diff --git a/types/mempool/mempool_test.go b/types/mempool/mempool_test.go
index 0e85bc83a..d6f8e8134 100644
--- a/types/mempool/mempool_test.go
+++ b/types/mempool/mempool_test.go
@@ -93,6 +93,17 @@ func (_ sigErrTx) GetPubKeys() ([]cryptotypes.PubKey, error) { return nil, nil }
 
 func (t sigErrTx) GetSignaturesV2() ([]txsigning.SignatureV2, error) { return t.getSigs() }
 
+type txSpec struct {
+	i int
+	p int
+	n int
+	a sdk.AccAddress
+}
+
+func (tx txSpec) String() string {
+	return fmt.Sprintf("[tx i: %d, a: %s, p: %d, n: %d]", tx.i, tx.a, tx.p, tx.n)
+}
+
 func (s *MempoolTestSuite) TestDefaultMempool() {
 	t := s.T()
 	ctx := sdk.NewContext(nil, tmproto.Header{}, false, log.NewNopLogger())
@@ -157,213 +168,6 @@ func (s *MempoolTestSuite) TestDefaultMempool() {
 	require.Equal(t, 1, s.mempool.CountTx())
 }
 
-type txSpec struct {
-	i int
-	p int
-	n int
-	a sdk.AccAddress
-}
-
-func (tx txSpec) String() string {
-	return fmt.Sprintf("[tx i: %d, a: %s, p: %d, n: %d]", tx.i, tx.a, tx.p, tx.n)
-}
-
-func (s *MempoolTestSuite) TestTxOrder() {
-	t := s.T()
-	ctx := sdk.NewContext(nil, tmproto.Header{}, false, log.NewNopLogger())
-	accounts := simtypes.RandomAccounts(rand.New(rand.NewSource(0)), 5)
-	sa := accounts[0].Address
-	sb := accounts[1].Address
-	sc := accounts[2].Address
-
-	tests := []struct {
-		txs   []txSpec
-		order []int
-		fail  bool
-	}{
-		{
-			txs: []txSpec{
-				{p: 21, n: 4, a: sa},
-				{p: 8, n: 3, a: sa},
-				{p: 6, n: 2, a: sa},
-				{p: 15, n: 1, a: sb},
-				{p: 20, n: 1, a: sa},
-			},
-			order: []int{3, 4, 2, 1, 0},
-		},
-		{
-			txs: []txSpec{
-				{p: 3, n: 0, a: sa},
-				{p: 5, n: 1, a: sa},
-				{p: 9, n: 2, a: sa},
-				{p: 6, n: 0, a: sb},
-				{p: 5, n: 1, a: sb},
-				{p: 8, n: 2, a: sb},
-			},
-			order: []int{3, 0, 4, 1, 5, 2},
-		},
-		{
-			txs: []txSpec{
-				{p: 21, n: 4, a: sa},
-				{p: 15, n: 1, a: sb},
-				{p: 20, n: 1, a: sa},
-			},
-			order: []int{1, 2, 0},
-		},
-		{
-			txs: []txSpec{
-				{p: 50, n: 3, a: sa},
-				{p: 30, n: 2, a: sa},
-				{p: 10, n: 1, a: sa},
-				{p: 15, n: 1, a: sb},
-				{p: 21, n: 2, a: sb},
-			},
-			order: []int{3, 2, 4, 1, 0},
-		},
-		{
-			txs: []txSpec{
-				{p: 50, n: 3, a: sa},
-				{p: 10, n: 2, a: sa},
-				{p: 99, n: 1, a: sa},
-				{p: 15, n: 1, a: sb},
-				{p: 8, n: 2, a: sb},
-			},
-			order: []int{3, 2, 4, 1, 0},
-		},
-		{
-			txs: []txSpec{
-				{p: 30, a: sa, n: 2},
-				{p: 20, a: sb, n: 1},
-				{p: 15, a: sa, n: 1},
-				{p: 10, a: sa, n: 0},
-				{p: 8, a: sb, n: 0},
-				{p: 6, a: sa, n: 3},
-				{p: 4, a: sb, n: 3},
-			},
-			order: []int{4, 3, 1, 2, 0, 6, 5},
-		},
-		{
-			txs: []txSpec{
-				{p: 30, n: 2, a: sa},
-				{p: 20, a: sb, n: 1},
-				{p: 15, a: sa, n: 1},
-				{p: 10, a: sa, n: 0},
-				{p: 8, a: sb, n: 0},
-				{p: 6, a: sa, n: 3},
-				{p: 4, a: sb, n: 3},
-				{p: 2, a: sc, n: 0},
-				{p: 7, a: sc, n: 3},
-			},
-			order: []int{4, 3, 7, 1, 2, 0, 6, 5, 8},
-		},
-		{
-			txs: []txSpec{
-				{p: 6, n: 1, a: sa},
-				{p: 10, n: 2, a: sa},
-				{p: 5, n: 1, a: sb},
-				{p: 99, n: 2, a: sb},
-			},
-			order: []int{2, 0, 3, 1},
-		},
-		{
-			// if all txs have the same priority they will be ordered lexically sender address, and nonce with the
-			// sender.
-			txs: []txSpec{
-				{p: 10, n: 7, a: sc},
-				{p: 10, n: 8, a: sc},
-				{p: 10, n: 9, a: sc},
-				{p: 10, n: 1, a: sa},
-				{p: 10, n: 2, a: sa},
-				{p: 10, n: 3, a: sa},
-				{p: 10, n: 4, a: sb},
-				{p: 10, n: 5, a: sb},
-				{p: 10, n: 6, a: sb},
-			},
-			order: []int{3, 4, 5, 6, 7, 8, 0, 1, 2},
-		},
-		/*
-			The next 4 tests are different permutations of the same set:
-
-			  		{p: 5, n: 1, a: sa},
-					{p: 10, n: 2, a: sa},
-					{p: 20, n: 2, a: sb},
-					{p: 5, n: 1, a: sb},
-					{p: 99, n: 2, a: sc},
-					{p: 5, n: 1, a: sc},
-
-			which exercises the actions required to resolve priority ties.
-		*/
-		{
-			txs: []txSpec{
-				{p: 5, n: 1, a: sa},
-				{p: 10, n: 2, a: sa},
-				{p: 5, n: 1, a: sb},
-				{p: 99, n: 2, a: sb},
-			},
-			order: []int{2, 0, 3, 1},
-		},
-		{
-			txs: []txSpec{
-				{p: 5, n: 1, a: sa},
-				{p: 10, n: 2, a: sa},
-				{p: 20, n: 2, a: sb},
-				{p: 5, n: 1, a: sb},
-				{p: 99, n: 2, a: sc},
-				{p: 5, n: 1, a: sc},
-			},
-			order: []int{3, 0, 5, 2, 1, 4},
-		},
-		{
-			txs: []txSpec{
-				{p: 5, n: 1, a: sa},
-				{p: 10, n: 2, a: sa},
-				{p: 5, n: 1, a: sb},
-				{p: 20, n: 2, a: sb},
-				{p: 5, n: 1, a: sc},
-				{p: 99, n: 2, a: sc},
-			},
-			order: []int{2, 0, 4, 3, 1, 5},
-		},
-		{
-			txs: []txSpec{
-				{p: 5, n: 1, a: sa},
-				{p: 10, n: 2, a: sa},
-				{p: 5, n: 1, a: sc},
-				{p: 20, n: 2, a: sc},
-				{p: 5, n: 1, a: sb},
-				{p: 99, n: 2, a: sb},
-			},
-			order: []int{4, 0, 2, 5, 1, 3},
-		},
-	}
-	for i, tt := range tests {
-		t.Run(fmt.Sprintf("case %d", i), func(t *testing.T) {
-			pool := s.mempool
-
-			// create test txs and insert into mempool
-			for i, ts := range tt.txs {
-				tx := testTx{id: i, priority: int64(ts.p), nonce: uint64(ts.n), address: ts.a}
-				c := ctx.WithPriority(tx.priority)
-				err := pool.Insert(c, tx)
-				require.NoError(t, err)
-			}
-
-			orderedTxs, err := pool.Select(nil, 1000)
-			require.NoError(t, err)
-			var txOrder []int
-			for _, tx := range orderedTxs {
-				txOrder = append(txOrder, tx.(testTx).id)
-			}
-			for _, tx := range orderedTxs {
-				require.NoError(t, pool.Remove(tx))
-			}
-
-			require.Equal(t, tt.order, txOrder)
-			require.Equal(t, 0, pool.CountTx())
-		})
-	}
-}
-
 type MempoolTestSuite struct {
 	suite.Suite
 	numTxs      int
diff --git a/types/mempool/nonce_test.go b/types/mempool/nonce_test.go
new file mode 100644
index 000000000..e152ce099
--- /dev/null
+++ b/types/mempool/nonce_test.go
@@ -0,0 +1,210 @@
+package mempool_test
+
+import (
+	"fmt"
+	"math/rand"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"github.com/tendermint/tendermint/libs/log"
+	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	simtypes "github.com/cosmos/cosmos-sdk/types/simulation"
+)
+
+func (s *MempoolTestSuite) TestTxOrder() {
+	t := s.T()
+	ctx := sdk.NewContext(nil, tmproto.Header{}, false, log.NewNopLogger())
+	accounts := simtypes.RandomAccounts(rand.New(rand.NewSource(0)), 5)
+	sa := accounts[0].Address
+	sb := accounts[1].Address
+	sc := accounts[2].Address
+
+	tests := []struct {
+		txs   []txSpec
+		order []int
+		fail  bool
+	}{
+		{
+			txs: []txSpec{
+				{p: 21, n: 4, a: sa},
+				{p: 8, n: 3, a: sa},
+				{p: 6, n: 2, a: sa},
+				{p: 15, n: 1, a: sb},
+				{p: 20, n: 1, a: sa},
+			},
+			order: []int{3, 4, 2, 1, 0},
+		},
+		{
+			txs: []txSpec{
+				{p: 3, n: 0, a: sa},
+				{p: 5, n: 1, a: sa},
+				{p: 9, n: 2, a: sa},
+				{p: 6, n: 0, a: sb},
+				{p: 5, n: 1, a: sb},
+				{p: 8, n: 2, a: sb},
+			},
+			order: []int{3, 0, 4, 1, 5, 2},
+		},
+		{
+			txs: []txSpec{
+				{p: 21, n: 4, a: sa},
+				{p: 15, n: 1, a: sb},
+				{p: 20, n: 1, a: sa},
+			},
+			order: []int{1, 2, 0},
+		},
+		{
+			txs: []txSpec{
+				{p: 50, n: 3, a: sa},
+				{p: 30, n: 2, a: sa},
+				{p: 10, n: 1, a: sa},
+				{p: 15, n: 1, a: sb},
+				{p: 21, n: 2, a: sb},
+			},
+			order: []int{3, 2, 4, 1, 0},
+		},
+		{
+			txs: []txSpec{
+				{p: 50, n: 3, a: sa},
+				{p: 10, n: 2, a: sa},
+				{p: 99, n: 1, a: sa},
+				{p: 15, n: 1, a: sb},
+				{p: 8, n: 2, a: sb},
+			},
+			order: []int{3, 2, 4, 1, 0},
+		},
+		{
+			txs: []txSpec{
+				{p: 30, a: sa, n: 2},
+				{p: 20, a: sb, n: 1},
+				{p: 15, a: sa, n: 1},
+				{p: 10, a: sa, n: 0},
+				{p: 8, a: sb, n: 0},
+				{p: 6, a: sa, n: 3},
+				{p: 4, a: sb, n: 3},
+			},
+			order: []int{4, 3, 1, 2, 0, 6, 5},
+		},
+		{
+			txs: []txSpec{
+				{p: 30, n: 2, a: sa},
+				{p: 20, a: sb, n: 1},
+				{p: 15, a: sa, n: 1},
+				{p: 10, a: sa, n: 0},
+				{p: 8, a: sb, n: 0},
+				{p: 6, a: sa, n: 3},
+				{p: 4, a: sb, n: 3},
+				{p: 2, a: sc, n: 0},
+				{p: 7, a: sc, n: 3},
+			},
+			order: []int{4, 3, 7, 1, 2, 0, 6, 5, 8},
+		},
+		{
+			txs: []txSpec{
+				{p: 6, n: 1, a: sa},
+				{p: 10, n: 2, a: sa},
+				{p: 5, n: 1, a: sb},
+				{p: 99, n: 2, a: sb},
+			},
+			order: []int{2, 0, 3, 1},
+		},
+		{
+			// if all txs have the same priority they will be ordered lexically sender address, and nonce with the
+			// sender.
+			txs: []txSpec{
+				{p: 10, n: 7, a: sc},
+				{p: 10, n: 8, a: sc},
+				{p: 10, n: 9, a: sc},
+				{p: 10, n: 1, a: sa},
+				{p: 10, n: 2, a: sa},
+				{p: 10, n: 3, a: sa},
+				{p: 10, n: 4, a: sb},
+				{p: 10, n: 5, a: sb},
+				{p: 10, n: 6, a: sb},
+			},
+			order: []int{3, 4, 5, 6, 7, 8, 0, 1, 2},
+		},
+		/*
+			The next 4 tests are different permutations of the same set:
+
+			  		{p: 5, n: 1, a: sa},
+					{p: 10, n: 2, a: sa},
+					{p: 20, n: 2, a: sb},
+					{p: 5, n: 1, a: sb},
+					{p: 99, n: 2, a: sc},
+					{p: 5, n: 1, a: sc},
+
+			which exercises the actions required to resolve priority ties.
+		*/
+		{
+			txs: []txSpec{
+				{p: 5, n: 1, a: sa},
+				{p: 10, n: 2, a: sa},
+				{p: 5, n: 1, a: sb},
+				{p: 99, n: 2, a: sb},
+			},
+			order: []int{2, 0, 3, 1},
+		},
+		{
+			txs: []txSpec{
+				{p: 5, n: 1, a: sa},
+				{p: 10, n: 2, a: sa},
+				{p: 20, n: 2, a: sb},
+				{p: 5, n: 1, a: sb},
+				{p: 99, n: 2, a: sc},
+				{p: 5, n: 1, a: sc},
+			},
+			order: []int{3, 0, 5, 2, 1, 4},
+		},
+		{
+			txs: []txSpec{
+				{p: 5, n: 1, a: sa},
+				{p: 10, n: 2, a: sa},
+				{p: 5, n: 1, a: sb},
+				{p: 20, n: 2, a: sb},
+				{p: 5, n: 1, a: sc},
+				{p: 99, n: 2, a: sc},
+			},
+			order: []int{2, 0, 4, 3, 1, 5},
+		},
+		{
+			txs: []txSpec{
+				{p: 5, n: 1, a: sa},
+				{p: 10, n: 2, a: sa},
+				{p: 5, n: 1, a: sc},
+				{p: 20, n: 2, a: sc},
+				{p: 5, n: 1, a: sb},
+				{p: 99, n: 2, a: sb},
+			},
+			order: []int{4, 0, 2, 5, 1, 3},
+		},
+	}
+	for i, tt := range tests {
+		t.Run(fmt.Sprintf("case %d", i), func(t *testing.T) {
+			pool := s.mempool
+
+			// create test txs and insert into mempool
+			for i, ts := range tt.txs {
+				tx := testTx{id: i, priority: int64(ts.p), nonce: uint64(ts.n), address: ts.a}
+				c := ctx.WithPriority(tx.priority)
+				err := pool.Insert(c, tx)
+				require.NoError(t, err)
+			}
+
+			orderedTxs, err := pool.Select(nil, 1000)
+			require.NoError(t, err)
+			var txOrder []int
+			for _, tx := range orderedTxs {
+				txOrder = append(txOrder, tx.(testTx).id)
+			}
+			for _, tx := range orderedTxs {
+				require.NoError(t, pool.Remove(tx))
+			}
+
+			require.Equal(t, tt.order, txOrder)
+			require.Equal(t, 0, pool.CountTx())
+		})
+	}
+}