test: add tests for reworked InteractionInput class

test/scripting_api/interaction_input_test.dart

@@ -0,0 +1,36 @@
+// Copyright 2023 Contributors to the Eclipse Foundation. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
+import 'package:dart_wot/scripting_api.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('InteractionInput', () {
+    group('should be able to be instatiated from', () {
+      test('from null', () {
+        final interactionInput = InteractionInput.fromNull();
+
+        expect(interactionInput, isA<DataSchemaValueInput>());
+
+        expect(
+          (interactionInput as DataSchemaValueInput).dataSchemaValue,
+          isA<NullValue>(),
+        );
+      });
+
+      test('from String', () {
+        final interactionInput = InteractionInput.fromString('foo');
+
+        expect(interactionInput, isA<DataSchemaValueInput>());
+
+        expect(
+          (interactionInput as DataSchemaValueInput).dataSchemaValue,
+          isA<StringValue>(),
+        );
+      });
+    });
+  });
+}