Merge pull request #939 from oocytanb/fix/m17n_value_caching

Fix incorrect value caching of M17N

Assets/UniGLTF/Editor/UniGLTF/ExportDialog/M17N.cs

@@ -61,7 +61,7 @@ public static string Get(Languages language, T key)
                 {
                     var match = GetAttribute(value, language);
                     // Attribute。無かったら enum の ToString
-                    map.Add(value, match != null ? match.Message : key.ToString());
+                    map.Add(value, match != null ? match.Message : value.ToString());
                 }
 
                 s_cache.Add(language, map);

Assets/UniGLTF/Tests/UniGLTF/M17NTest.cs

@@ -0,0 +1,29 @@
+using NUnit.Framework;
+using UniGLTF.M17N;
+using UnityEngine;
+
+namespace UniGLTF
+{
+    public class M17NTest
+    {
+        enum M17NTestEnum
+        {
+            Foo,
+            Bar,
+            Baz,
+        }
+
+        [Test]
+        public void SimpleMsgTest()
+        {
+            Assert.AreEqual("Foo", M17NTestEnum.Foo.Msg());
+            Assert.AreEqual("Bar", M17NTestEnum.Bar.Msg());
+            Assert.AreEqual("Baz", M17NTestEnum.Baz.Msg());
+
+            // test caching
+            Assert.AreEqual("Foo", M17NTestEnum.Foo.Msg());
+            Assert.AreEqual("Bar", M17NTestEnum.Bar.Msg());
+            Assert.AreEqual("Baz", M17NTestEnum.Baz.Msg());
+        }
+    }
+}