Address more comments

lib/retry/retry_test.go

@@ -0,0 +1,25 @@
+package retry
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"golang.org/x/xerrors"
+
+	"github.com/filecoin-project/go-jsonrpc"
+)
+
+func TestRetryErrorIsInTrue(t *testing.T) {
+	errorsToRetry := []error{&jsonrpc.RPCConnectionError{}}
+	require.True(t, ErrorIsIn(&jsonrpc.RPCConnectionError{}, errorsToRetry))
+}
+
+func TestRetryErrorIsInFalse(t *testing.T) {
+	errorsToRetry := []error{&jsonrpc.RPCConnectionError{}}
+	require.False(t, ErrorIsIn(xerrors.Errorf("random error"), errorsToRetry))
+}
+
+func TestRetryWrappedErrorIsInTrue(t *testing.T) {
+	errorsToRetry := []error{&jsonrpc.RPCConnectionError{}}
+	require.True(t, ErrorIsIn(xerrors.Errorf("wrapped: %w", &jsonrpc.RPCConnectionError{}), errorsToRetry))
+}