Exclude test mixin packages due to error in JUnit test discovery

build.gradle

@@ -67,7 +67,6 @@ tasks.register("genAll") {
     dependsOn(generatePackageInfo, generateMixinConfigs)
 }
 
-// TODO mixin auto-gen for mixins in the test sourceset
 mixinGen {
     filePattern = "cubicchunks.mixins.%s.json"
     defaultRefmap = "CubicChunks-refmap.json"

buildSrc/src/main/java/io/github/opencubicchunks/gradle/GeneratePackageInfo.java

@@ -44,6 +44,10 @@ private static Map<Path, Path> getPackages(SourceDirectorySet allJava) throws IO
         Map<Path, Path> packages = new HashMap<>();
         for (File it : allJava) {
             Path javaClass = it.getCanonicalFile().toPath();
+            if (javaClass.toString().contains("mixin/test")) {
+                // junit will try to load package-info files (when scanning for tests) causing mixin to throw as classes in mixin packages must not be loaded.
+                continue;
+            }
             for (Path srcPath : srcPaths) {
                 if (javaClass.startsWith(srcPath) && javaClass.toString().endsWith(".java")) {
                     Path relative = srcPath.relativize(javaClass);