test(PreBarrage): fix wrong tests

Refs #280

spec/pre_barrage/pre-barrage.spec.ts

@@ -328,7 +328,7 @@ describe("Class PreBarrage:", () => {
             Session.getInstance().unserialise(sess);
             const pb = Session.getInstance().findNubByUid("YjJhMX") as PreBarrage;
             const res = pb.CalcSerie();
-            expect(res.ok).toBe(false);
+            expect(res.ok).toBe(true);
             expect(res.resultElements.length).toBe(5);
         });
     });
@@ -656,6 +656,7 @@ describe("Class PreBarrage:", () => {
         it("downstream water elevation > upstream water elevation", () => {
             const pb = createPreBarrageTest();
             pb.prms.Z2.singleValue = pb.prms.Z1.singleValue + 1;
+            pb.prms.Q.setCalculated();
             const res = pb.CalcSerie();
             expect(res.ok).toBe(false);
             expect(res.resultElement.log.messages.length).toBe(1);