added tests for CanonicalTransactionChain getters

packages/contracts/test/contracts/L1/rollup/CanonicalTransactionChain.spec.ts

@@ -679,6 +679,16 @@ describe('CanonicalTransactionChain', () => {
             }
           )
           await res.wait()
+
+          expect(await CanonicalTransactionChain.getLastTimestamp()).to.equal(
+            timestamp
+          )
+          expect(await CanonicalTransactionChain.getLastBlockNumber()).to.equal(
+            blockNumber
+          )
+          expect(
+            await CanonicalTransactionChain.getNumPendingQueueElements()
+          ).to.equal(0)
         })
 
         it(`should return ${size}`, async () => {
@@ -686,7 +696,17 @@ describe('CanonicalTransactionChain', () => {
             size
           )
         })
+
+        it('should return zero after queue is emptied', async () => {
+          expect(await CanonicalTransactionChain.getNextQueueIndex()).to.equal(
+            0
+          )
+        })
       })
     }
+
+    it('should return zero', async () => {
+      expect(await CanonicalTransactionChain.getTotalBatches()).to.equal(0)
+    })
   })
 })