Added game tests

Author: emyfops

build.gradle.kts

@@ -75,6 +75,18 @@ repositories {
     }
 }
 
+fabricApi {
+    configureTests {
+        modId = "${base.archivesName}-tests"
+        eula = true
+        createSourceSet = true
+
+        enableGameTests = false
+        enableClientGameTests = true
+        clearRunDirectory = false
+    }
+}
+
 loom {
     accessWidenerPath = file("src/main/resources/$modId.accesswidener")
 

src/gametest/kotlin/com/lambda/LambdaTest.kt

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2025 Lambda
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.lambda
+
+import com.lambda.context.SafeContext
+import com.lambda.threading.runSafe
+import com.lambda.util.combat.DamageUtils.isFallDeadly
+import net.fabricmc.fabric.api.client.gametest.v1.FabricClientGameTest
+import net.fabricmc.fabric.api.client.gametest.v1.context.ClientGameTestContext
+import net.minecraft.client.gui.screen.world.WorldCreator
+
+@Suppress("UnstableApiUsage")
+object LambdaTest : FabricClientGameTest {
+    override fun runTest(context: ClientGameTestContext) {
+        val singleplayerContext = context.worldBuilder()
+            .adjustSettings {
+                it.gameMode = WorldCreator.Mode.CREATIVE
+            }
+            .create()
+
+        val world = singleplayerContext.clientWorld
+        val server = singleplayerContext.server
+
+        world.waitForChunksDownload()
+
+        server.runCommand("/tp Steve ~ ~30 ~")
+        context.unit("assert deadly fall") { isFallDeadly() }
+
+        server.runCommand("/tp Steve ~ -50 ~")
+        context.unit("assert safe fall") { !isFallDeadly() }
+        server.runCommand("/tp Steve ~ -60 ~")
+
+        // All the tests passed
+        singleplayerContext.close()
+    }
+
+    inline fun ClientGameTestContext.unit(label: String, crossinline block: SafeContext.() -> Boolean) {
+        waitTick()
+
+        runOnClient<IllegalStateException> {
+            val asserted = runSafe(block)
+                ?: throw IllegalStateException("Could not run in a safe context")
+
+            check(asserted) { "Assertion failed: $label" }
+        }
+    }
+}

src/gametest/resources/fabric.mod.json

@@ -0,0 +1,15 @@
+{
+  "schemaVersion": 1,
+  "id": "lambda-tests",
+  "version": "1.0.0",
+  "name": "Lambda Fabric gametest entrypoint",
+  "environment": "*",
+  "entrypoints": {
+    "fabric-client-gametest": [
+      {
+        "adapter": "kotlin",
+        "value": "com.lambda.LambdaTest"
+      }
+    ]
+  }
+}