hybrid pagination

pkg/response/pagination_test.go

@@ -0,0 +1,47 @@
+package response
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/labstack/echo/v4"
+)
+
+func TestNewPaginationDefaults(t *testing.T) {
+	e := echo.New()
+	req := httptest.NewRequest(http.MethodGet, "/?limit=10&offset=0&sort_by=created_at&sort_order=desc", nil)
+	rec := httptest.NewRecorder()
+	c := e.NewContext(req, rec)
+
+	p, err := NewPagination(c)
+	if err != nil {
+		t.Fatalf("NewPagination: %v", err)
+	}
+	if p.Limit != 10 || p.Offset != 0 || p.Cursor != "" {
+		t.Fatalf("unexpected pagination: %+v", p)
+	}
+}
+
+func TestNewPaginationCursorConflict(t *testing.T) {
+	e := echo.New()
+	req := httptest.NewRequest(http.MethodGet, "/?limit=10&offset=5&cursor=abc", nil)
+	rec := httptest.NewRecorder()
+	c := e.NewContext(req, rec)
+
+	_, err := NewPagination(c)
+	if !IsPaginationError(err) {
+		t.Fatalf("expected pagination conflict, got %v", err)
+	}
+}
+
+func TestListMetaOmitsNextCursorOnLastPage(t *testing.T) {
+	p := &Pagination{Limit: 10, Offset: 0}
+	meta := p.ListMeta(15, "should-not-appear", false, 0)
+	if meta.HasMore || meta.NextCursor != "" {
+		t.Fatalf("expected no next cursor on last page: %+v", meta)
+	}
+	if meta.Page != 1 || meta.Pages != 2 || meta.Total != 15 {
+		t.Fatalf("unexpected page meta: %+v", meta)
+	}
+}