Fix tests

packages/light.js/src/rpc/other/post.ts

@@ -48,11 +48,11 @@ function getTransactionReceipt (transactionHash: string, api: any) {
  * @return - The status of the transaction: (estimated), signed, sent, confirmed
  */
 export function post$ (tx: Tx, options: PostOptions) {
-  const { estimate, passphrase, provider } = options;
-  if (!passphrase) {
+  if (!options || !options.passphrase) {
     throw new Error('The passphrase is missing from the options');
   }
 
+  const { estimate, passphrase, provider } = options;
   const api = provider ? createApiFromProvider(provider) : getApi();
 
   const source$ = Observable.create(async (observer: Observer<TxStatus>) => {

packages/light.js/src/rpc/rpc.spec.ts

@@ -29,20 +29,22 @@ const testRpc = (name: string, rpc$: RpcObservable<any, any>) =>
       setApi(resolveApi());
     });
 
+    const options = name === 'post$' ? { passphrase: 'passphrase' } : {};
+
     it('should be a function', () => {
       expect(typeof rpc$).toBe('function');
     });
 
     it('should return an Observable', () => {
-      expect(isObservable(rpc$({}))).toBe(true);
+      expect(isObservable(rpc$({}, options))).toBe(true);
     });
 
     it('result Observable should be subscribable', () => {
-      expect(() => rpc$({}).subscribe()).not.toThrow();
+      expect(() => rpc$({}, options).subscribe()).not.toThrow();
     });
 
     it('result Observable should return values', done => {
-      rpc$({}).subscribe(data => {
+      rpc$({}, options).subscribe(data => {
         expect(data).not.toBeNull();
         done();
       });