diff --git a/header_test.go b/header_test.go
index bfe1d12..02bab82 100644
--- a/header_test.go
+++ b/header_test.go
@@ -8,6 +8,54 @@ import (
 	"testing"
 )
 
+var (
+	genHeaderTests = []struct {
+		name   string
+		header Header
+		want   string
+	}{
+		{"Header: Content-Description", HeaderContentDescription, "Content-Description"},
+		{"Header: Content-Disposition", HeaderContentDisposition, "Content-Disposition"},
+		{"Header: Content-ID", HeaderContentID, "Content-ID"},
+		{"Header: Content-Language", HeaderContentLang, "Content-Language"},
+		{"Header: Content-Location", HeaderContentLocation, "Content-Location"},
+		{"Header: Content-Transfer-Encoding", HeaderContentTransferEnc, "Content-Transfer-Encoding"},
+		{"Header: Content-Type", HeaderContentType, "Content-Type"},
+		{"Header: Date", HeaderDate, "Date"},
+		{
+			"Header: Disposition-Notification-To", HeaderDispositionNotificationTo,
+			"Disposition-Notification-To",
+		},
+		{"Header: Importance", HeaderImportance, "Importance"},
+		{"Header: In-Reply-To", HeaderInReplyTo, "In-Reply-To"},
+		{"Header: List-Unsubscribe", HeaderListUnsubscribe, "List-Unsubscribe"},
+		{"Header: List-Unsubscribe-Post", HeaderListUnsubscribePost, "List-Unsubscribe-Post"},
+		{"Header: Message-ID", HeaderMessageID, "Message-ID"},
+		{"Header: MIME-Version", HeaderMIMEVersion, "MIME-Version"},
+		{"Header: Organization", HeaderOrganization, "Organization"},
+		{"Header: Precedence", HeaderPrecedence, "Precedence"},
+		{"Header: Priority", HeaderPriority, "Priority"},
+		{"Header: References", HeaderReferences, "References"},
+		{"Header: Reply-To", HeaderReplyTo, "Reply-To"},
+		{"Header: Subject", HeaderSubject, "Subject"},
+		{"Header: User-Agent", HeaderUserAgent, "User-Agent"},
+		{"Header: X-Auto-Response-Suppress", HeaderXAutoResponseSuppress, "X-Auto-Response-Suppress"},
+		{"Header: X-Mailer", HeaderXMailer, "X-Mailer"},
+		{"Header: X-MSMail-Priority", HeaderXMSMailPriority, "X-MSMail-Priority"},
+		{"Header: X-Priority", HeaderXPriority, "X-Priority"},
+	}
+	addrHeaderTests = []struct {
+		name string
+		ah   AddrHeader
+		want string
+	}{
+		{"Address header: From", HeaderFrom, "From"},
+		{"Address header: To", HeaderTo, "To"},
+		{"Address header: Cc", HeaderCc, "Cc"},
+		{"Address header: Bcc", HeaderBcc, "Bcc"},
+	}
+)
+
 func TestImportance_Stringer(t *testing.T) {
 	tests := []struct {
 		name    string
@@ -55,17 +103,7 @@ func TestImportance_Stringer(t *testing.T) {
 }
 
 func TestAddrHeader_Stringer(t *testing.T) {
-	tests := []struct {
-		name string
-		ah   AddrHeader
-		want string
-	}{
-		{"Address header: From", HeaderFrom, "From"},
-		{"Address header: To", HeaderTo, "To"},
-		{"Address header: Cc", HeaderCc, "Cc"},
-		{"Address header: Bcc", HeaderBcc, "Bcc"},
-	}
-	for _, tt := range tests {
+	for _, tt := range addrHeaderTests {
 		t.Run(tt.name, func(t *testing.T) {
 			if tt.ah.String() != tt.want {
 				t.Errorf("wrong string for AddrHeader returned. Expected: %s, got: %s",
@@ -76,44 +114,11 @@ func TestAddrHeader_Stringer(t *testing.T) {
 }
 
 func TestHeader_Stringer(t *testing.T) {
-	tests := []struct {
-		name string
-		h    Header
-		want string
-	}{
-		{"Header: Content-Description", HeaderContentDescription, "Content-Description"},
-		{"Header: Content-Disposition", HeaderContentDisposition, "Content-Disposition"},
-		{"Header: Content-ID", HeaderContentID, "Content-ID"},
-		{"Header: Content-Language", HeaderContentLang, "Content-Language"},
-		{"Header: Content-Location", HeaderContentLocation, "Content-Location"},
-		{"Header: Content-Transfer-Encoding", HeaderContentTransferEnc, "Content-Transfer-Encoding"},
-		{"Header: Content-Type", HeaderContentType, "Content-Type"},
-		{"Header: Date", HeaderDate, "Date"},
-		{"Header: Disposition-Notification-To", HeaderDispositionNotificationTo,
-			"Disposition-Notification-To"},
-		{"Header: Importance", HeaderImportance, "Importance"},
-		{"Header: In-Reply-To", HeaderInReplyTo, "In-Reply-To"},
-		{"Header: List-Unsubscribe", HeaderListUnsubscribe, "List-Unsubscribe"},
-		{"Header: List-Unsubscribe-Post", HeaderListUnsubscribePost, "List-Unsubscribe-Post"},
-		{"Header: Message-ID", HeaderMessageID, "Message-ID"},
-		{"Header: MIME-Version", HeaderMIMEVersion, "MIME-Version"},
-		{"Header: Organization", HeaderOrganization, "Organization"},
-		{"Header: Precedence", HeaderPrecedence, "Precedence"},
-		{"Header: Priority", HeaderPriority, "Priority"},
-		{"Header: References", HeaderReferences, "References"},
-		{"Header: Reply-To", HeaderReplyTo, "Reply-To"},
-		{"Header: Subject", HeaderSubject, "Subject"},
-		{"Header: User-Agent", HeaderUserAgent, "User-Agent"},
-		{"Header: X-Auto-Response-Suppress", HeaderXAutoResponseSuppress, "X-Auto-Response-Suppress"},
-		{"Header: X-Mailer", HeaderXMailer, "X-Mailer"},
-		{"Header: X-MSMail-Priority", HeaderXMSMailPriority, "X-MSMail-Priority"},
-		{"Header: X-Priority", HeaderXPriority, "X-Priority"},
-	}
-	for _, tt := range tests {
+	for _, tt := range genHeaderTests {
 		t.Run(tt.name, func(t *testing.T) {
-			if tt.h.String() != tt.want {
+			if tt.header.String() != tt.want {
 				t.Errorf("wrong string for Header returned. Expected: %s, got: %s",
-					tt.want, tt.h.String())
+					tt.want, tt.header.String())
 			}
 		})
 	}