Some test harness stuffs. Time to get the registry manager properly tested.

src/main/java/net/minecraftforge/fml/common/Loader.java

@@ -204,7 +204,7 @@ public class Loader
         }
 
         modClassLoader = new ModClassLoader(getClass().getClassLoader());
-        if (!mccversion.equals(MC_VERSION))
+        if (mccversion !=null && !mccversion.equals(MC_VERSION))
         {
             FMLLog.severe("This version of FML is built for Minecraft %s, we have detected Minecraft %s in your minecraft jar file", mccversion, MC_VERSION);
             throw new LoaderException(String.format("This version of FML is built for Minecraft %s, we have detected Minecraft %s in your minecraft jar file", mccversion, MC_VERSION));
@@ -1023,7 +1023,10 @@ public class Loader
 
     public void fireRemapEvent(Map<ResourceLocation, Integer[]> remapBlocks, Map<ResourceLocation, Integer[]> remapItems, boolean isFreezing)
     {
-        modController.propogateStateMessage(new FMLModIdMappingEvent(remapBlocks, remapItems, isFreezing));
+        if (modController!=null)
+        {
+            modController.propogateStateMessage(new FMLModIdMappingEvent(remapBlocks, remapItems, isFreezing));
+        }
     }
 
     public void runtimeDisableMod(String modId)

src/main/java/net/minecraftforge/fml/common/ModClassLoader.java

@@ -55,7 +55,10 @@ public class ModClassLoader extends URLClassLoader
 
     public ModClassLoader(ClassLoader parent) {
         super(new URL[0], null);
-        this.mainClassLoader = (LaunchClassLoader)parent;
+        if (parent instanceof LaunchClassLoader)
+        {
+            this.mainClassLoader = (LaunchClassLoader)parent;
+        }
         this.sources = Lists.newArrayList();
     }
 

src/main/java/net/minecraftforge/fml/common/registry/PersistentRegistryManager.java

@@ -61,7 +61,7 @@ import com.google.common.collect.Sets.SetView;
 @SuppressWarnings("WeakerAccess")
 public class PersistentRegistryManager
 {
-    private enum PersistentRegistry
+    enum PersistentRegistry
     {
         ACTIVE, VANILLA, FROZEN, STAGING;
 

src/main/java/net/minecraftforge/fml/relauncher/FMLRelaunchLog.java

@@ -54,6 +54,8 @@ public class FMLRelaunchLog {
     private static void configureLogging()
     {
         log.myLog = LogManager.getLogger("FML");
+        // Default side to client for test harness purposes
+        if (side == null) side = Side.CLIENT;
         ThreadContext.put("side", side.name().toLowerCase(Locale.ENGLISH));
         configured = true;