accounts: safe check of pendingPayments in tests

In this commit, we avoid race conditions that can happen for tests that
directly access the service's `pendingPayment` map.

accounts/service.go

@@ -860,6 +860,18 @@ func (s *InterceptorService) removePayment(ctx context.Context,
 	return nil
 }
 
+// hasPayment returns true if the payment is currently being tracked by the
+// service.
+//
+// NOTE: this is currently used only for tests.
+func (s *InterceptorService) hasPayment(hash lntypes.Hash) bool {
+	s.RLock()
+	defer s.RUnlock()
+
+	_, ok := s.pendingPayments[hash]
+	return ok
+}
+
 // successState returns true if a payment was completed successfully.
 func successState(status lnrpc.Payment_PaymentStatus) bool {
 	return status == lnrpc.Payment_SUCCEEDED

accounts/service_test.go

@@ -383,13 +383,14 @@ func TestAccountService(t *testing.T) {
 			// Assert that the invoice subscription succeeded.
 			require.Contains(t, s.invoiceToAccount, testHash)
 
-			// But setting up the payment tracking should have failed.
+			// But setting up the payment tracking should have
+			// failed.
 			require.False(t, s.IsRunning())
 
-			// Finally let's assert that we didn't successfully add the
-			// payment to pending payment, and that lnd isn't awaiting
-			// the payment request.
-			require.NotContains(t, s.pendingPayments, testHash)
+			// Finally let's assert that we didn't successfully add
+			// the payment to pending payment, and that lnd isn't
+			// awaiting the payment request.
+			require.False(t, s.hasPayment(testHash))
 			r.assertNoPaymentRequest(t)
 		},
 	}, {
@@ -426,7 +427,9 @@ func TestAccountService(t *testing.T) {
 			// This will cause an error send an update over
 			// the payment channel, which should disable the
 			// service.
-			s.pendingPayments = make(map[lntypes.Hash]*trackedPayment)
+			s.pendingPayments = make(
+				map[lntypes.Hash]*trackedPayment,
+			)
 
 			// Send an invalid payment over the payment chan
 			// which should error and disable the service
@@ -568,7 +571,7 @@ func TestAccountService(t *testing.T) {
 				return p.Status == lnrpc.Payment_FAILED
 			})
 
-			require.NotContains(t, s.pendingPayments, testHash2)
+			require.False(t, s.hasPayment(testHash2))
 
 			// Finally, if an unknown payment turns out to be
 			// a non-initiated payment, we should stop the tracking
@@ -616,7 +619,7 @@ func TestAccountService(t *testing.T) {
 
 			// Ensure that the payment was removed from the pending
 			// payments.
-			require.NotContains(t, s.pendingPayments, testHash3)
+			require.False(t, s.hasPayment(testHash3))
 		},
 	}, {
 		name: "keep track of invoice indexes",