Replace deprecated ioutil pkg with os & io (#228)

As of Go 1.16, the same functionality is now provided by package io or
package os, and those implementations should be preferred in new code.

So replacing all usage of ioutil pkg with io & os.

formatter/formatter_test.go

@@ -3,7 +3,6 @@ package formatter_test
 import (
 	"bytes"
 	"flag"
-	"io/ioutil"
 	"os"
 	"path"
 	"testing"
@@ -24,10 +23,10 @@ func TestFormatter_FormatSchema(t *testing.T) {
 
 	executeGoldenTesting(t, &goldenConfig{
 		SourceDir: testSourceDir,
-		BaselineFileName: func(cfg *goldenConfig, f os.FileInfo) string {
+		BaselineFileName: func(cfg *goldenConfig, f os.DirEntry) string {
 			return path.Join(testBaselineDir, f.Name())
 		},
-		Run: func(t *testing.T, cfg *goldenConfig, f os.FileInfo) []byte {
+		Run: func(t *testing.T, cfg *goldenConfig, f os.DirEntry) []byte {
 			// load stuff
 			schema, gqlErr := gqlparser.LoadSchema(&ast.Source{
 				Name:  f.Name(),
@@ -62,10 +61,10 @@ func TestFormatter_FormatSchemaDocument(t *testing.T) {
 
 	executeGoldenTesting(t, &goldenConfig{
 		SourceDir: testSourceDir,
-		BaselineFileName: func(cfg *goldenConfig, f os.FileInfo) string {
+		BaselineFileName: func(cfg *goldenConfig, f os.DirEntry) string {
 			return path.Join(testBaselineDir, f.Name())
 		},
-		Run: func(t *testing.T, cfg *goldenConfig, f os.FileInfo) []byte {
+		Run: func(t *testing.T, cfg *goldenConfig, f os.DirEntry) []byte {
 			// load stuff
 			doc, gqlErr := parser.ParseSchema(&ast.Source{
 				Name:  f.Name(),
@@ -100,10 +99,10 @@ func TestFormatter_FormatQueryDocument(t *testing.T) {
 
 	executeGoldenTesting(t, &goldenConfig{
 		SourceDir: testSourceDir,
-		BaselineFileName: func(cfg *goldenConfig, f os.FileInfo) string {
+		BaselineFileName: func(cfg *goldenConfig, f os.DirEntry) string {
 			return path.Join(testBaselineDir, f.Name())
 		},
-		Run: func(t *testing.T, cfg *goldenConfig, f os.FileInfo) []byte {
+		Run: func(t *testing.T, cfg *goldenConfig, f os.DirEntry) []byte {
 			// load stuff
 			doc, gqlErr := parser.ParseQuery(&ast.Source{
 				Name:  f.Name(),
@@ -135,8 +134,8 @@ func TestFormatter_FormatQueryDocument(t *testing.T) {
 type goldenConfig struct {
 	SourceDir        string
 	IsTarget         func(f os.FileInfo) bool
-	BaselineFileName func(cfg *goldenConfig, f os.FileInfo) string
-	Run              func(t *testing.T, cfg *goldenConfig, f os.FileInfo) []byte
+	BaselineFileName func(cfg *goldenConfig, f os.DirEntry) string
+	Run              func(t *testing.T, cfg *goldenConfig, f os.DirEntry) []byte
 }
 
 func executeGoldenTesting(t *testing.T, cfg *goldenConfig) {
@@ -154,7 +153,7 @@ func executeGoldenTesting(t *testing.T, cfg *goldenConfig) {
 		t.Fatal("Run function is required")
 	}
 
-	fs, err := ioutil.ReadDir(cfg.SourceDir)
+	fs, err := os.ReadDir(cfg.SourceDir)
 	if err != nil {
 		t.Fatal(fs)
 	}
@@ -177,13 +176,13 @@ func executeGoldenTesting(t *testing.T, cfg *goldenConfig) {
 				}
 			}
 
-			expected, err := ioutil.ReadFile(expectedFilePath)
+			expected, err := os.ReadFile(expectedFilePath)
 			if os.IsNotExist(err) {
 				err = os.MkdirAll(path.Dir(expectedFilePath), 0755)
 				if err != nil {
 					t.Fatal(err)
 				}
-				err = ioutil.WriteFile(expectedFilePath, result, 0444)
+				err = os.WriteFile(expectedFilePath, result, 0444)
 				if err != nil {
 					t.Fatal(err)
 				}
@@ -205,7 +204,7 @@ func executeGoldenTesting(t *testing.T, cfg *goldenConfig) {
 }
 
 func mustReadFile(name string) string {
-	src, err := ioutil.ReadFile(name)
+	src, err := os.ReadFile(name)
 	if err != nil {
 		panic(err)
 	}

parser/testrunner/runner.go

@@ -1,7 +1,7 @@
 package testrunner
 
 import (
-	"io/ioutil"
+	"os"
 	"strconv"
 	"strings"
 	"testing"
@@ -36,7 +36,7 @@ func (t Token) String() string {
 }
 
 func Test(t *testing.T, filename string, f func(t *testing.T, input string) Spec) {
-	b, err := ioutil.ReadFile(filename)
+	b, err := os.ReadFile(filename)
 	if err != nil {
 		panic(err)
 	}

validator/imported_test.go

@@ -2,7 +2,6 @@ package validator_test
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -172,7 +171,7 @@ func compareErrors(errors gqlerror.List) func(i, j int) bool {
 }
 
 func readYaml(filename string, result interface{}) {
-	b, err := ioutil.ReadFile(filename)
+	b, err := os.ReadFile(filename)
 	if err != nil {
 		panic(err)
 	}

validator/schema_test.go

@@ -1,7 +1,7 @@
 package validator
 
 import (
-	"io/ioutil"
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -20,7 +20,7 @@ func TestLoadSchema(t *testing.T) {
 		require.Equal(t, "The `Boolean` scalar type represents `true` or `false`.", boolDef.Description)
 	})
 	t.Run("swapi", func(t *testing.T) {
-		file, err := ioutil.ReadFile("testdata/swapi.graphql")
+		file, err := os.ReadFile("testdata/swapi.graphql")
 		require.Nil(t, err)
 		s, err := LoadSchema(Prelude, &ast.Source{Input: string(file), Name: "TestLoadSchema"})
 		require.Nil(t, err)
@@ -45,7 +45,7 @@ func TestLoadSchema(t *testing.T) {
 	})
 
 	t.Run("default root operation type names", func(t *testing.T) {
-		file, err := ioutil.ReadFile("testdata/default_root_operation_type_names.graphql")
+		file, err := os.ReadFile("testdata/default_root_operation_type_names.graphql")
 		require.Nil(t, err)
 		s, err := LoadSchema(Prelude, &ast.Source{Input: string(file), Name: "TestLoadSchema"})
 		require.Nil(t, err)
@@ -58,7 +58,7 @@ func TestLoadSchema(t *testing.T) {
 	})
 
 	t.Run("type extensions", func(t *testing.T) {
-		file, err := ioutil.ReadFile("testdata/extensions.graphql")
+		file, err := os.ReadFile("testdata/extensions.graphql")
 		require.Nil(t, err)
 		s, err := LoadSchema(Prelude, &ast.Source{Input: string(file), Name: "TestLoadSchema"})
 		require.Nil(t, err)
@@ -81,7 +81,7 @@ func TestLoadSchema(t *testing.T) {
 	})
 
 	t.Run("interfaces", func(t *testing.T) {
-		file, err := ioutil.ReadFile("testdata/interfaces.graphql")
+		file, err := os.ReadFile("testdata/interfaces.graphql")
 		require.Nil(t, err)
 		s, err := LoadSchema(Prelude, &ast.Source{Input: string(file), Name: "interfaces"})
 		require.Nil(t, err)

validator/vars_test.go

@@ -1,7 +1,7 @@
 package validator_test
 
 import (
-	"io/ioutil"
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -358,7 +358,7 @@ func TestValidateVars(t *testing.T) {
 }
 
 func mustReadFile(name string) string {
-	src, err := ioutil.ReadFile(name)
+	src, err := os.ReadFile(name)
 	if err != nil {
 		panic(err)
 	}