test: refs #8361 enhance exchangeRateUpdate specs with additional scenarios

@@ -27,1 +21,3 @@
-        const maxDateRecord = await models.ReferenceRate.findOne({order: 'dated DESC'});
+        let createdTx = false;
+        if (!myOptions.transaction) {
+            myOptions.transaction = await Self.beginTransaction({});

@@ -36,0 +55,4 @@
+                                    myOptions
+                                );
+                                if (!currency)
+                                    throw new UserError(`Currency not found for code: ${code}`);

@@ -75,1 +98,4 @@
             }
+
+            if (createdTx)
+                await myOptions.transaction.commit();

@@ -36,0 +51,4 @@
+
+                    if (!maxDate || xmlDateWithoutTime > maxDate) {
+                        if (lastProcessedDate && xmlDateWithoutTime > lastProcessedDate) {
+                            for (const code of ['USD', 'CNY', 'GBP']) {