Fix txpool unit tests (0xPolygon#1429)

* Enable all forks at genesis and add unit test which checks that dynamic fee tx gets rejected if london hardfork is not enabled

* Minor change

* Fix

txpool/txpool_test.go

@@ -34,6 +34,7 @@ var (
 	forks = &chain.Forks{
 		Homestead: chain.NewFork(0),
 		Istanbul:  chain.NewFork(0),
+		London:    chain.NewFork(0),
 	}
 )
 
@@ -1835,6 +1836,22 @@ func TestPermissionSmartContractDeployment(t *testing.T) {
 			ErrTipAboveFeeCap,
 		)
 	})
+
+	t.Run("dynamic fee tx placed without eip-1559 fork enabled", func(t *testing.T) {
+		t.Parallel()
+		pool := setupPool()
+		pool.forks.London = false
+
+		tx := newTx(defaultAddr, 0, 1)
+		tx.Type = types.DynamicFeeTx
+		tx.GasFeeCap = big.NewInt(10000)
+		tx.GasTipCap = big.NewInt(100000)
+
+		assert.ErrorIs(t,
+			pool.addTx(local, signTx(tx)),
+			ErrInvalidTxType,
+		)
+	})
 }
 
 /* "Integrated" tests */