Add tests for @fantom_hermes_variant (#51457)

Summary:
Pull Request resolved: #51457

See title

Changelog: [Internal]

Reviewed By: rubennorte

Differential Revision: D74999954

fbshipit-source-id: bd140b2df71477e2966406ed612a00ff3ea6de8b

Author: Nick Lefever

packages/react-native-fantom/src/__tests__/FantomHermesVariantStaticHermes-itest.js

@@ -0,0 +1,18 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ * @fantom_hermes_variant static_hermes
+ */
+
+declare var HermesInternal: $HermesInternalType;
+
+describe('"@fantom_hermes_variant static_hermes" in docblock', () => {
+  it('should use Static Hermes', () => {
+    expect(HermesInternal.getRuntimeProperties?.()['Static Hermes']).toBe(true);
+  });
+});

packages/react-native-fantom/src/__tests__/FantomHermesVariantStaticHermesExperimental-itest.js

@@ -0,0 +1,18 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ * @fantom_hermes_variant static_hermes_experimental
+ */
+
+declare var HermesInternal: $HermesInternalType;
+
+describe('"@fantom_hermes_variant static_hermes" in docblock', () => {
+  it('should use Static Hermes', () => {
+    expect(HermesInternal.getRuntimeProperties?.()['Static Hermes']).toBe(true);
+  });
+});