test: add essential unit tests for core functionality (resolve #6)

mocks/alias_repository.go

@@ -0,0 +1,15 @@
+package mocks
+
+import (
+	"github.com/muety/wakapi/models"
+	"github.com/stretchr/testify/mock"
+)
+
+type AliasRepositoryMock struct {
+	mock.Mock
+}
+
+func (m *AliasRepositoryMock) GetByUser(s string) ([]*models.Alias, error) {
+	args := m.Called(s)
+	return args.Get(0).([]*models.Alias), args.Error(1)
+}