v2

Add tests
Modify syntax to be clearer
Add Query function

Assets/Plugins/UnityGameMode/Tests/LinuxGameModeTests.cs

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+using System.Collections;
+using System.Collections.Generic;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+
+#if UNITY_EDITOR_LINUX || UNITY_STANDALONE_LINUX
+namespace Tests
+{
+    public class LinuxGameModeTests
+    {
+        [Test]
+        public void GameModeRequestStartWorks()
+        {
+            var ret = LinuxGameMode.GameModeRequestStart();
+            Assert.IsTrue( ret == 0 );
+        }
+        
+        [Test]
+        public void GameModeRequestEndWorks()
+        {
+            var ret = LinuxGameMode.GameModeRequestStart();
+            Assert.IsTrue( ret == 0 );
+            ret = LinuxGameMode.GameModeRequestEnd();
+            Assert.IsTrue( ret == 0 );
+        }
+        
+        [Test]
+        public void GameModeGameModeQueryStatusWorks()
+        {
+            var ret = LinuxGameMode.GameModeRequestStart();
+            Assert.IsTrue( ret == 0 );
+
+            ret = LinuxGameMode.GameModeQueryStatus();
+            Assert.IsTrue( ret == 2 );
+            
+            ret = LinuxGameMode.GameModeRequestEnd();
+            Assert.IsTrue( ret == 0 );
+        }
+    }
+}
+#endif

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Assets/Plugins/UnityGameMode/Tests/Tests.asmdef

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+{
+    "name": "Tests",
+    "references": [
+        "UnityGameMode"
+    ],
+    "optionalUnityReferences": [
+        "TestAssemblies"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": []
+}

Assets/Plugins/UnityGameMode/Tests/Tests.asmdef.meta

@@ -0,0 +1,7 @@
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