add test

Assets/UniGLTF/Tests/UniGLTF/TextureTests.cs

@@ -1,3 +1,5 @@
+using System.IO;
+using System.Linq;
 using NUnit.Framework;
 using UnityEngine;
 using VRMShaders;
@@ -31,5 +33,66 @@ namespace UniGLTF
             Assert.AreEqual(glFilter.LINEAR_MIPMAP_LINEAR, sampler.minFilter);
             Assert.AreEqual(glFilter.LINEAR_MIPMAP_LINEAR, sampler.magFilter);
         }
+
+        static FileInfo Find(DirectoryInfo current, string target)
+        {
+            foreach (var child in current.EnumerateFiles())
+            {
+                if (child.Name == target)
+                {
+                    return child;
+                }
+            }
+
+            foreach (var child in current.EnumerateDirectories())
+            {
+                var found = Find(child, target);
+                if (found != null)
+                {
+                    return found;
+                }
+            }
+
+            return null;
+        }
+
+        static FileInfo GetGltfTestModelPath(string name)
+        {
+            var env = System.Environment.GetEnvironmentVariable("GLTF_SAMPLE_MODELS");
+            if (string.IsNullOrEmpty(env))
+            {
+                return null;
+            }
+            var root = new DirectoryInfo($"{env}/2.0");
+            if (!root.Exists)
+            {
+                return null;
+            }
+
+            return Find(root, name);
+        }
+
+        [Test]
+        public void TextureExtractTest()
+        {
+            var path = GetGltfTestModelPath("BoomBox.glb");
+            if (path == null)
+            {
+                return;
+            }
+
+            // parse
+            var parser = new GltfParser();
+            parser.ParsePath(path.FullName);
+
+            // load
+            var loader = new ImporterContext(parser);
+            loader.Load();
+
+            // extractor
+            var extractor = new TextureExtractor(parser, UnityPath.FromUnityPath(""), loader.TextureFactory.Textures.Select(x => (new SubAssetKey(typeof(Texture2D), x.Texture.name), x.Texture)).ToArray());
+            var m = GltfTextureEnumerator.EnumerateTexturesForMaterial(parser, 0).FirstOrDefault(x => x.Item1.Name == "texture_1.standard");
+            extractor.Extract(m.Item1, m.Item2);
+        }
     }
 }