test: see merge request nghyd!177 1st comment

refs nghyd#571
refs #329

spec/value_ref/value_ref_deleted_module.spec.ts

+import { PabChute, PabChuteParams, ParamValueMode, Props, Session } from "../../src/index";
+
+describe("référence à un nub supprimé par la suite : ", () => {
+    it("test 1", () => {
+        // cas de figure : cf. merge request 177 (nghyd#571,jalhyd#329)
+
+        const session = Session.getInstance();
+        //        const pc1: PabChute = new PabChute(new PabChuteParams(2, 0.5, 666));
+        const props = new Props({ calcType: 12, nullParams: false });
+        const pc1: PabChute = <PabChute>session.createSessionNub(props);
+
+        let serialisedNub: string = pc1.serialise({ title: "newcalc" });
+        const pc2 = session.unserialiseSingleNub(serialisedNub).nub;
+
+        const DH_2 = pc2.getParameter("DH");
+        DH_2.defineReference(pc1, "DH");
+        session.deleteNub(pc1);
+
+        expect(DH_2.valueMode).toBe(ParamValueMode.SINGLE); // pas de but du test, mais ça mange pas de pain
+        DH_2.setCalculated();
+
+        serialisedNub = pc2.serialise({ title: "newcalc2" });
+        session.unserialiseSingleNub(serialisedNub).nub;
+
+        expect(DH_2.valueMode).toBe(ParamValueMode.CALCUL);
+    });
+});