diff --git a/internal/tezos/send_transaction_test.go b/internal/tezos/send_transaction_test.go
new file mode 100644
index 0000000..26031af
--- /dev/null
+++ b/internal/tezos/send_transaction_test.go
@@ -0,0 +1,151 @@
+package tezos
+
+import (
+	"encoding/json"
+	"errors"
+	"testing"
+
+	"blockwatch.cc/tzgo/rpc"
+	"blockwatch.cc/tzgo/tezos"
+	"github.com/hyperledger/firefly-transaction-manager/pkg/ffcapi"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
+)
+
+func TestTransactionSendDecodeStrError(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	req := &ffcapi.TransactionSendRequest{
+		TransactionData: "1",
+	}
+	res, reason, err := c.TransactionSend(ctx, req)
+	assert.Error(t, err)
+	assert.Equal(t, reason, ffcapi.ErrorReasonInvalidInputs)
+	assert.Nil(t, res)
+}
+
+func TestTransactionSendDecodeOpError(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	req := &ffcapi.TransactionSendRequest{}
+	res, reason, err := c.TransactionSend(ctx, req)
+	assert.Error(t, err)
+	assert.Equal(t, reason, ffcapi.ErrorReasonInvalidInputs)
+	assert.Nil(t, res)
+}
+
+func TestTransactionSendWrongFromAddressError(t *testing.T) {
+	ctx, c, _, done := newTestConnector(t)
+	defer done()
+
+	req := &ffcapi.TransactionSendRequest{
+		TransactionHeaders: ffcapi.TransactionHeaders{
+			From: "wrong",
+		},
+		TransactionData: "424d426559724d4a704c577271437337555463466155514365574271736a434c6c00889816a17ae688c971be1ad34bfe1990f8fa5e0f000b0000000130a980e6e41028da2cacfca4ddefea252d18bed900ffff05706175736500000002030a",
+	}
+	res, _, err := c.TransactionSend(ctx, req)
+	assert.Error(t, err)
+	assert.Regexp(t, "FF23019", err)
+	assert.Nil(t, res)
+}
+
+func TestTransactionSendGetContractExtError(t *testing.T) {
+	ctx, c, mRPC, done := newTestConnector(t)
+	defer done()
+
+	mRPC.On("GetBlockHash", ctx, mock.Anything).
+		Return(tezos.NewBlockHash([]byte("BMBeYrMJpLWrqCs7UTcFaUQCeWBqsjCLejX5D8zE8m9syHqHnZg")), nil)
+
+	mRPC.On("GetContractExt", ctx, mock.Anything, mock.Anything).
+		Return(nil, errors.New("error"))
+
+	req := &ffcapi.TransactionSendRequest{
+		TransactionHeaders: ffcapi.TransactionHeaders{
+			From: "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN",
+			To:   "KT1D254HTPKq5GZNVcF73XBinG9BLybHqu8s",
+		},
+		TransactionData: "424d426559724d4a704c577271437337555463466155514365574271736a434c6c00889816a17ae688c971be1ad34bfe1990f8fa5e0f000b0000000130a980e6e41028da2cacfca4ddefea252d18bed900ffff05706175736500000002030a",
+	}
+	_, _, err := c.TransactionSend(ctx, req)
+	assert.Error(t, err)
+}
+
+func TestTransactionSendSimulateError(t *testing.T) {
+	ctx, c, mRPC, done := newTestConnector(t)
+	defer done()
+
+	mRPC.On("GetBlockHash", ctx, mock.Anything).
+		Return(tezos.NewBlockHash([]byte("BMBeYrMJpLWrqCs7UTcFaUQCeWBqsjCLejX5D8zE8m9syHqHnZg")), nil)
+
+	mRPC.On("GetContractExt", ctx, mock.Anything, mock.Anything).
+		Return(&rpc.ContractInfo{
+			Counter: 10,
+			Manager: "edpkv89Jj4aVWetK69CWm5ss1LayvK8dQoiFz7p995y1k3E8CZwqJ6",
+		}, nil)
+
+	mRPC.On("Simulate", ctx, mock.Anything, mock.Anything).Return(nil, errors.New("error"))
+
+	req := &ffcapi.TransactionSendRequest{
+		TransactionHeaders: ffcapi.TransactionHeaders{
+			From: "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN",
+			To:   "KT1D254HTPKq5GZNVcF73XBinG9BLybHqu8s",
+		},
+		TransactionData: "424d426559724d4a704c577271437337555463466155514365574271736a434c6c00889816a17ae688c971be1ad34bfe1990f8fa5e0f000b0000000130a980e6e41028da2cacfca4ddefea252d18bed900ffff05706175736500000002030a",
+	}
+	_, _, err := c.TransactionSend(ctx, req)
+	assert.Error(t, err)
+}
+
+func TestTransactionSendWrongSimulateStatusError(t *testing.T) {
+	ctx, c, mRPC, done := newTestConnector(t)
+	defer done()
+
+	mRPC.On("GetBlockHash", ctx, mock.Anything).
+		Return(tezos.NewBlockHash([]byte("BMBeYrMJpLWrqCs7UTcFaUQCeWBqsjCLejX5D8zE8m9syHqHnZg")), nil)
+
+	mRPC.On("GetContractExt", ctx, mock.Anything, mock.Anything).
+		Return(&rpc.ContractInfo{
+			Counter: 10,
+			Manager: "edpkv89Jj4aVWetK69CWm5ss1LayvK8dQoiFz7p995y1k3E8CZwqJ6",
+		}, nil)
+
+	mRPC.On("Simulate", ctx, mock.Anything, mock.Anything).
+		Return(&rpc.Receipt{
+			Op: &rpc.Operation{
+				Contents: []rpc.TypedOperation{
+					rpc.Transaction{
+						Manager: rpc.Manager{
+							Generic: rpc.Generic{
+								Metadata: rpc.OperationMetadata{
+									Result: rpc.OperationResult{
+										Errors: []rpc.OperationError{
+											{
+												GenericError: rpc.GenericError{
+													ID:   "error id",
+													Kind: "error",
+												},
+												Raw: json.RawMessage{},
+											},
+										},
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		}, nil)
+
+	req := &ffcapi.TransactionSendRequest{
+		TransactionHeaders: ffcapi.TransactionHeaders{
+			From: "tz1Y6GnVhC4EpcDDSmD3ibcC4WX6DJ4Q1QLN",
+			To:   "KT1D254HTPKq5GZNVcF73XBinG9BLybHqu8s",
+		},
+		TransactionData: "424d426559724d4a704c577271437337555463466155514365574271736a434c6c00889816a17ae688c971be1ad34bfe1990f8fa5e0f000b0000000130a980e6e41028da2cacfca4ddefea252d18bed900ffff05706175736500000002030a",
+	}
+	_, _, err := c.TransactionSend(ctx, req)
+	assert.Error(t, err)
+}