Added a test for persistence

Collection_test.go

@@ -11,7 +11,7 @@ type User struct {
 	Name string `json:"name"`
 }
 
-func TestCollectionGet(t *testing.T) {
+func TestGet(t *testing.T) {
 	users, err := ocean.New[User]("test")
 	assert.Nil(t, err)
 	defer users.Clear()
@@ -23,6 +23,22 @@ func TestCollectionGet(t *testing.T) {
 	assert.NotNil(t, user)
 }
 
+func TestCollectionAll(t *testing.T) {
+	users, err := ocean.New[User]("test")
+	assert.Nil(t, err)
+	defer users.Clear()
+
+	users.Set("1", &User{Name: "User 1"})
+	users.Set("2", &User{Name: "User 2"})
+	count := 0
+
+	for range users.All() {
+		count++
+	}
+
+	assert.Equal(t, count, 2)
+}
+
 func TestInteraction(t *testing.T) {
 	users, err := ocean.New[User]("test")
 	assert.Nil(t, err)
@@ -52,18 +68,23 @@ func TestInteraction(t *testing.T) {
 	assert.True(t, !users.Exists("2"))
 }
 
-func TestCollectionAll(t *testing.T) {
+func TestPersistence(t *testing.T) {
 	users, err := ocean.New[User]("test")
 	assert.Nil(t, err)
 	defer users.Clear()
 
 	users.Set("1", &User{Name: "User 1"})
 	users.Set("2", &User{Name: "User 2"})
-	count := 0
 
-	for range users.All() {
-		count++
-	}
+	again, err := ocean.New[User]("test")
+	assert.Nil(t, err)
 
-	assert.Equal(t, count, 2)
+	user1, err := again.Get("1")
+	assert.Nil(t, err)
+
+	user2, err := again.Get("2")
+	assert.Nil(t, err)
+
+	assert.NotNil(t, user1)
+	assert.NotNil(t, user2)
 }