diff --git a/errors_test.go b/errors_test.go
index 3083d59..b2a2a67 100644
--- a/errors_test.go
+++ b/errors_test.go
@@ -27,7 +27,6 @@ func TestJSErrorFormat(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.name, func(t *testing.T) {
 			t.Parallel()
 			if s := fmt.Sprintf("%v", tt.err); s != tt.defaultVerb {
diff --git a/function_test.go b/function_test.go
index c141378..5894479 100644
--- a/function_test.go
+++ b/function_test.go
@@ -118,7 +118,6 @@ func TestFunctionCallError(t *testing.T) {
 	require.ErrorAs(t, err, &jsErr)
 	require.Equal(t, "error", jsErr.Message)
 	require.Equal(t, "script.js:1:21", jsErr.Location)
-
 }
 
 func TestFunctionSourceMapUrl(t *testing.T) {
diff --git a/json_test.go b/json_test.go
index 20715f4..9316d5d 100644
--- a/json_test.go
+++ b/json_test.go
@@ -5,10 +5,10 @@
 package v8go_test
 
 import (
-	"errors"
 	"fmt"
 	"testing"
 
+	"github.com/stretchr/testify/require"
 	"github.com/zeiss/v8go"
 	v8 "github.com/zeiss/v8go"
 )
@@ -29,9 +29,7 @@ func TestJSONParse(t *testing.T) {
 	}
 
 	var jerr *v8go.JSError
-	if errors.As(err, &jerr) {
-		t.Errorf("expected error to be of type JSError, got: %T", err)
-	}
+	require.ErrorAs(t, err, &jerr)
 }
 
 func TestJSONStringify(t *testing.T) {
diff --git a/object_template_test.go b/object_template_test.go
index 6665fe1..ff669a9 100644
--- a/object_template_test.go
+++ b/object_template_test.go
@@ -49,7 +49,6 @@ func TestObjectTemplate(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.name, func(t *testing.T) {
 			setError(t, obj.Set(tt.name, tt.value, 0))
 		})
@@ -111,7 +110,6 @@ func TestGlobalObjectTemplate(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.source, func(t *testing.T) {
 			ctx := v8.NewContext(iso, tt.global())
 			val, err := ctx.RunScript(tt.source, "test.js")
diff --git a/value_test.go b/value_test.go
index 80a6fc1..c45a908 100644
--- a/value_test.go
+++ b/value_test.go
@@ -48,7 +48,6 @@ func TestValueFormatting(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.source, func(t *testing.T) {
 			val, _ := ctx.RunScript(tt.source, "test.js")
 			if s := fmt.Sprintf("%v", val); s != tt.defaultVerb {
@@ -86,7 +85,6 @@ func TestValueString(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.name, func(t *testing.T) {
 			result, _ := ctx.RunScript(tt.source, "test.js")
 			str := result.String()
@@ -115,7 +113,6 @@ func TestNewValue(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.name, func(t *testing.T) {
 			val, err := ctx.RunScript(tt.predicate, "test.js")
 			if err != nil {
@@ -160,7 +157,6 @@ func TestValueDetailString(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.name, func(t *testing.T) {
 			result, _ := ctx.RunScript(tt.source, "test.js")
 			str := result.DetailString()
@@ -195,7 +191,6 @@ func TestValueBoolean(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.source, func(t *testing.T) {
 			val, _ := ctx.RunScript(tt.source, "test.js")
 			if b := val.Boolean(); b != tt.out {
@@ -258,7 +253,6 @@ func TestValueArrayIndex(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.source, func(t *testing.T) {
 			val, _ := ctx.RunScript(tt.source, "test.js")
 			idx, ok := val.ArrayIndex()
@@ -301,7 +295,6 @@ func TestValueInt32(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.source, func(t *testing.T) {
 			val, _ := ctx.RunScript(tt.source, "test.js")
 			if i32 := val.Int32(); i32 != tt.expected {
@@ -340,7 +333,6 @@ func TestValueInteger(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.source, func(t *testing.T) {
 			val, _ := ctx.RunScript(tt.source, "test.js")
 			if i64 := val.Integer(); i64 != tt.expected {
@@ -377,7 +369,6 @@ func TestValueNumber(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.source, func(t *testing.T) {
 			val, _ := ctx.RunScript(tt.source, "test.js")
 			f64 := val.Number()
@@ -410,7 +401,6 @@ func TestValueUint32(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.source, func(t *testing.T) {
 			val, _ := ctx.RunScript(tt.source, "test.js")
 			if u32 := val.Uint32(); u32 != tt.expected {
@@ -441,7 +431,6 @@ func TestValueBigInt(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.source, func(t *testing.T) {
 			ctx := v8.NewContext(iso)
 			defer ctx.Close()
@@ -636,7 +625,6 @@ func TestValueIsXXX(t *testing.T) {
 		{"new Proxy({},{})", (*v8.Value).IsProxy},
 	}
 	for _, tt := range tests {
-
 		t.Run(tt.source, func(t *testing.T) {
 			ctx := v8.NewContext(iso)
 			defer ctx.Close()
@@ -694,7 +682,6 @@ func TestValueMarshalJSON(t *testing.T) {
 	}
 
 	for _, tt := range tests {
-
 		t.Run(tt.name, func(t *testing.T) {
 			ctx := v8.NewContext(iso)
 			defer ctx.Close()