tsk-12: Added endpoint to get message (#18)

Closes #12

Reviewed-on: phoenix/textsender-api#18
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

internal/handler/mock_store_test.go

@@ -158,6 +158,36 @@ func (m *MockMessageStore) CreateMessage(ctx context.Context, msg *message.Messa
 	return nil
 }
 
+func (m *MockMessageStore) GetAllMessages(ctx context.Context) ([]*message.Message, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	if m.Error != nil {
+		return nil, m.Error
+	}
+
+	var msgs []*message.Message
+
+	for _, msg := range m.Messages {
+		msgs = append(msgs, msg)
+	}
+
+	return msgs, nil
+}
+
+func (m *MockMessageStore) GetMessageByID(ctx context.Context, id uuid.UUID) (*message.Message, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	if m.Error != nil {
+		return nil, m.Error
+	}
+
+	msg := m.Messages[id]
+
+	return msg, nil
+}
+
 func (m *MockMessageStore) MessageExists(ctx context.Context, msg *message.Message) (bool, error) {
 	m.mu.Lock()
 	defer m.mu.Unlock()