From f7e20d769f4c014725fb4eb2dba7059abe51d78e Mon Sep 17 00:00:00 2001
From: Vilen Topchii <32271530+vtopc@users.noreply.github.com>
Date: Mon, 18 Nov 2024 21:37:10 +0200
Subject: [PATCH] errcheck

---
 common_test.go   |  6 +++++-
 mailgun_test.go  |  3 ++-
 messages_test.go | 27 ++++++++++++++++++---------
 webhooks_test.go |  6 +++---
 4 files changed, 28 insertions(+), 14 deletions(-)

diff --git a/common_test.go b/common_test.go
index 5c4481e8..0867f854 100644
--- a/common_test.go
+++ b/common_test.go
@@ -13,7 +13,11 @@ import (
 func randomString(n int, prefix string) string {
 	const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
 	var bytes = make([]byte, n)
-	rand.Read(bytes)
+	_, err := rand.Read(bytes)
+	if err != nil {
+		panic(fmt.Sprintf("rand.Read: %v", err))
+	}
+
 	for i, b := range bytes {
 		bytes[i] = alphanum[b%byte(len(alphanum))]
 	}
diff --git a/mailgun_test.go b/mailgun_test.go
index 3f0d0970..f4e11c74 100644
--- a/mailgun_test.go
+++ b/mailgun_test.go
@@ -43,7 +43,8 @@ func TestValidBaseAPI(t *testing.T) {
 		b, err := json.Marshal(resp)
 		require.NoError(t, err)
 
-		w.Write(b)
+		_, err = w.Write(b)
+		require.NoError(t, err)
 	}))
 
 	apiBases := []string{
diff --git a/messages_test.go b/messages_test.go
index 7385c70a..dc0fe650 100644
--- a/messages_test.go
+++ b/messages_test.go
@@ -116,7 +116,8 @@ func TestSendMGSTO(t *testing.T) {
 
 		ctx := context.Background()
 		m := mailgun.NewMessage(fromUser, exampleSubject, exampleText, toUser)
-		m.SetSTOPeriod("24h")
+		err = m.SetSTOPeriod("24h")
+		require.NoError(t, err)
 		msg, id, err := mg.Send(ctx, m)
 		require.NoError(t, err)
 		t.Log("TestSendMGSTO:MSG(" + msg + "),ID(" + id + ")")
@@ -218,9 +219,12 @@ func TestSendMGTag(t *testing.T) {
 
 		ctx := context.Background()
 		m := mailgun.NewMessage(fromUser, exampleSubject, exampleText+"Tags Galore!\n", toUser)
-		m.AddTag("FooTag")
-		m.AddTag("BarTag")
-		m.AddTag("BlortTag")
+		err = m.AddTag("FooTag")
+		require.NoError(t, err)
+		err = m.AddTag("BarTag")
+		require.NoError(t, err)
+		err = m.AddTag("BlortTag")
+		require.NoError(t, err)
 		msg, id, err := mg.Send(ctx, m)
 		require.NoError(t, err)
 		t.Log("TestSendTag:MSG(" + msg + "),ID(" + id + ")")
@@ -255,7 +259,8 @@ func TestSendMGBatchFailRecipients(t *testing.T) {
 
 		m := mailgun.NewMessage(fromUser, exampleSubject, exampleText+"Batch\n")
 		for i := 0; i < mailgun.MaxNumberOfRecipients; i++ {
-			m.AddRecipient("") // We expect this to indicate a failure at the API
+			err := m.AddRecipient("") // We expect this to indicate a failure at the API
+			require.NoError(t, err)
 		}
 		err := m.AddRecipientAndVariables(toUser, nil)
 		// In case of error the SDK didn't send the message,
@@ -397,10 +402,14 @@ func TestSendMGMessageVariables(t *testing.T) {
 	mg.SetAPIBase(srv.URL + "/v3")
 
 	m := mailgun.NewMessage(fromUser, exampleSubject, exampleText, toUser)
-	m.AddVariable(exampleStrVarKey, exampleStrVarVal)
-	m.AddVariable(exampleBoolVarKey, false)
-	m.AddVariable(exampleMapVarKey, exampleMapVarVal)
-	m.AddTemplateVariable("templateVariable", exampleTemplateVariable)
+	err := m.AddVariable(exampleStrVarKey, exampleStrVarVal)
+	require.NoError(t, err)
+	err = m.AddVariable(exampleBoolVarKey, false)
+	require.NoError(t, err)
+	err = m.AddVariable(exampleMapVarKey, exampleMapVarVal)
+	require.NoError(t, err)
+	err = m.AddTemplateVariable("templateVariable", exampleTemplateVariable)
+	require.NoError(t, err)
 
 	msg, id, err := mg.Send(context.Background(), m)
 	require.NoError(t, err)
diff --git a/webhooks_test.go b/webhooks_test.go
index 90a8ae8a..0dcfcaf2 100644
--- a/webhooks_test.go
+++ b/webhooks_test.go
@@ -149,7 +149,7 @@ func buildMultipartFormRequest(fields map[string]string) *http.Request {
 	writer := multipart.NewWriter(buf)
 
 	for k, v := range fields {
-		writer.WriteField(k, v)
+		_ = writer.WriteField(k, v)
 	}
 
 	writer.Close()
@@ -171,8 +171,8 @@ func getSignatureFields(key string, signed bool) map[string]string {
 
 	if signed {
 		h := hmac.New(sha256.New, []byte(key))
-		io.WriteString(h, fields["timestamp"])
-		io.WriteString(h, fields["token"])
+		_, _ = io.WriteString(h, fields["timestamp"])
+		_, _ = io.WriteString(h, fields["token"])
 		hash := h.Sum(nil)
 
 		fields["signature"] = hex.EncodeToString(hash)