Fix serialization test bugs and enable Go 1.27 compat

.github/workflows/lint.yml

@@ -16,11 +16,11 @@ jobs:
     name: run golangci-golint on the project
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
-      - uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
+      - uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7
         with:
           go-version: 'stable'
       - name: golangci-golint
-        uses: golangci/golangci-lint-action@1e7e51e771db61008b38414a730f564565cf7c20 # v9
+        uses: golangci/golangci-lint-action@ba0d7d2ec06a0ea1cb5fa41b2e4a3ab91d21278a # v9
         with:
-          version: v2.9.0
+          version: v2.13.1

.github/workflows/tests.yml

@@ -11,6 +11,7 @@ jobs:
       fail-fast: false
       matrix:
         go:
+          - "1.27"
           - "1.26"
           - "1.25"
           - "1.24"
@@ -22,9 +23,6 @@ jobs:
           - "1.18"
           - "1.17"
           - "1.16"
-          - "1.15"
-          - "1.14"
-          - "1.13"
 
     steps:
       - name: Set up Go ${{ matrix.go }}

cfn/event_test.go

@@ -4,7 +4,7 @@ package cfn
 
 import (
 	"encoding/json"
-	"io/ioutil" //nolint: staticcheck
+	"os"
 	"testing"
 
 	"github.com/aws/aws-lambda-go/events/test"
@@ -13,7 +13,7 @@ import (
 func TestCloudFormationEventMarshaling(t *testing.T) {
 
 	// read json from file
-	inputJSON, err := ioutil.ReadFile("./testdata/cloudformation-event.json")
+	inputJSON, err := os.ReadFile("./testdata/cloudformation-event.json")
 	if err != nil {
 		t.Errorf("could not open test file. details: %v", err)
 	}
@@ -34,5 +34,5 @@ func TestCloudFormationEventMarshaling(t *testing.T) {
 }
 
 func TestCloudFormationMarshalingMalformedJson(t *testing.T) {
-	test.TestMalformedJson(t, Event{})
+	test.TestMalformedJson(t, &Event{})
 }

cfn/response.go

@@ -6,7 +6,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil" //nolint: staticcheck
+	"io"
 	"log"
 	"net/http"
 )
@@ -67,7 +67,7 @@ func (r *Response) sendWith(client httpClient) error {
 		return err
 	}
 
-	body, err = ioutil.ReadAll(res.Body)
+	body, err = io.ReadAll(res.Body)
 	if err != nil {
 		return err
 	}

cfn/wrap_test.go

@@ -8,7 +8,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil" //nolint: staticcheck
+	"io"
 	"net/http"
 	"testing"
 
@@ -209,7 +209,7 @@ func TestWrappedSendFailure(t *testing.T) {
 func extractResponseBody(t *testing.T, req *http.Request) Response {
 	assert.NotContains(t, req.Header, "Content-Type")
 
-	body, err := ioutil.ReadAll(req.Body)
+	body, err := io.ReadAll(req.Body)
 	assert.NoError(t, err)
 	var response Response
 	err = json.Unmarshal(body, &response)

cmd/build-lambda-zip/main.go

@@ -6,7 +6,6 @@ import (
 	"archive/zip"
 	"flag"
 	"fmt"
-	"io/ioutil" //nolint: staticcheck
 	"log"
 	"os"
 	"path/filepath"
@@ -82,7 +81,7 @@ func compressExeAndArgs(outZipPath string, exePath string, args []string) error
 
 	zipWriter := zip.NewWriter(zipFile)
 	defer zipWriter.Close()
-	data, err := ioutil.ReadFile(exePath)
+	data, err := os.ReadFile(exePath)
 	if err != nil {
 		return err
 	}
@@ -97,7 +96,7 @@ func compressExeAndArgs(outZipPath string, exePath string, args []string) error
 		if err != nil {
 			return err
 		}
-		data, err := ioutil.ReadFile(arg)
+		data, err := os.ReadFile(arg)
 		if err != nil {
 			return err
 		}

cmd/build-lambda-zip/main_test.go

@@ -5,7 +5,7 @@ package main
 import (
 	"archive/zip"
 	"fmt"
-	"io/ioutil" //nolint: staticcheck
+	"io"
 	"os"
 	"os/exec"
 	"path"
@@ -34,7 +34,7 @@ func TestSizes(t *testing.T) {
 	}
 	testDir, err := os.Getwd()
 	require.NoError(t, err)
-	tempDir, err := ioutil.TempDir("/tmp", "build-lambda-zip")
+	tempDir, err := os.MkdirTemp("/tmp", "build-lambda-zip")
 	require.NoError(t, err)
 	for _, test := range cases {
 		require.NoError(t, os.Chdir(testDir))
@@ -66,7 +66,7 @@ func TestSizes(t *testing.T) {
 }
 
 func TestCompressExeAndArgs(t *testing.T) {
-	tempDir, err := ioutil.TempDir("/tmp", "build-lambda-zip")
+	tempDir, err := os.MkdirTemp("/tmp", "build-lambda-zip")
 	require.NoError(t, err)
 	defer os.RemoveAll(tempDir)
 
@@ -117,7 +117,7 @@ func TestCompressExeAndArgs(t *testing.T) {
 		link, err := bootstrap.Open()
 		require.NoError(t, err)
 		defer link.Close()
-		linkTarget, err := ioutil.ReadAll(link)
+		linkTarget, err := io.ReadAll(link)
 		require.NoError(t, err)
 		assert.Equal(t, filepath.Base(filePaths[0]), string(linkTarget))
 	})
@@ -148,7 +148,7 @@ func TestCompressExeAndArgs(t *testing.T) {
 				f, err := zf.Open()
 				require.NoError(t, err)
 				defer f.Close()
-				content, err := ioutil.ReadAll(f)
+				content, err := io.ReadAll(f)
 				require.NoError(t, err)
 				assert.Equal(t, fmt.Sprintf("Hello file %d!", expectedIndex), string(content), "in file: %s", zf.Name)
 				expectedIndex++

events/activemq_test.go

@@ -43,5 +43,5 @@ func TestActiveMQEventMarshaling(t *testing.T) {
 }
 
 func TestActiveMQMarshalingMalformedJson(t *testing.T) {
-	test.TestMalformedJson(t, ActiveMQEvent{})
+	test.TestMalformedJson(t, &ActiveMQEvent{})
 }

events/alb_test.go

@@ -2,7 +2,7 @@ package events
 
 import (
 	"encoding/json"
-	"io/ioutil" //nolint: staticcheck
+	"os"
 	"testing"
 
 	"github.com/aws/aws-lambda-go/events/test"
@@ -16,7 +16,7 @@ func TestALBTargetRequestMarshaling(t *testing.T) {
 
 	for _, filename := range inputFiles {
 		// read json from file
-		inputJSON, err := ioutil.ReadFile(filename)
+		inputJSON, err := os.ReadFile(filename)
 		if err != nil {
 			t.Errorf("could not open test file. details: %v", err)
 		}
@@ -37,13 +37,13 @@ func TestALBTargetRequestMarshaling(t *testing.T) {
 }
 
 func TestALBTargetRequestMalformedJson(t *testing.T) {
-	test.TestMalformedJson(t, ALBTargetGroupRequest{})
+	test.TestMalformedJson(t, &ALBTargetGroupRequest{})
 }
 
 func TestALBTargetResponseMarshaling(t *testing.T) {
 
 	// read json from file
-	inputJSON, err := ioutil.ReadFile("./testdata/alb-lambda-target-response.json")
+	inputJSON, err := os.ReadFile("./testdata/alb-lambda-target-response.json")
 	if err != nil {
 		t.Errorf("could not open test file. details: %v", err)
 	}