Add testmod mixin for loading non-existent class with failing annotation

testmod/src/main/java/com/moulberry/mixinconstraints/testmod/mixin/TestMixinIntoNonExistentClass.java

@@ -0,0 +1,19 @@
+package com.moulberry.mixinconstraints.testmod.mixin;
+
+import com.moulberry.mixinconstraints.annotations.IfModLoaded;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Pseudo;
+
+@IfModLoaded("doesntexist")
+@Mixin(targets = "com.doesnt.exist.Main")
+@Pseudo
+public class TestMixinIntoNonExistentClass {
+
+    /*
+     * Without the annotation there would be an error message in the logs like:
+     * Error loading class: com/doesnt/exist/Main (java.lang.ClassNotFoundException: com/doesnt/exist/Main)
+     *
+     * This is undesirable, so the @IfModLoaded annotation should prevent the loading early enough for this message to not appear
+     */
+
+}

testmod/src/main/resources/testmod.mixins.json

@@ -5,6 +5,7 @@
   "plugin": "com.moulberry.mixinconstraints.ConstraintsMixinPlugin",
   "compatibilityLevel": "JAVA_8",
   "mixins": [
+    "TestMixinIntoNonExistentClass"
   ],
   "client": [
     "ExampleMixin",