[MM-16709] Add helper method for plugins using MessageHasBeenPosted (#12539)

The PR introduces a method in helper interface. The method has common code for filtering to be used across plugins which use MessageHasBeenPosted.

plugin/plugintest/helpers.go

@@ -133,3 +133,31 @@ func (_m *Helpers) KVSetWithExpiryJSON(key string, value interface{}, expireInSe
 
 	return r0
 }
+
+// ShouldProcessMessage provides a mock function with given fields: post, options
+func (_m *Helpers) ShouldProcessMessage(post *model.Post, options ...plugin.ShouldProcessMessageOption) (bool, error) {
+	_va := make([]interface{}, len(options))
+	for _i := range options {
+		_va[_i] = options[_i]
+	}
+	var _ca []interface{}
+	_ca = append(_ca, post)
+	_ca = append(_ca, _va...)
+	ret := _m.Called(_ca...)
+
+	var r0 bool
+	if rf, ok := ret.Get(0).(func(*model.Post, ...plugin.ShouldProcessMessageOption) bool); ok {
+		r0 = rf(post, options...)
+	} else {
+		r0 = ret.Get(0).(bool)
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(*model.Post, ...plugin.ShouldProcessMessageOption) error); ok {
+		r1 = rf(post, options...)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}