diff --git a/thermion_dart/test/viewport_gizmo.dart b/thermion_dart/test/viewport_gizmo.dart
new file mode 100644
index 00000000..e0bb9740
--- /dev/null
+++ b/thermion_dart/test/viewport_gizmo.dart
@@ -0,0 +1,81 @@
+import 'dart:io';
+import 'package:thermion_dart/thermion_dart/swift/swift_bindings.g.dart';
+import 'package:thermion_dart/thermion_dart/thermion_viewer.dart';
+import 'package:thermion_dart/thermion_dart/thermion_viewer_ffi.dart';
+import 'package:thermion_dart/thermion_dart/utils/dart_resources.dart';
+import 'package:thermion_dart/thermion_dart/compatibility/compatibility.dart';
+import 'package:test/test.dart';
+import 'package:animation_tools_dart/animation_tools_dart.dart';
+
+/// Test files are run in a variety of ways, find this package root in all.
+///
+/// Test files can be run from source from any working directory. The Dart SDK
+/// `tools/test.py` runs them from the root of the SDK for example.
+///
+/// Test files can be run from dill from the root of package. `package:test`
+/// does this.
+Uri findPackageRoot(String packageName) {
+  final script = Platform.script;
+  final fileName = script.name;
+
+  // We're likely running from source.
+  var directory = script.resolve('.');
+  while (true) {
+    final dirName = directory.name;
+    if (dirName == packageName) {
+      return directory;
+    }
+    final parent = directory.resolve('..');
+    if (parent == directory) break;
+    directory = parent;
+  }
+
+  throw StateError("Could not find package root for package '$packageName'. "
+      'Tried finding the package root via Platform.script '
+      "'${Platform.script.toFilePath()}' and Directory.current "
+      "'${Directory.current.uri.toFilePath()}'.");
+}
+
+extension on Uri {
+  String get name => pathSegments.where((e) => e != '').last;
+}
+
+late String testDir;
+void main() async {
+  final packageUri = findPackageRoot('thermion_dart');
+  testDir = Directory("${packageUri.toFilePath()}/test").path;
+  final lib = ThermionDartTexture1(DynamicLibrary.open(
+      '${packageUri.toFilePath()}/native/lib/macos/swift/libthermion_swift.dylib'));
+  final object = ThermionDartTexture.new1(lib);
+  object.initWithWidth_height_(500, 500);
+
+  final resourceLoader = calloc<ResourceLoaderWrapper>(1);
+  var loadToOut = NativeCallable<
+      Void Function(Pointer<Char>,
+          Pointer<ResourceBuffer>)>.listener(DartResourceLoader.loadResource);
+
+  resourceLoader.ref.loadToOut = loadToOut.nativeFunction;
+  var freeResource = NativeCallable<Void Function(ResourceBuffer)>.listener(
+      DartResourceLoader.freeResource);
+  resourceLoader.ref.freeResource = freeResource.nativeFunction;
+
+  var viewer = ThermionViewerFFI(resourceLoader: resourceLoader.cast<Void>());
+
+  await viewer.initialized;
+  await viewer.createSwapChain(500, 500);
+  await viewer.createRenderTarget(500, 500, object.metalTextureAddress);
+  await viewer.updateViewportAndCameraProjection(500, 500);
+
+  print(await viewer.getCameraFov(true));
+  print(await viewer.getCameraFov(false));
+
+  group('viewport', () {
+    test('viewport', () async {
+      var entity = await viewer
+          .createGeometry([0.0], [0], primitiveType: PrimitiveType.POINTS);
+      await viewer.setCameraPosition(0.0, 0.0, 4.0);
+      await viewer.queueRelativePositionUpdateWorldAxis(
+          entity, -250.0, 250.0, 1, 0, 0);
+    });
+  });
+}