add ExpectDo method

Author: ryantate13

expect.go

@@ -27,6 +27,7 @@ type baseMock interface {
 	// MatchExpectationsInOrder gives an option whether to match all expectations in the order they were set or not.
 	MatchExpectationsInOrder(b bool)
 
+	ExpectDo(args ...interface{}) *ExpectedCmd
 	ExpectIntSliceDo(args ...interface{}) *ExpectedIntSlice
 	ExpectIntDo(args ...interface{}) *ExpectedInt
 	ExpectStringSliceDo(args ...interface{}) *ExpectedStringSlice

mock.go

@@ -408,6 +408,13 @@ func (m *mock) ExpectWatch(keys ...string) *ExpectedError {
 	return e
 }
 
+func (m *mock) ExpectDo(args ...interface{}) *ExpectedCmd {
+	e := &ExpectedCmd{}
+	e.cmd = redis.NewCmd(m.ctx, args...)
+	m.pushExpect(e)
+	return e
+}
+
 func (m *mock) ExpectIntSliceDo(args ...interface{}) *ExpectedIntSlice {
 	e := &ExpectedIntSlice{}
 	e.cmd = redis.NewIntSliceCmd(m.ctx, args...)