chore: establish local platform baseline

internal/pagination/cursor_test.go

@@ -0,0 +1,36 @@
+package pagination
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestCursorRoundTripAndTamperProtection(t *testing.T) {
+	codec, err := NewCodec([]byte("01234567890123456789012345678901"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	encoded, err := codec.Encode("2026-08-23T12:00:00Z", "item-1")
+	if err != nil {
+		t.Fatal(err)
+	}
+	decoded, err := codec.Decode(encoded)
+	if err != nil || decoded.ID != "item-1" {
+		t.Fatalf("decoded = %#v, err = %v", decoded, err)
+	}
+	tampered := encoded[:len(encoded)-1] + "A"
+	if _, err := codec.Decode(tampered); !errors.Is(err, ErrInvalidCursor) {
+		t.Fatalf("tampered cursor error = %v", err)
+	}
+}
+
+func TestParseLimit(t *testing.T) {
+	if value, err := ParseLimit(""); err != nil || value != DefaultLimit {
+		t.Fatalf("default limit = %d, err = %v", value, err)
+	}
+	for _, invalid := range []string{"0", "101", "abc", "-1"} {
+		if _, err := ParseLimit(invalid); err == nil {
+			t.Fatalf("expected %q to be rejected", invalid)
+		}
+	}
+}