Expand setMeta to actually set (with tests) (#318)

packages/keyring/src/pair/index.spec.ts

@@ -42,4 +42,14 @@ describe('pair', () => {
       )
     ).toEqual(false);
   });
+
+  it('allows setting/getting of meta', () => {
+    keyring.bob.setMeta({ foo: 'bar', something: 'else' });
+
+    expect(keyring.bob.getMeta()).toMatchObject({ foo: 'bar', something: 'else' });
+
+    keyring.bob.setMeta({ something: 'thing' });
+
+    expect(keyring.bob.getMeta()).toMatchObject({ foo: 'bar', something: 'thing' });
+  });
 });

packages/keyring/src/pair/index.ts

@@ -91,8 +91,8 @@ export default function createPair (type: KeyringPairType, { publicKey, seed }:
     },
     publicKey: (): Uint8Array =>
       publicKey,
-    setMeta: (_meta: KeyringPair$Meta): void => {
-      meta = meta;
+    setMeta: (additional: KeyringPair$Meta): void => {
+      meta = { ...meta, ...additional };
     },
     sign: (message: Uint8Array): Uint8Array =>
       sign(type, message, { publicKey, secretKey }),