test: improve test to ensure ipv6 compatability (#5113)

api/client_test.go

@@ -23,11 +23,17 @@ func TestConfigSetAddress(t *testing.T) {
 
 	tests := []test{
 		{
-			"bare",
+			"ipv4",
 			"http://127.0.0.1:9200",
 			"http://127.0.0.1:9200",
 			"",
 		},
+		{
+			"ipv6",
+			"http://[::1]:9200",
+			"http://[::1]:9200",
+			"",
+		},
 		{
 			"bare with version",
 			"http://127.0.0.1:9200/v1",

api/proxy/proxy_test.go

@@ -169,6 +169,9 @@ func testSessionAuth(t *testing.T) *targets.SessionAuthorizationData {
 			{
 				Address: "localhost:9202",
 			},
+			{
+				Address: "[::1]:9201",
+			},
 		},
 	}