diff --git a/tx/clause_test.go b/tx/clause_test.go
new file mode 100644
index 000000000..534e80025
--- /dev/null
+++ b/tx/clause_test.go
@@ -0,0 +1,66 @@
+package tx
+
+import (
+	"math/big"
+	"reflect"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/vechain/thor/thor"
+)
+
+func TestClauseTo(t *testing.T) {
+	var toAddress thor.Address
+	copy(toAddress[:], []byte{0xde, 0xad, 0xbe, 0xef})
+
+	clause := &Clause{
+		body: clauseBody{
+			To: &toAddress,
+		},
+	}
+
+	result := clause.To()
+
+	// The result should not be nil and should match the mock address
+	assert.NotNil(t, result)
+	assert.Equal(t, toAddress, *result)
+
+	// Test the case where 'To' is nil
+	clause.body.To = nil
+	result = clause.To()
+
+	// The result should be nil
+	assert.Nil(t, result)
+}
+
+func TestClauseValue(t *testing.T) {
+	expectedValue := big.NewInt(100) // Mock value
+
+	clause := &Clause{
+		body: clauseBody{
+			Value: expectedValue,
+		},
+	}
+
+	result := clause.Value()
+
+	// The result should not be nil and should match the mock value
+	assert.NotNil(t, result)
+	assert.Equal(t, 0, expectedValue.Cmp(result))
+}
+
+func TestClauseData(t *testing.T) {
+	expectedData := []byte{0x01, 0x02, 0x03} // Mock data
+
+	clause := &Clause{
+		body: clauseBody{
+			Data: expectedData,
+		},
+	}
+
+	result := clause.Data()
+
+	// The result should not be nil and should match the mock data
+	assert.NotNil(t, result)
+	assert.True(t, reflect.DeepEqual(expectedData, result))
+}
diff --git a/tx/receipt_test.go b/tx/receipt_test.go
index 70bc9059f..c8e703f6c 100644
--- a/tx/receipt_test.go
+++ b/tx/receipt_test.go
@@ -7,11 +7,26 @@ package tx_test
 
 import (
 	"fmt"
+	"math/big"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
+	"github.com/vechain/thor/thor"
 	. "github.com/vechain/thor/tx"
 )
 
+func getMockReceipt() Receipt {
+	receipt := Receipt{
+		GasUsed:  1000,
+		GasPayer: thor.Address{},
+		Paid:     big.NewInt(100),
+		Reward:   big.NewInt(50),
+		Reverted: false,
+		Outputs:  []*Output{},
+	}
+	return receipt
+}
+
 func TestReceipt(t *testing.T) {
 	var rs Receipts
 	fmt.Println(rs.RootHash())
@@ -19,3 +34,30 @@ func TestReceipt(t *testing.T) {
 	var txs Transactions
 	fmt.Println(txs.RootHash())
 }
+
+func TestReceiptStructure(t *testing.T) {
+
+	receipt := getMockReceipt()
+
+	assert.Equal(t, uint64(1000), receipt.GasUsed)
+	assert.Equal(t, thor.Address{}, receipt.GasPayer)
+	assert.Equal(t, big.NewInt(100), receipt.Paid)
+	assert.Equal(t, big.NewInt(50), receipt.Reward)
+	assert.Equal(t, false, receipt.Reverted)
+	assert.Equal(t, []*Output{}, receipt.Outputs)
+
+}
+
+func TestEmptyRootHash(t *testing.T) {
+
+	receipt1 := getMockReceipt()
+	receipt2 := getMockReceipt()
+
+	receipts := Receipts{
+		&receipt1,
+		&receipt2,
+	}
+
+	rootHash := receipts.RootHash()
+	assert.NotEqual(t, thor.Bytes32{}, rootHash, "Root hash should not be empty")
+}
diff --git a/tx/transaction_test.go b/tx/transaction_test.go
index aec96c8df..73c1234e8 100644
--- a/tx/transaction_test.go
+++ b/tx/transaction_test.go
@@ -13,10 +13,166 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/stretchr/testify/assert"
+	"github.com/vechain/thor/metric"
 	"github.com/vechain/thor/thor"
 	"github.com/vechain/thor/tx"
 )
 
+func GetMockTx() tx.Transaction {
+	to, _ := thor.ParseAddress("0x7567d83b7b8d80addcb281a71d54fc7b3364ffed")
+	trx := new(tx.Builder).ChainTag(1).
+		BlockRef(tx.BlockRef{0, 0, 0, 0, 0xaa, 0xbb, 0xcc, 0xdd}).
+		Expiration(32).
+		Clause(tx.NewClause(&to).WithValue(big.NewInt(10000)).WithData([]byte{0, 0, 0, 0x60, 0x60, 0x60})).
+		Clause(tx.NewClause(&to).WithValue(big.NewInt(20000)).WithData([]byte{0, 0, 0, 0x60, 0x60, 0x60})).
+		GasPriceCoef(128).
+		Gas(21000).
+		DependsOn(nil).
+		Nonce(12345678).Build()
+
+	return *trx
+}
+
+func TestIsExpired(t *testing.T) {
+	tx := GetMockTx()
+	res := tx.IsExpired(10)
+	assert.Equal(t, res, false)
+}
+
+func TestHash(t *testing.T) {
+	tx := GetMockTx()
+	res := tx.Hash()
+	assert.Equal(t, res, thor.Bytes32(thor.Bytes32{0x4b, 0xff, 0x70, 0x1, 0xfe, 0xc4, 0x2, 0x84, 0xd9, 0x3b, 0x4c, 0x45, 0x61, 0x7d, 0xc7, 0x41, 0xb9, 0xa8, 0x8e, 0xd5, 0x9d, 0xf, 0x1, 0xa3, 0x76, 0x39, 0x4c, 0x7b, 0xfe, 0xa6, 0xed, 0x24}))
+
+}
+
+func TestDependsOn(t *testing.T) {
+	tx := GetMockTx()
+	res := tx.DependsOn()
+	var expected *thor.Bytes32 = nil
+	assert.Equal(t, expected, res)
+}
+
+func TestTestFeatures(t *testing.T) {
+	txx := GetMockTx()
+	supportedFeatures := tx.Features(1)
+	res := txx.TestFeatures(supportedFeatures)
+	assert.Equal(t, res, nil)
+
+}
+
+func TestToString(t *testing.T) {
+	tx := GetMockTx() // Ensure this mock transaction has all the necessary fields populated
+
+	// Construct the expected string representation of the transaction
+	// This should match the format used in the String() method of the Transaction struct
+	// and should reflect the actual state of the mock transaction
+	expectedString := "\n\tTx(0x0000000000000000000000000000000000000000000000000000000000000000, 87 B)\n\tOrigin:         N/A\n\tClauses:        [\n\t\t(To:\t0x7567d83b7b8d80addcb281a71d54fc7b3364ffed\n\t\t Value:\t10000\n\t\t Data:\t0x000000606060) \n\t\t(To:\t0x7567d83b7b8d80addcb281a71d54fc7b3364ffed\n\t\t Value:\t20000\n\t\t Data:\t0x000000606060)]\n\tGasPriceCoef:   128\n\tGas:            21000\n\tChainTag:       1\n\tBlockRef:       0-aabbccdd\n\tExpiration:     32\n\tDependsOn:      nil\n\tNonce:          12345678\n\tUnprovedWork:   0\n\tDelegator:      N/A\n\tSignature:      0x\n"
+
+	res := tx.String()
+
+	// Use assert.Equal to compare the actual result with the expected string
+	assert.Equal(t, expectedString, res)
+}
+
+func TestTxSize(t *testing.T) {
+
+	tx := GetMockTx()
+
+	size := tx.Size()
+	assert.Equal(t, size, metric.StorageSize(87))
+}
+
+func TestProvedWork(t *testing.T) {
+	// Mock the transaction
+	tx := GetMockTx()
+
+	// Define a head block number
+	headBlockNum := uint32(20)
+
+	// Mock getBlockID function
+	getBlockID := func(num uint32) (thor.Bytes32, error) {
+		return thor.Bytes32{}, nil
+	}
+
+	// Call ProvedWork
+	provedWork, err := tx.ProvedWork(headBlockNum, getBlockID)
+
+	// Check for errors
+	assert.NoError(t, err)
+
+	expectedProvedWork := big.NewInt(0)
+	assert.Equal(t, expectedProvedWork, provedWork)
+}
+
+func TestChainTag(t *testing.T) {
+	tx := GetMockTx()
+	res := tx.ChainTag()
+	assert.Equal(t, res, uint8(0x1))
+}
+
+func TestNonce(t *testing.T) {
+	tx := GetMockTx()
+	res := tx.Nonce()
+	assert.Equal(t, res, uint64(0xbc614e))
+}
+
+func TestOverallGasPrice(t *testing.T) {
+	// Mock or create a Transaction with necessary fields initialized
+	tx := GetMockTx()
+
+	// Define test cases
+	testCases := []struct {
+		name           string
+		baseGasPrice   *big.Int
+		provedWork     *big.Int
+		expectedOutput *big.Int
+	}{
+		{
+			name:           "Case 1: No proved work",
+			baseGasPrice:   big.NewInt(1000),
+			provedWork:     big.NewInt(0),
+			expectedOutput: big.NewInt(1501),
+		},
+		{
+			name:           "Case 1: Negative proved work",
+			baseGasPrice:   big.NewInt(1000),
+			provedWork:     big.NewInt(-100),
+			expectedOutput: big.NewInt(1501),
+		},
+	}
+
+	// Run test cases
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			// Call OverallGasPrice
+			result := tx.OverallGasPrice(tc.baseGasPrice, tc.provedWork)
+
+			// Check the value of the result
+			if result.Cmp(tc.expectedOutput) != 0 {
+				t.Errorf("%s: expected %v, got %v", tc.name, tc.expectedOutput, result)
+			}
+		})
+	}
+}
+
+func TestEvaluateWork(t *testing.T) {
+	origin := thor.BytesToAddress([]byte("origin"))
+	tx := GetMockTx()
+
+	// Returns a function
+	evaluate := tx.EvaluateWork(origin)
+
+	// Test with a range of nonce values
+	for nonce := uint64(0); nonce < 10; nonce++ {
+		work := evaluate(nonce)
+
+		// Basic Assertions
+		assert.NotNil(t, work)
+		assert.True(t, work.Cmp(big.NewInt(0)) > 0, "Work should be positive")
+	}
+}
+
 func TestTx(t *testing.T) {
 	to, _ := thor.ParseAddress("0x7567d83b7b8d80addcb281a71d54fc7b3364ffed")
 	trx := new(tx.Builder).ChainTag(1).
diff --git a/tx/transactions_test.go b/tx/transactions_test.go
new file mode 100644
index 000000000..2b89a7b39
--- /dev/null
+++ b/tx/transactions_test.go
@@ -0,0 +1,28 @@
+package tx_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/vechain/thor/thor"
+	"github.com/vechain/thor/tx"
+)
+
+func MockTransactions(n int) tx.Transactions {
+	txs := make(tx.Transactions, n)
+	for i := range txs {
+		mockTx := GetMockTx()
+		txs[i] = &mockTx
+	}
+	return txs
+}
+
+func TestRootHash(t *testing.T) {
+	// Test empty transactions slice
+	emptyTxs := tx.Transactions{}
+	emptyRoot := emptyTxs.RootHash()
+	assert.Equal(t, emptyTxs.RootHash(), emptyRoot)
+
+	nonEmptyTxs := MockTransactions(2)
+	assert.Equal(t, nonEmptyTxs.RootHash(), thor.Bytes32{0x30, 0x9a, 0xd5, 0x4b, 0x28, 0x76, 0x65, 0x52, 0x66, 0x89, 0x7b, 0x19, 0x22, 0x24, 0x63, 0xd8, 0x27, 0xc8, 0x2a, 0xd6, 0x20, 0x17, 0x7a, 0xcf, 0x9a, 0xfa, 0xc, 0xce, 0xff, 0x12, 0x24, 0x48})
+}
diff --git a/tx/work_eval_test.go b/tx/work_eval_test.go
new file mode 100644
index 000000000..01fef6bb1
--- /dev/null
+++ b/tx/work_eval_test.go
@@ -0,0 +1,51 @@
+package tx
+
+import (
+	"math"
+	"math/big"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestWorkToGas(t *testing.T) {
+	// Test cases
+	testCases := []struct {
+		name     string
+		work     *big.Int
+		blockNum uint32
+		expected uint64
+	}{
+		{
+			name:     "Basic conversion",
+			work:     big.NewInt(10000),
+			blockNum: 100,
+			expected: 10,
+		},
+		{
+			name:     "Zero work",
+			work:     big.NewInt(0),
+			blockNum: 100,
+			expected: 0,
+		},
+		{
+			name:     "Large work value",
+			work:     big.NewInt(math.MaxInt64),
+			blockNum: 100,
+			expected: 0x20c49ba5e353f7,
+		},
+		{
+			name:     "Large work value and blockNum",
+			work:     big.NewInt(math.MaxInt64),
+			blockNum: 12345679,
+			expected: 0x52fc533083329,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			result := workToGas(tc.work, tc.blockNum)
+			assert.Equal(t, tc.expected, result, "Expected and actual gas should match")
+		})
+	}
+}