test(channelserver): add mock-based handler unit tests

Leverage the new repository interfaces to test handler logic without
a database. Adds shared mock implementations (achievement, mail,
character, goocoo, guild) and 32 new handler tests covering
achievement, mail, cafe/boost, and goocoo handlers.

server/channelserver/handlers_goocoo_test.go

@@ -0,0 +1,150 @@
+package channelserver
+
+import (
+	"testing"
+
+	"erupe-ce/network/mhfpacket"
+)
+
+func TestHandleMsgMhfEnumerateGuacot_Empty(t *testing.T) {
+	server := createMockServer()
+	mock := newMockGoocooRepo()
+	server.goocooRepo = mock
+	session := createMockSession(1, server)
+
+	pkt := &mhfpacket.MsgMhfEnumerateGuacot{AckHandle: 100}
+
+	handleMsgMhfEnumerateGuacot(session, pkt)
+
+	select {
+	case p := <-session.sendPackets:
+		if len(p.data) < 4 {
+			t.Fatal("Response too short")
+		}
+	default:
+		t.Error("No response packet queued")
+	}
+}
+
+func TestHandleMsgMhfEnumerateGuacot_WithSlots(t *testing.T) {
+	server := createMockServer()
+	mock := newMockGoocooRepo()
+	mock.slots[0] = []byte{0x01, 0x02, 0x03, 0x04} // slot 0 has data
+	mock.slots[2] = []byte{0x05, 0x06, 0x07, 0x08} // slot 2 has data
+	server.goocooRepo = mock
+	session := createMockSession(1, server)
+
+	pkt := &mhfpacket.MsgMhfEnumerateGuacot{AckHandle: 100}
+
+	handleMsgMhfEnumerateGuacot(session, pkt)
+
+	select {
+	case p := <-session.sendPackets:
+		// Header (4 bytes) + 2 goocoo entries
+		if len(p.data) < 8 {
+			t.Errorf("Response too short: %d bytes", len(p.data))
+		}
+	default:
+		t.Error("No response packet queued")
+	}
+}
+
+func TestHandleMsgMhfUpdateGuacot_ClearSlot(t *testing.T) {
+	server := createMockServer()
+	mock := newMockGoocooRepo()
+	mock.slots[1] = []byte{0x01, 0x02} // pre-existing data
+	server.goocooRepo = mock
+	session := createMockSession(1, server)
+
+	pkt := &mhfpacket.MsgMhfUpdateGuacot{
+		AckHandle: 100,
+		Goocoos: []mhfpacket.Goocoo{
+			{
+				Index: 1,
+				Data1: []int16{0, 0, 0}, // First byte 0 = clear
+				Data2: []uint32{0},
+				Name:  []byte("test"),
+			},
+		},
+	}
+
+	handleMsgMhfUpdateGuacot(session, pkt)
+
+	if len(mock.clearCalled) != 1 || mock.clearCalled[0] != 1 {
+		t.Errorf("Expected ClearSlot(1), got %v", mock.clearCalled)
+	}
+
+	select {
+	case <-session.sendPackets:
+	default:
+		t.Error("No response packet queued")
+	}
+}
+
+func TestHandleMsgMhfUpdateGuacot_SaveSlot(t *testing.T) {
+	server := createMockServer()
+	mock := newMockGoocooRepo()
+	server.goocooRepo = mock
+	session := createMockSession(1, server)
+
+	pkt := &mhfpacket.MsgMhfUpdateGuacot{
+		AckHandle: 100,
+		Goocoos: []mhfpacket.Goocoo{
+			{
+				Index: 2,
+				Data1: []int16{1, 2, 3}, // First byte non-zero = save
+				Data2: []uint32{100, 200},
+				Name:  []byte("MyGoocoo"),
+			},
+		},
+	}
+
+	handleMsgMhfUpdateGuacot(session, pkt)
+
+	if _, ok := mock.savedSlots[2]; !ok {
+		t.Error("Expected SaveSlot to be called for slot 2")
+	}
+	if len(mock.clearCalled) != 0 {
+		t.Error("ClearSlot should not be called for a save operation")
+	}
+
+	select {
+	case <-session.sendPackets:
+	default:
+		t.Error("No response packet queued")
+	}
+}
+
+func TestHandleMsgMhfUpdateGuacot_SkipInvalidIndex(t *testing.T) {
+	server := createMockServer()
+	mock := newMockGoocooRepo()
+	server.goocooRepo = mock
+	session := createMockSession(1, server)
+
+	pkt := &mhfpacket.MsgMhfUpdateGuacot{
+		AckHandle: 100,
+		Goocoos: []mhfpacket.Goocoo{
+			{
+				Index: 5, // > 4, should be skipped
+				Data1: []int16{1},
+				Data2: []uint32{0},
+				Name:  []byte("Bad"),
+			},
+		},
+	}
+
+	handleMsgMhfUpdateGuacot(session, pkt)
+
+	if len(mock.savedSlots) != 0 {
+		t.Error("SaveSlot should not be called for index > 4")
+	}
+	if len(mock.clearCalled) != 0 {
+		t.Error("ClearSlot should not be called for index > 4")
+	}
+
+	select {
+	case <-session.sendPackets:
+	default:
+		t.Error("No response packet queued")
+	}
+}