chore: suppress test warnings (#174)

Author: u5surf

t/v3/cluster.t

@@ -9,7 +9,7 @@ if ($etcd_version =~ /^etcd Version: 2/ || $etcd_version =~ /^etcd Version: 3.1.
     plan(skip_all => "etcd is too old, skip v3 protocol");
 } else {
     my $enable_tls = $ENV{ETCD_ENABLE_TLS};
-    if ($enable_tls eq "TRUE") {
+    if (defined($enable_tls) && $enable_tls eq "TRUE") {
         plan(skip_all => "skip test cases with auth when TLS is enabled");
     } else {
         plan 'no_plan';

t/v3/health_check.t

@@ -10,7 +10,7 @@ if ($etcd_version =~ /^etcd Version: 2/ || $etcd_version =~ /^etcd Version: 3.1.
     plan(skip_all => "etcd is too old, skip v3 protocol");
 } else {
     my $enable_tls = $ENV{ETCD_ENABLE_TLS};
-    if ($enable_tls eq "TRUE") {
+    if (defined($enable_tls) && $enable_tls eq "TRUE") {
         plan(skip_all => "skip test cases with auth when TLS is enabled");
     } else {
         plan 'no_plan';

t/v3/mtls.t

@@ -5,7 +5,7 @@ no_long_string();
 repeat_each(1);
 
 my $enable_tls = $ENV{ETCD_ENABLE_MTLS};
-if ($enable_tls eq "TRUE") {
+if (defined($enable_tls) && $enable_tls eq "TRUE") {
     plan 'no_plan';
 } else {
     plan(skip_all => "etcd is not capable for mTLS connection");

t/v3/sni.t

@@ -5,7 +5,7 @@ no_long_string();
 repeat_each(1);
 
 my $enable_tls = $ENV{ETCD_ENABLE_MTLS};
-if ($enable_tls eq "TRUE") {
+if (defined($enable_tls) && $enable_tls eq "TRUE") {
     plan 'no_plan';
 } else {
     plan(skip_all => "etcd is not capable for mTLS connection");

t/v3/tls.t

@@ -5,7 +5,7 @@ no_long_string();
 repeat_each(1);
 
 my $enable_tls = $ENV{ETCD_ENABLE_TLS};
-if ($enable_tls eq "TRUE") {
+if (defined($enable_tls) && $enable_tls eq "TRUE") {
     plan 'no_plan';
 } else {
     plan(skip_all => "etcd is not capable for TLS connection");