diff --git a/service/slack/slack_service_test.go b/service/slack/slack_service_test.go
new file mode 100644
index 0000000..f603697
--- /dev/null
+++ b/service/slack/slack_service_test.go
@@ -0,0 +1,216 @@
+package slack
+
+import (
+	"errors"
+	"github.com/slack-go/slack"
+	"github.com/stretchr/testify/suite"
+	"houston/logger"
+	"houston/mocks"
+	"testing"
+)
+
+type SlackServiceSuite struct {
+	suite.Suite
+	SlackService            *SlackService
+	SocketModeClientWrapper mocks.ISocketModeClientWrapperMock
+}
+
+func (suite *SlackServiceSuite) Test_SendDM_FailureCase() {
+	suite.SocketModeClientWrapper.PostMessageMock.Return("", "", GetMockSlackError())
+
+	err := suite.SlackService.SendDM(GetMockRecipientID(), GetMockMessageText())
+	suite.Error(err, "service must throw error")
+}
+
+func (suite *SlackServiceSuite) Test_SendDM_SuccessCase() {
+	suite.SocketModeClientWrapper.PostMessageMock.Return(GetMockChannelID(), GetMockTimeStamp(), nil)
+
+	err := suite.SlackService.SendDM(GetMockRecipientID(), GetMockMessageText())
+	suite.NoError(err, "service must not throw error")
+}
+
+func (suite *SlackServiceSuite) Test_PostMessage_FailureCase() {
+	suite.SocketModeClientWrapper.PostMessageMock.Return("", "", GetMockSlackError())
+
+	timeStamp, err := suite.SlackService.PostMessage(GetMockMessageText(), false, GetMockChannel())
+	suite.Error(err, "service must throw error")
+	suite.Empty(timeStamp, "timeStamp must be empty")
+}
+
+func (suite *SlackServiceSuite) Test_PostMessage_SuccessCase() {
+	suite.SocketModeClientWrapper.PostMessageMock.Return(GetMockChannelID(), GetMockTimeStamp(), nil)
+
+	timeStamp, err := suite.SlackService.PostMessage(GetMockMessageText(), false, GetMockChannel())
+	suite.NoError(err, "service must not throw error")
+	suite.NotEmpty(timeStamp, "timeStamp must not be empty")
+}
+
+func (suite *SlackServiceSuite) Test_PostMessageOption_FailureCase() {
+	suite.SocketModeClientWrapper.PostMessageMock.Return("", "", GetMockSlackError())
+
+	timeStamp, err := suite.SlackService.PostMessageOption(GetMockChannelID(), GetMockMessageOption())
+	suite.Error(err, "service must throw error")
+	suite.Empty(timeStamp, "timeStamp must be empty")
+}
+
+func (suite *SlackServiceSuite) Test_PostMessageOption_SuccessCase() {
+	suite.SocketModeClientWrapper.PostMessageMock.Return(GetMockChannelID(), GetMockTimeStamp(), nil)
+
+	timeStamp, err := suite.SlackService.PostMessageOption(GetMockChannelID(), GetMockMessageOption())
+	suite.NoError(err, "service must not throw error")
+	suite.NotEmpty(timeStamp, "timeStamp must not be empty")
+}
+
+func (suite *SlackServiceSuite) Test_UploadFileByPath_FailureCase() {
+	suite.SocketModeClientWrapper.UploadFileMock.Return(nil, GetMockSlackError())
+
+	file, err := suite.SlackService.UploadFileByPath(GetMockFilePath(), GetMockChannelID())
+	suite.Error(err, "service must throw error")
+	suite.Nil(file, "file must be nil")
+}
+
+func (suite *SlackServiceSuite) Test_UploadFileByPath_SuccessCase() {
+	suite.SocketModeClientWrapper.UploadFileMock.Return(&slack.File{}, nil)
+
+	file, err := suite.SlackService.UploadFileByPath(GetMockFilePath(), GetMockChannelID())
+	suite.NoError(err, "service must not throw error")
+	suite.NotNil(file, "file must not be nil")
+}
+
+func (suite *SlackServiceSuite) Test_PostMessageByChannelID_FailureCase() {
+	suite.SocketModeClientWrapper.PostMessageMock.Return("", "", GetMockSlackError())
+
+	timeStamp, err := suite.SlackService.PostMessageByChannelID(GetMockMessageText(), false, GetMockChannelID())
+	suite.Error(err, "service must throw error")
+	suite.Empty(timeStamp, "timeStamp must be empty")
+}
+
+func (suite *SlackServiceSuite) Test_PostMessageByChannelID_SuccessCase() {
+	suite.SocketModeClientWrapper.PostMessageMock.Return(GetMockChannelID(), GetMockTimeStamp(), nil)
+
+	timeStamp, err := suite.SlackService.PostMessageByChannelID(GetMockMessageText(), false, GetMockChannelID())
+	suite.NoError(err, "service must not throw error")
+	suite.NotEmpty(timeStamp, "timeStamp must not be empty")
+}
+
+func (suite *SlackServiceSuite) Test_PostMessageWithAttachments_FailureCase() {
+	suite.SocketModeClientWrapper.PostMessageMock.Return("", "", GetMockSlackError())
+
+	timeStamp, err := suite.SlackService.PostMessageWithAttachments(GetMockChannelID(), GetMockAttachment())
+	suite.Error(err, "service must throw error")
+	suite.Empty(timeStamp, "timeStamp must be empty")
+}
+
+func (suite *SlackServiceSuite) Test_PostMessageWithAttachments_SuccessCase() {
+	suite.SocketModeClientWrapper.PostMessageMock.Return(GetMockChannelID(), GetMockTimeStamp(), nil)
+
+	timeStamp, err := suite.SlackService.PostMessageWithAttachments(GetMockChannelID(), GetMockAttachment())
+	suite.NoError(err, "service must not throw error")
+	suite.NotEmpty(timeStamp, "timeStamp must not be empty")
+}
+
+func (suite *SlackServiceSuite) Test_UpdateMessageWithAttachments_FailureCase() {
+	suite.SocketModeClientWrapper.UpdateMessageMock.Return("", "", "", GetMockSlackError())
+
+	err := suite.SlackService.UpdateMessageWithAttachments(GetMockChannelID(), GetMockTimeStamp(), GetMockAttachment())
+	suite.Error(err, "service must throw error")
+}
+
+func (suite *SlackServiceSuite) Test_UpdateMessageWithAttachments_SuccessCase() {
+	suite.SocketModeClientWrapper.UpdateMessageMock.Return("", "", "", nil)
+
+	err := suite.SlackService.UpdateMessageWithAttachments(GetMockChannelID(), GetMockTimeStamp(), GetMockAttachment())
+	suite.NoError(err, "service must not throw error")
+}
+
+func (suite *SlackServiceSuite) Test_PostEphemeralByChannelID_FailureCase() {
+	suite.SocketModeClientWrapper.PostEphemeralMock.Return("", GetMockSlackError())
+
+	err := suite.SlackService.PostEphemeralByChannelID(GetMockMessageText(), GetMockRecipientID(), false, GetMockChannelID())
+	suite.Error(err, "service must throw error")
+}
+
+func (suite *SlackServiceSuite) Test_PostEphemeralByChannelID_SuccessCase() {
+	suite.SocketModeClientWrapper.PostEphemeralMock.Return(GetMockTimeStamp(), nil)
+
+	err := suite.SlackService.PostEphemeralByChannelID(GetMockMessageText(), GetMockRecipientID(), false, GetMockChannelID())
+	suite.NoError(err, "service must not throw error")
+}
+
+func (suite *SlackServiceSuite) Test_PostMessageBlocks_FailureCase() {
+	suite.SocketModeClientWrapper.PostMessageMock.Return("", "", GetMockSlackError())
+
+	timeStamp, err := suite.SlackService.PostMessageBlocks(GetMockChannelID(), GetMockBlock(), GetMockColor())
+	suite.Error(err, "service must throw error")
+	suite.Empty(timeStamp, "timeStamp must be empty")
+}
+
+func (suite *SlackServiceSuite) Test_PostMessageBlocks_SuccessCase() {
+	suite.SocketModeClientWrapper.PostMessageMock.Return(GetMockChannelID(), GetMockTimeStamp(), nil)
+
+	timeStamp, err := suite.SlackService.PostMessageBlocks(GetMockChannelID(), GetMockBlock(), GetMockColor())
+	suite.NoError(err, "service must not throw error")
+	suite.NotEmpty(timeStamp, "timeStamp must not be empty")
+}
+
+func GetMockMessageText() string {
+	return "Hello World!"
+}
+
+func GetMockMessageOption() slack.MsgOption {
+	return slack.MsgOptionText(GetMockMessageText(), false)
+}
+
+func GetMockChannelID() string {
+	return "C123"
+}
+
+func GetMockRecipientID() string {
+	return "U123"
+}
+
+func GetMockTimeStamp() string {
+	return "1234"
+}
+
+func GetMockSlackError() error {
+	return errors.New("failed to send message")
+}
+
+func GetMockFilePath() string {
+	return "mock/file/path"
+}
+
+func GetMockAttachment() slack.Attachment {
+	return slack.Attachment{}
+}
+
+func GetMockBlock() slack.Blocks {
+	return slack.Blocks{}
+}
+
+func GetMockColor() string {
+	return "red"
+}
+
+func GetMockChannel() *slack.Channel {
+	return &slack.Channel{
+		GroupConversation: slack.GroupConversation{},
+		IsChannel:         true,
+		IsGeneral:         true,
+		IsMember:          true,
+		Locale:            "",
+	}
+}
+
+func (suite *SlackServiceSuite) SetupSuite() {
+	logger.InitLogger()
+	suite.SocketModeClientWrapper = *mocks.NewISocketModeClientWrapperMock(suite.T())
+	suite.SlackService = &SlackService{
+		SocketModeClientWrapper: &suite.SocketModeClientWrapper,
+	}
+}
+
+func TestSlackServiceSuite(t *testing.T) {
+	suite.Run(t, new(SlackServiceSuite))
+}