- fix: NullPointerException when the config class of mod updated

- alter: better test code in `common/src/test`, `neoforge/src/test` and `fabric/src/test`, run `Test Minecraft Client(:fabric)` or `Test Minecraft Client(:neoforge)` for testing

fabric/build.gradle

@@ -11,7 +11,27 @@ architectury {
     fabric()
 }
 
+sourceSets {
+    test {
+        compileClasspath += main.compileClasspath
+        runtimeClasspath += main.runtimeClasspath
+        java {
+            srcDirs.add('src/test/java' as File)
+        }
+        resources {
+            srcDirs.add('src/test/resources' as File)
+        }
+    }
+}
+
 loom {
+    runs {
+        testClient {
+            client()
+            configName = "Test Minecraft Client"
+            source sourceSets.test
+        }
+    }
 }
 
 configurations {
@@ -27,10 +47,12 @@ configurations {
 dependencies {
     modImplementation "net.fabricmc:fabric-loader:${rootProject.fabric_loader_version}"
     modApi "net.fabricmc.fabric-api:fabric-api:${rootProject.fabric_api_version}"
-    modCompileOnly ("com.terraformersmc:modmenu:${rootProject.mod_menu_version}")
+    modCompileOnly("com.terraformersmc:modmenu:${rootProject.mod_menu_version}")
 
     common(project(path: ":common", configuration: "namedElements")) { transitive false }
     shadowCommon(project(path: ":common", configuration: "transformProductionFabric")) { transitive false }
+
+    testImplementation common(project(path: ':common', configuration: 'testOutput'))
 }
 
 processResources {
@@ -41,6 +63,14 @@ processResources {
     }
 }
 
+processTestResources {
+    inputs.property "version", rootProject.version
+
+    filesMatching("fabric.mod.json") {
+        expand "version": rootProject.version
+    }
+}
+
 shadowJar {
     exclude "architectury.common.json"
 
@@ -71,7 +101,7 @@ unifiedPublishing {
         releaseType = "$project.release_type"
         changelog = releaseChangelog()
         gameVersions = []
-        gameLoaders = ["fabric","quilt"]
+        gameLoaders = ["fabric", "quilt"]
         mainPublication remapJar
         relations {
             depends {

fabric/src/test/java/eu/midnightdust/test/fabric/MLExampleFabric.java

@@ -0,0 +1,12 @@
+package eu.midnightdust.test.fabric;
+
+import eu.midnightdust.test.config.MidnightConfigExample;
+import eu.midnightdust.lib.config.MidnightConfig;
+import net.fabricmc.api.ModInitializer;
+
+public class MLExampleFabric implements ModInitializer {
+    @Override
+    public void onInitialize() {
+        MidnightConfig.init("modid", MidnightConfigExample.class);
+    }
+}

fabric/src/test/resources/fabric.mod.json

@@ -0,0 +1,23 @@
+{
+    "schemaVersion": 1,
+    "id": "modid",
+    "version": "${version}",
+
+    "name": "MidnightLib Test Mod",
+    "description": "Example Mod for Team MidnightDust's mods.",
+    "authors": [ "MidnightDust" ],
+
+    "license": "CC0",
+    "icon": "assets/midnightlib/icon.png",
+
+    "environment": "*",
+    "entrypoints": {
+        "main": [
+            "eu.midnightdust.test.fabric.MLExampleFabric"
+        ]
+    },
+    "depends": {
+        "fabric-resource-loader-v0": "*",
+        "midnightlib": ">=1.6.0"
+    }
+}