PLT-7818 Updates to post type (#7579)

* Updates to post type

* Update tests

app/command_test.go

@@ -45,3 +45,23 @@ func TestMoveCommand(t *testing.T) {
 	assert.Nil(t, err)
 	assert.EqualValues(t, targetTeam.Id, retrievedCommand.TeamId)
 }
+
+func TestCreateCommandPost(t *testing.T) {
+	th := Setup().InitBasic()
+	defer th.TearDown()
+
+	post := &model.Post{
+		ChannelId: th.BasicChannel.Id,
+		UserId:    th.BasicUser.Id,
+		Type:      model.POST_SYSTEM_GENERIC,
+	}
+
+	resp := &model.CommandResponse{
+		Text: "some message",
+	}
+
+	_, err := th.App.CreateCommandPost(post, th.BasicTeam.Id, resp)
+	if err == nil && err.Id != "api.context.invalid_param.app_error" {
+		t.Fatal("should have failed - bad post type")
+	}
+}