MacOSX: fixed some failing tests

Author: Federico Fissore

app/build.xml

@@ -106,6 +106,7 @@
     <junit printsummary="yes" dir="${work.dir}" fork="true">
       <jvmarg value="-Djava.library.path=${java.additional.library.path}"/>
       <jvmarg value="-DWORK_DIR=."/>
+      <jvmarg value="-ea"/>
       <classpath>
         <pathelement location="bin"/>
         <pathelement location="test-bin"/>

app/test/processing/app/AbstractWithPreferencesTest.java

@@ -38,6 +38,7 @@ public abstract class AbstractWithPreferencesTest {
   public void init() throws Exception {
     Runtime.getRuntime().addShutdownHook(new Thread(DeleteFilesOnShutdown.INSTANCE));
     Base.initPlatform();
+    Base.getPlatform().init();
     Preferences.init(null);
     Theme.init();
 

arduino-core/src/cc/arduino/contributions/packages/HostDependentDownloadableContribution.java

@@ -41,7 +41,9 @@ public String toString() {
 
   public boolean isCompatible(Platform platform) {
     String osName = platform.getOsName();
+    assert osName != null;
     String osArch = platform.getOsArch();
+    assert osArch != null;
 
     String host = getHost();