Add signet metadata writing test

packages/ordinalsplus/tests/unit/inscriptions/metadata-signet.test.ts

@@ -0,0 +1,36 @@
+import { describe, test, expect } from 'bun:test';
+import { utf8 } from '@scure/base';
+import { createInscription } from '../../../src/inscription';
+
+// Basic metadata object used for tests
+const metadata = {
+  name: 'Test Inscription',
+  description: 'A test inscription with metadata',
+  version: '1.0.0'
+};
+
+describe('Signet Metadata Inscription', () => {
+  test('metadata should be written and retrievable', () => {
+    const result = createInscription({
+      content: 'Hello, world!',
+      contentType: 'text/plain',
+      metadata,
+      network: 'signet'
+    });
+
+    expect(result).toBeDefined();
+    expect(result.inscription.tags.unknown).toBeDefined();
+
+    // Convert unknown tags back to strings
+    const extracted: Record<string, string> = {};
+    result.inscription.tags.unknown?.forEach(([k, v]) => {
+      const key = utf8.encode(k);
+      const value = utf8.encode(v);
+      extracted[key] = value;
+    });
+
+    expect(extracted).toEqual(metadata);
+    // Ensure commit address is a valid signet P2TR address
+    expect(result.commitAddress.address.startsWith('tb1p')).toBe(true);
+  });
+});