chore: Fix linter findings for tenv (#12622)

Co-authored-by: Pawel Zak <Pawel Zak>

.golangci.yml

@@ -27,6 +27,7 @@ linters:
     - revive
     - sqlclosecheck
     - staticcheck
+    - tenv
     - tparallel
     - typecheck
     - unconvert
@@ -149,6 +150,11 @@ linters-settings:
   nakedret:
     # make an issue if func has more lines of code than this setting and it has naked returns; default is 30
     max-func-lines: 1
+  tenv:
+    # The option `all` will run against whole test files (`_test.go`) regardless of method/function signatures.
+    # Otherwise, only methods that take `*testing.T`, `*testing.B`, and `testing.TB` as arguments are checked.
+    # Default: false
+    all: true
 
 run:
   # timeout for analysis, e.g. 30s, 5m, default is 1m

config/config_test.go

@@ -480,8 +480,7 @@ func TestConfig_getDefaultConfigPathFromEnvURL(t *testing.T) {
 	defer ts.Close()
 
 	c := NewConfig()
-	err := os.Setenv("TELEGRAF_CONFIG_PATH", ts.URL)
-	require.NoError(t, err)
+	t.Setenv("TELEGRAF_CONFIG_PATH", ts.URL)
 	configPath, err := getDefaultConfigPath()
 	require.NoError(t, err)
 	require.Equal(t, []string{ts.URL}, configPath)

plugins/common/shim/config_test.go

@@ -1,7 +1,6 @@
 package shim
 
 import (
-	"os"
 	"testing"
 	"time"
 
@@ -14,10 +13,8 @@ import (
 )
 
 func TestLoadConfig(t *testing.T) {
-	err := os.Setenv("SECRET_TOKEN", "xxxxxxxxxx")
-	require.NoError(t, err)
-	err = os.Setenv("SECRET_VALUE", `test"\test`)
-	require.NoError(t, err)
+	t.Setenv("SECRET_TOKEN", "xxxxxxxxxx")
+	t.Setenv("SECRET_VALUE", `test"\test`)
 
 	inputs.Add("test", func() telegraf.Input {
 		return &serviceInput{}

plugins/inputs/google_cloud_storage/google_cloud_storage_test.go

@@ -416,7 +416,5 @@ func readJSON(t *testing.T, jsonFilePath string) []byte {
 }
 
 func emulatorSetEnv(t *testing.T, srv *httptest.Server) {
-	if err := os.Setenv("STORAGE_EMULATOR_HOST", strings.ReplaceAll(srv.URL, "http://", "")); err != nil {
-		t.Error(err)
-	}
+	t.Setenv("STORAGE_EMULATOR_HOST", strings.ReplaceAll(srv.URL, "http://", ""))
 }

plugins/outputs/azure_monitor/azure_monitor_test.go

@@ -6,15 +6,15 @@ import (
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
-	"os"
 	"testing"
 	"time"
 
 	"github.com/Azure/go-autorest/autorest"
 	"github.com/Azure/go-autorest/autorest/adal"
+	"github.com/stretchr/testify/require"
+
 	"github.com/influxdata/telegraf"
 	"github.com/influxdata/telegraf/testutil"
-	"github.com/stretchr/testify/require"
 )
 
 func TestAggregate(t *testing.T) {
@@ -214,7 +214,7 @@ func TestAggregate(t *testing.T) {
 			msiEndpoint, err := adal.GetMSIVMEndpoint()
 			require.NoError(t, err)
 
-			os.Setenv("MSI_ENDPOINT", msiEndpoint)
+			t.Setenv("MSI_ENDPOINT", msiEndpoint)
 			err = tt.plugin.Connect()
 			require.NoError(t, err)
 
@@ -236,6 +236,13 @@ func TestAggregate(t *testing.T) {
 }
 
 func TestWrite(t *testing.T) {
+	// Set up a fake environment for Authorizer
+	// This used to fake an MSI environment, but since https://github.com/Azure/go-autorest/pull/670/files it's no longer possible,
+	// So we fake a user/password authentication
+	t.Setenv("AZURE_CLIENT_ID", "fake")
+	t.Setenv("AZURE_USERNAME", "fake")
+	t.Setenv("AZURE_PASSWORD", "fake")
+
 	readBody := func(r *http.Request) ([]*azureMonitorMetric, error) {
 		gz, err := gzip.NewReader(r.Body)
 		if err != nil {
@@ -373,23 +380,3 @@ func TestWrite(t *testing.T) {
 		})
 	}
 }
-
-func TestMain(m *testing.M) {
-	// Set up a fake environment for Authorizer
-	// This used to fake an MSI environment, but since https://github.com/Azure/go-autorest/pull/670/files it's no longer possible,
-	// So we fake a user/password authentication
-	err := os.Setenv("AZURE_CLIENT_ID", "fake")
-	if err != nil {
-		panic(err)
-	}
-	err = os.Setenv("AZURE_USERNAME", "fake")
-	if err != nil {
-		panic(err)
-	}
-	err = os.Setenv("AZURE_PASSWORD", "fake")
-	if err != nil {
-		panic(err)
-	}
-
-	os.Exit(m.Run())
-}

testutil/testutil_test.go

@@ -17,18 +17,14 @@ func TestDockerHost(t *testing.T) {
 		t.Fatalf("Host should be localhost when DOCKER_HOST is not set. Current value [%s]", host)
 	}
 
-	err = os.Setenv("DOCKER_HOST", "1.1.1.1")
-	require.NoError(t, err)
-
+	t.Setenv("DOCKER_HOST", "1.1.1.1")
 	host = GetLocalHost()
 
 	if host != "1.1.1.1" {
 		t.Fatalf("Host should take DOCKER_HOST value when set. Current value is [%s] and DOCKER_HOST is [%s]", host, os.Getenv("DOCKER_HOST"))
 	}
 
-	err = os.Setenv("DOCKER_HOST", "tcp://1.1.1.1:8080")
-	require.NoError(t, err)
-
+	t.Setenv("DOCKER_HOST", "tcp://1.1.1.1:8080")
 	host = GetLocalHost()
 
 	if host != "1.1.1.1" {