diff --git a/internal/validation/tuple_rules_wave1_test.go b/internal/validation/tuple_rules_wave1_test.go
new file mode 100644
index 000000000..125bd76fb
--- /dev/null
+++ b/internal/validation/tuple_rules_wave1_test.go
@@ -0,0 +1,29 @@
+package validation_test
+
+import (
+	"testing"
+)
+
+func TestWave1TupleValidationEdgeCases(t *testing.T) {
+	validateEntity := func(entityType, entityID string) bool {
+		if entityType == "" || entityID == "" {
+			return false
+		}
+		if len(entityType) > 64 || len(entityID) > 128 {
+			return false
+		}
+		return true
+	}
+
+	if !validateEntity("user", "usr_100234") {
+		t.Errorf("expected valid entity to pass validation")
+	}
+
+	if validateEntity("", "usr_100234") {
+		t.Errorf("expected empty entity type to fail validation")
+	}
+
+	if validateEntity("user", "") {
+		t.Errorf("expected empty entity ID to fail validation")
+	}
+}