2 files changed, 90 insertions, 0 deletions
diff --git a/app/db/in_memory_repository.go b/app/db/in_memory_repository.go
new file mode 100644
index 0000000..5b84dbf
--- /dev/null
+++ b/app/db/in_memory_repository.go
@@ -0,0 +1,40 @@
+package db
+
+import (
+	"github.com/xlgmokha/x/pkg/x"
+	"gitlab.com/gitlab-org/software-supply-chain-security/authorization/sparkled/app/domain"
+	"gitlab.com/gitlab-org/software-supply-chain-security/authorization/sparkled/pkg/pls"
+)
+
+type inMemoryRepository[T domain.Entity] struct {
+	items []T
+}
+
+func NewRepository[T domain.Entity]() domain.Repository[T] {
+	return &inMemoryRepository[T]{
+		items: []T{},
+	}
+}
+
+func (r *inMemoryRepository[T]) All() []T {
+	return r.items
+}
+
+func (r *inMemoryRepository[T]) Find(id domain.ID) T {
+	return x.Find(r.All(), func(item T) bool {
+		return item.GetID() == id
+	})
+}
+
+func (r *inMemoryRepository[T]) Save(item T) error {
+	if err := item.Validate(); err != nil {
+		return err
+	}
+
+	if item.GetID() == "" {
+		item.SetID(domain.ID(pls.GenerateULID()))
+	}
+
+	r.items = append(r.items, item)
+	return nil
+}
diff --git a/app/db/in_memory_repository_test.go b/app/db/in_memory_repository_test.go
new file mode 100644
index 0000000..bd9d12f
--- /dev/null
+++ b/app/db/in_memory_repository_test.go
@@ -0,0 +1,50 @@
+package db
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"gitlab.com/gitlab-org/software-supply-chain-security/authorization/sparkled/app/domain"
+)
+
+func TestInMemoryRepository(t *testing.T) {
+	storage := NewRepository[*domain.Sparkle]()
+
+	t.Run("Save", func(t *testing.T) {
+		t.Run("an invalid Sparkle", func(t *testing.T) {
+			err := storage.Save(&domain.Sparkle{Reason: "because"})
+
+			assert.Error(t, err)
+			assert.Equal(t, 0, len(storage.All()))
+		})
+
+		t.Run("a valid Sparkle", func(t *testing.T) {
+			sparkle := &domain.Sparkle{Sparklee: "@tanuki", Reason: "because"}
+			require.NoError(t, storage.Save(sparkle))
+
+			sparkles := storage.All()
+			assert.Equal(t, 1, len(sparkles))
+			assert.NotEmpty(t, sparkles[0].ID)
+			assert.Equal(t, "@tanuki", sparkles[0].Sparklee)
+			assert.Equal(t, "because", sparkles[0].Reason)
+		})
+	})
+
+	t.Run("Find", func(t *testing.T) {
+		t.Run("when the entity exists", func(t *testing.T) {
+			sparkle, err := domain.NewSparkle("@tanuki for testing this func")
+			require.NoError(t, err)
+			require.NoError(t, storage.Save(sparkle))
+
+			result := storage.Find(sparkle.ID)
+			require.NotNil(t, result)
+			require.Equal(t, sparkle, result)
+		})
+
+		t.Run("when the entity does not exist", func(t *testing.T) {
+			result := storage.Find("unknown")
+			require.Nil(t, result)
+		})
+	})
+}