added unit tests to test serialization and cached model3d content

vitrivr-engine-module-m3d/src/test/kotlin/org/vitrivr/engine/model3d/SerializationTest.kt

@@ -0,0 +1,57 @@
+package org.vitrivr.engine.model3d
+
+import kotlinx.serialization.encodeToString
+import kotlinx.serialization.json.Json
+import org.junit.jupiter.api.Assertions
+import org.junit.jupiter.api.Test
+import org.vitrivr.engine.core.model.content.impl.cache.CachedModel3dContent
+import org.vitrivr.engine.core.model.mesh.texturemodel.Material
+import org.vitrivr.engine.core.model.mesh.texturemodel.Model3d
+import java.io.File
+import kotlin.io.path.Path
+
+/**
+ * Unit tests to check the serialization of 3D models.
+ *
+ * @author Rahel Arnold
+ * @version 1.0.0
+ */
+class SerializationTest {
+    /*
+        * Tests if a 3D model is identical to after serialization and deserialization.
+     */
+    @Test
+    fun serialization() {
+        val loader = ModelLoader()
+        val model = this::class.java.getResourceAsStream("/bunny.obj").use { inp ->
+            loader.loadModel("bunny", inp!!)
+        } ?: Assertions.fail("Failed to load model.")
+
+        /* Serialize and deserialize model. */
+        val serialized = Json.encodeToString(model)
+        val deserialized = Json.decodeFromString<Model3d>(serialized)
+
+        /* Check if original and deserialized models are the same. */
+        Assertions.assertEquals(model, deserialized)
+    }
+
+    /**
+     * Tests if a 3D model is identical to reloaded one from cache.
+     */
+    @Test
+    fun cachedModel() {
+        val tmpPath = Path("./model.json")/* Load model. */
+        val loader = ModelLoader()
+        val model = this::class.java.getResourceAsStream("/bunny.obj").use { inp ->
+            loader.loadModel("bunny", inp!!)
+        } ?: Assertions.fail("Failed to load model.")
+
+        /* Serialize and deserialize model. */
+        val cachedModel3dContent = CachedModel3dContent(tmpPath, model)
+        val file = File(tmpPath.toString())
+        file.delete()
+
+        /* Check if original and deserialized models are the same. */
+        Assertions.assertEquals(model, cachedModel3dContent.content)
+    }
+}