Add plugin slash command support (#7941)

* add plugin slash command support

* remove unused string

* rebase

plugin/plugintest/api.go

@@ -30,6 +30,22 @@ func (m *API) LoadPluginConfiguration(dest interface{}) error {
 	return ret.Error(0)
 }
 
+func (m *API) RegisterCommand(command *model.Command) error {
+	ret := m.Called(command)
+	if f, ok := ret.Get(0).(func(*model.Command) error); ok {
+		return f(command)
+	}
+	return ret.Error(0)
+}
+
+func (m *API) UnregisterCommand(teamId, trigger string) error {
+	ret := m.Called(teamId, trigger)
+	if f, ok := ret.Get(0).(func(string, string) error); ok {
+		return f(teamId, trigger)
+	}
+	return ret.Error(0)
+}
+
 func (m *API) CreateUser(user *model.User) (*model.User, *model.AppError) {
 	ret := m.Called(user)
 	if f, ok := ret.Get(0).(func(*model.User) (*model.User, *model.AppError)); ok {

plugin/plugintest/hooks.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/stretchr/testify/mock"
 
+	"github.com/mattermost/mattermost-server/model"
 	"github.com/mattermost/mattermost-server/plugin"
 )
 
@@ -18,7 +19,11 @@ type Hooks struct {
 var _ plugin.Hooks = (*Hooks)(nil)
 
 func (m *Hooks) OnActivate(api plugin.API) error {
-	return m.Called(api).Error(0)
+	ret := m.Called(api)
+	if f, ok := ret.Get(0).(func(plugin.API) error); ok {
+		return f(api)
+	}
+	return ret.Error(0)
 }
 
 func (m *Hooks) OnDeactivate() error {
@@ -32,3 +37,13 @@ func (m *Hooks) OnConfigurationChange() error {
 func (m *Hooks) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	m.Called(w, r)
 }
+
+func (m *Hooks) ExecuteCommand(args *model.CommandArgs) (*model.CommandResponse, *model.AppError) {
+	ret := m.Called(args)
+	if f, ok := ret.Get(0).(func(*model.CommandArgs) (*model.CommandResponse, *model.AppError)); ok {
+		return f(args)
+	}
+	resp, _ := ret.Get(0).(*model.CommandResponse)
+	err, _ := ret.Get(1).(*model.AppError)
+	return resp, err
+}