diff --git a/service/account_test.go b/service/account_test.go
new file mode 100644
index 00000000..7ebbc1ce
--- /dev/null
+++ b/service/account_test.go
@@ -0,0 +1,42 @@
+package service
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/ybkuroki/go-webapp-sample/model"
+	"github.com/ybkuroki/go-webapp-sample/test"
+)
+
+func TestAuthenticateByUsernameAndPassword_Success(t *testing.T) {
+	container := test.PrepareForServiceTest()
+
+	service := NewAccountService(container)
+	result, account := service.AuthenticateByUsernameAndPassword("test", "test")
+
+	a := model.Account{}
+	data, _ := a.FindByName(container.GetRepository(), "test")
+
+	assert.Equal(t, data, account)
+	assert.Equal(t, true, result)
+}
+
+func TestAuthenticateByUsernameAndPassword_EntityNotFound(t *testing.T) {
+	container := test.PrepareForServiceTest()
+
+	service := NewAccountService(container)
+	result, account := service.AuthenticateByUsernameAndPassword("abcde", "abcde")
+
+	assert.Equal(t, (*model.Account)(nil), account)
+	assert.Equal(t, false, result)
+}
+
+func TestAuthenticateByUsernameAndPassword_AuthenticationFailure(t *testing.T) {
+	container := test.PrepareForServiceTest()
+
+	service := NewAccountService(container)
+	result, account := service.AuthenticateByUsernameAndPassword("test", "abcde")
+
+	assert.Equal(t, (*model.Account)(nil), account)
+	assert.Equal(t, false, result)
+}
diff --git a/service/category_test.go b/service/category_test.go
new file mode 100644
index 00000000..588314b8
--- /dev/null
+++ b/service/category_test.go
@@ -0,0 +1,17 @@
+package service
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/ybkuroki/go-webapp-sample/test"
+)
+
+func TestFindAllCategories_Success(t *testing.T) {
+	container := test.PrepareForServiceTest()
+
+	service := NewCategoryService(container)
+	result := service.FindAllCategories()
+
+	assert.Equal(t, 3, len(*result))
+}
diff --git a/service/format_test.go b/service/format_test.go
new file mode 100644
index 00000000..f4d4510f
--- /dev/null
+++ b/service/format_test.go
@@ -0,0 +1,17 @@
+package service
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/ybkuroki/go-webapp-sample/test"
+)
+
+func TestFindAllFormats_Success(t *testing.T) {
+	container := test.PrepareForServiceTest()
+
+	service := NewFormatService(container)
+	result := service.FindAllFormats()
+
+	assert.Equal(t, 2, len(*result))
+}