Add Mixin audit unit test for Fabric

Doing this for NeoForge may need to wait until we build using ModDevGradle

build.gradle

@@ -57,6 +57,10 @@ allprojects {
         }
     }
 
+    tasks.test {
+        useJUnitPlatform()
+    }
+
     repositories {
         mavenLocal {
             mavenContent {

fabric/build.gradle

@@ -1,3 +1,6 @@
+import java.util.stream.Collectors
+import net.fabricmc.loom.util.gradle.SourceSetHelper
+
 plugins {
     id("quiet-fabric-loom")
     id 'maven-publish'
@@ -7,6 +10,7 @@ dependencies {
     minecraft "com.mojang:minecraft:${project.minecraft_version}"
     mappings loom.officialMojangMappings()
     modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
+    testImplementation "net.fabricmc:fabric-loader-junit:${project.loader_version}"
 
     runtimeOnly(project(":").sourceSets.main.output)
     shadow(project(":"))
@@ -48,6 +52,14 @@ tasks.shadowJar {
     relocate 'org.yaml.snakeyaml', 'ca.spottedleaf.moonrise.libs.org.yaml.snakeyaml'
 }
 
+tasks.test {
+    def classPathGroups = SourceSetHelper.getClasspath(loom.mods.main, getProject()).stream()
+        .map(File.&getAbsolutePath)
+        .collect(Collectors.joining(File.pathSeparator))
+
+    systemProperty("fabric.classPathGroups", classPathGroups)
+}
+
 publishMods {
     file = remapJar.archiveFile
     modLoaders = ["fabric"]

fabric/src/test/java/ca/spottedleaf/moonrise/fabric/MixinAuditTest.java

@@ -0,0 +1,20 @@
+package ca.spottedleaf.moonrise.fabric;
+
+import net.minecraft.SharedConstants;
+import net.minecraft.server.Bootstrap;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.spongepowered.asm.mixin.MixinEnvironment;
+
+public class MixinAuditTest {
+    @BeforeAll
+    static void beforeAll() {
+        SharedConstants.tryDetectVersion();
+        Bootstrap.bootStrap();
+    }
+
+    @Test
+    void auditMixins() {
+        MixinEnvironment.getCurrentEnvironment().audit();
+    }
+}