Add position for book in collection

internal/apitest/get_collection_test.go

@@ -13,14 +13,14 @@ func TestGetCollection_Ok(t *testing.T) {
 	status, collection := testGetCollection(t, "1", "10", "0")
 	assert.Equal(t, http.StatusOK, status)
 	assert.Equal(t, "Littérature française", collection.Name)
-	assert.Equal(t, 6, len(collection.Books))
+	assert.Equal(t, 6, len(collection.Items))
 }
 
 func TestGetCollection_Limit(t *testing.T) {
 	status, collection := testGetCollection(t, "2", "3", "0")
 	assert.Equal(t, http.StatusOK, status)
 	assert.Equal(t, "Nouvelles", collection.Name)
-	assert.Equal(t, 3, len(collection.Books))
+	assert.Equal(t, 3, len(collection.Items))
 	assert.Equal(t, int64(4), collection.Count)
 }
 
@@ -33,10 +33,17 @@ func TestGetCollection_Empty(t *testing.T) {
 	status, collection := testGetCollection(t, "4", "10", "0")
 	assert.Equal(t, http.StatusOK, status)
 	assert.Equal(t, "Empty", collection.Name)
-	assert.Equal(t, 0, len(collection.Books))
+	assert.Equal(t, 0, len(collection.Items))
 	assert.Equal(t, int64(0), collection.Count)
 }
 
+func TestGetCollection_Position(t *testing.T) {
+	status, collection := testGetCollection(t, "2", "3", "0")
+	assert.Equal(t, http.StatusOK, status)
+	assert.Equal(t, "Nouvelles", collection.Name)
+	assert.Equal(t, uint(3), collection.Items[2].Position)
+}
+
 func testGetCollection(t *testing.T, id string, limit string, offset string) (int, dto.CollectionGet) {
 	return testutils.TestFetchModel[dto.CollectionGet](t, "/ws/collection/"+id, limit, offset)
 }