correct null tag test

Author: zhiyuanliang-ms

test/load.test.ts

@@ -90,7 +90,7 @@ const mockedKVs = [{
 }, {
     key: "keyWithNullTag",
     value: "valueWithNullTag",
-    tags: {"nullTag": "\0"}
+    tags: {"nullTag": null}
 }, {
     key: "keyWithEscapedComma",
     value: "valueWithEscapedComma",

test/utils/testHelper.ts

@@ -48,6 +48,9 @@ function _filterKVs(unfilteredKvs: ConfigurationSetting[], listOptions: any) {
         if (tagsFilter.length > 0) {
             tagsMatched = tagsFilter.every(tag => {
                 const [tagName, tagValue] = tag.split("=");
+                if (tagValue === "\0") {
+                    return kv.tags && kv.tags[tagName] === null;
+                }
                 return kv.tags && kv.tags[tagName] === tagValue;
             });
         }