diff --git a/pkg/util/array_test.go b/pkg/util/array_test.go
index 13ab01330..da0ef9448 100644
--- a/pkg/util/array_test.go
+++ b/pkg/util/array_test.go
@@ -1,26 +1,23 @@
 package util
 
 import (
-	"bytes"
 	"testing"
+
+	"github.com/stretchr/testify/require"
 )
 
 func TestArrayEvenReverse(t *testing.T) {
 	arr := []byte{0x01, 0x02, 0x03, 0x04}
 	have := ArrayReverse(arr)
 	want := []byte{0x04, 0x03, 0x02, 0x01}
-	if !bytes.Equal(have, want) {
-		t.Fatalf("expected %v got %v", want, have)
-	}
+	require.Equal(t, want, have)
 }
 
 func TestArrayOddReverse(t *testing.T) {
 	arr := []byte{0x01, 0x02, 0x03, 0x04, 0x05}
 	have := ArrayReverse(arr)
 	want := []byte{0x05, 0x04, 0x03, 0x02, 0x01}
-	if !bytes.Equal(have, want) {
-		t.Fatalf("expected %v got %v", want, have)
-	}
+	require.Equal(t, want, have)
 }
 
 // This tests a bug that occurred with arrays of size 1
@@ -28,7 +25,5 @@ func TestArrayReverseLen2(t *testing.T) {
 	arr := []byte{0x01}
 	have := ArrayReverse(arr)
 	want := []byte{0x01}
-	if !bytes.Equal(have, want) {
-		t.Fatalf("expected %v got %v", want, have)
-	}
+	require.Equal(t, want, have)
 }
diff --git a/pkg/util/uint160_test.go b/pkg/util/uint160_test.go
index 20a4ff541..f2a37a74d 100644
--- a/pkg/util/uint160_test.go
+++ b/pkg/util/uint160_test.go
@@ -5,54 +5,42 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestUint160UnmarshalJSON(t *testing.T) {
 	str := "2d3b96ae1bcc5a585e075e3b81920210dec16302"
 	expected, err := Uint160DecodeString(str)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assert.NoError(t, err)
 
 	// UnmarshalJSON decodes hex-strings
 	var u1, u2 Uint160
 
-	if err = u1.UnmarshalJSON([]byte(`"` + str + `"`)); err != nil {
-		t.Fatal(err)
-	}
+	assert.NoError(t, u1.UnmarshalJSON([]byte(`"`+str+`"`)))
 	assert.True(t, expected.Equals(u1))
 
 	s, err := expected.MarshalJSON()
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
 
 	// UnmarshalJSON decodes hex-strings prefixed by 0x
-	if err = u2.UnmarshalJSON(s); err != nil {
-		t.Fatal(err)
-	}
+	assert.NoError(t, u2.UnmarshalJSON(s))
 	assert.True(t, expected.Equals(u1))
 }
 
 func TestUInt160DecodeString(t *testing.T) {
 	hexStr := "2d3b96ae1bcc5a585e075e3b81920210dec16302"
 	val, err := Uint160DecodeString(hexStr)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assert.NoError(t, err)
 	assert.Equal(t, hexStr, val.String())
 }
 
 func TestUint160DecodeBytes(t *testing.T) {
 	hexStr := "2d3b96ae1bcc5a585e075e3b81920210dec16302"
 	b, err := hex.DecodeString(hexStr)
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
+
 	val, err := Uint160DecodeBytes(b)
-	if err != nil {
-		t.Fatal(err)
-	}
+	assert.NoError(t, err)
 	assert.Equal(t, hexStr, val.String())
 }
 
@@ -61,19 +49,12 @@ func TestUInt160Equals(t *testing.T) {
 	b := "4d3b96ae1bcc5a585e075e3b81920210dec16302"
 
 	ua, err := Uint160DecodeString(a)
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
+
 	ub, err := Uint160DecodeString(b)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if ua.Equals(ub) {
-		t.Fatalf("%s and %s cannot be equal", ua, ub)
-	}
-	if !ua.Equals(ua) {
-		t.Fatalf("%s and %s must be equal", ua, ua)
-	}
+	require.NoError(t, err)
+	assert.False(t, ua.Equals(ub), "%s and %s cannot be equal", ua, ub)
+	assert.True(t, ua.Equals(ua), "%s and %s must be equal", ua, ua)
 }
 
 func TestUInt160Less(t *testing.T) {
diff --git a/pkg/util/uint256_test.go b/pkg/util/uint256_test.go
index 975edec9f..1c6e58305 100644
--- a/pkg/util/uint256_test.go
+++ b/pkg/util/uint256_test.go
@@ -12,49 +12,36 @@ import (
 func TestUint256UnmarshalJSON(t *testing.T) {
 	str := "f037308fa0ab18155bccfc08485468c112409ea5064595699e98c545f245f32d"
 	expected, err := Uint256DecodeReverseString(str)
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
 
 	// UnmarshalJSON decodes hex-strings
 	var u1, u2 Uint256
 
-	if err = u1.UnmarshalJSON([]byte(`"` + str + `"`)); err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, u1.UnmarshalJSON([]byte(`"`+str+`"`)))
 	assert.True(t, expected.Equals(u1))
 
 	s, err := expected.MarshalJSON()
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
 
 	// UnmarshalJSON decodes hex-strings prefixed by 0x
-	if err = u2.UnmarshalJSON(s); err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, u2.UnmarshalJSON(s))
 	assert.True(t, expected.Equals(u1))
 }
 
 func TestUint256DecodeString(t *testing.T) {
 	hexStr := "f037308fa0ab18155bccfc08485468c112409ea5064595699e98c545f245f32d"
 	val, err := Uint256DecodeReverseString(hexStr)
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
 	assert.Equal(t, hexStr, val.ReverseString())
 }
 
 func TestUint256DecodeBytes(t *testing.T) {
 	hexStr := "f037308fa0ab18155bccfc08485468c112409ea5064595699e98c545f245f32d"
 	b, err := hex.DecodeString(hexStr)
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
+
 	val, err := Uint256DecodeReverseBytes(b)
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
 	assert.Equal(t, hexStr, val.ReverseString())
 }
 
@@ -63,19 +50,12 @@ func TestUInt256Equals(t *testing.T) {
 	b := "e287c5b29a1b66092be6803c59c765308ac20287e1b4977fd399da5fc8f66ab5"
 
 	ua, err := Uint256DecodeReverseString(a)
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
+
 	ub, err := Uint256DecodeReverseString(b)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if ua.Equals(ub) {
-		t.Fatalf("%s and %s cannot be equal", ua, ub)
-	}
-	if !ua.Equals(ua) {
-		t.Fatalf("%s and %s must be equal", ua, ua)
-	}
+	require.NoError(t, err)
+	assert.False(t, ua.Equals(ub), "%s and %s cannot be equal", ua, ub)
+	assert.True(t, ua.Equals(ua), "%s and %s must be equal", ua, ua)
 }
 
 func TestUint256_Serializable(t *testing.T) {