Refactor certificate output parsing and add unit tests for parseCertOutput function

internal/certbot/manager.go

@@ -126,7 +126,15 @@ func (m *Manager) GetStatus(domain string) *CertStatus {
 		return status
 	}
 
-	for line := range strings.SplitSeq(string(out), "\n") {
+	parseCertOutput(string(out), status)
+
+	return status
+}
+
+// parseCertOutput parses the output of `openssl x509 -noout -enddate -issuer -subject`
+// and populates the given CertStatus.
+func parseCertOutput(output string, status *CertStatus) {
+	for line := range strings.SplitSeq(output, "\n") {
 		line = strings.TrimSpace(line)
 		if strings.HasPrefix(line, "notAfter=") {
 			dateStr := strings.TrimPrefix(line, "notAfter=")
@@ -142,13 +150,11 @@ func (m *Manager) GetStatus(domain string) *CertStatus {
 			status.IssuerCN = strings.TrimPrefix(line, "issuer=")
 		}
 		if strings.HasPrefix(line, "subject=") {
-			if strings.Contains(line, "CN = *.") {
+			if strings.Contains(line, "CN=*.") || strings.Contains(line, "CN = *.") {
 				status.Wildcard = true
 			}
 		}
 	}
-
-	return status
 }
 
 // CertPath returns the fullchain.pem path for a domain.