add test for native context creation

package/example/Tests/native-contexts-tests.ts

@@ -0,0 +1,36 @@
+import NativeSampleModule from "sample-native-module/js/NativeSampleModule";
+import { Worklets, type IWorkletContext } from "react-native-worklets-core";
+import { Platform } from "react-native";
+
+export const native_contexts_tests = {
+  // This test has to run first, so that the default context / RNWC API isn't initialized yet from the JS side
+  call_custom_worklet_context_first: async () => {
+    // Check if the native module is available
+    if (NativeSampleModule == null) {
+      if (Platform.OS === "android") {
+        console.warn(
+          "NativeSampleModule is only implemented on iOS currently."
+        );
+        return;
+      } else {
+        throw new Error(
+          "NativeSampleModule is not available. Something went wrong with the native module setup."
+        );
+      }
+    }
+
+    // Note to library authors: We call on our custom native context before the Worklets API is initialized.
+    // RNWC is a lazy-loaded turbo module, so it will only be available once we call it in JS once.
+    // We call any property on the Worklets object to initialize it:
+    Worklets.defaultContext;
+
+    const context =
+      NativeSampleModule.createCustomWorkletContext() as IWorkletContext;
+    // Bug: this will never resolve (as it throws an error, which is swallowed [which is another bug])
+    await context.runAsync(() => {
+      "worklet";
+      console.log("ctx: test: running worklet");
+      return 100;
+    });
+  },
+};

package/example/Tests/tests.ts

@@ -2,9 +2,11 @@ import { worklet_tests } from "./worklet-tests";
 import { sharedvalue_tests } from "./sharedvalue-tests";
 import { wrapper_tests } from "./wrapper-tests";
 import { worklet_context_tests } from "./worklet-context-tests";
+import { native_contexts_tests } from "./native-contexts-tests";
 
 export const Tests: { [key: string]: { [key: string]: () => Promise<void> } } =
   {
+    NativeContexts: { ...native_contexts_tests },
     Worklets: { ...worklet_tests },
     Contexts: { ...worklet_context_tests },
     SharedValues: { ...sharedvalue_tests },