Move the isEmptyObj helper function from src/shared/util.js to test/unit/test_utils.js

Since this helper function is no longer used anywhere in the main code-base, but only in a couple of unit-tests, it's thus being moved to a more appropriate spot.

Finally, the implementation of `isEmptyObj` is also tweaked slightly by removing the manual loop.

src/shared/util.js

@@ -793,13 +793,6 @@ function utf8StringToString(str) {
   return unescape(encodeURIComponent(str));
 }
 
-function isEmptyObj(obj) {
-  for (const key in obj) {
-    return false;
-  }
-  return true;
-}
-
 function isBool(v) {
   return typeof v === "boolean";
 }
@@ -931,7 +924,6 @@ export {
   isArrayBuffer,
   isArrayEqual,
   isBool,
-  isEmptyObj,
   isNum,
   isString,
   isSameOrigin,

test/unit/metadata_spec.js

@@ -13,7 +13,7 @@
  * limitations under the License.
  */
 
-import { isEmptyObj } from "../../src/shared/util.js";
+import { isEmptyObj } from "./test_utils.js";
 import { Metadata } from "../../src/display/metadata.js";
 
 describe("metadata", function () {

test/unit/test_utils.js

@@ -175,6 +175,14 @@ function createIdFactory(pageIndex) {
   return page.idFactory;
 }
 
+function isEmptyObj(obj) {
+  assert(
+    typeof obj === "object" && obj !== null,
+    "isEmptyObj - invalid argument."
+  );
+  return Object.keys(obj).length === 0;
+}
+
 export {
   DOMFileReaderFactory,
   NodeFileReaderFactory,
@@ -184,4 +192,5 @@ export {
   buildGetDocumentParams,
   TEST_PDFS_PATH,
   createIdFactory,
+  isEmptyObj,
 };

test/unit/util_spec.js

@@ -19,7 +19,6 @@ import {
   createValidAbsoluteUrl,
   isArrayBuffer,
   isBool,
-  isEmptyObj,
   isNum,
   isSameOrigin,
   isString,
@@ -89,16 +88,6 @@ describe("util", function () {
     });
   });
 
-  describe("isEmptyObj", function () {
-    it("handles empty objects", function () {
-      expect(isEmptyObj({})).toEqual(true);
-    });
-
-    it("handles non-empty objects", function () {
-      expect(isEmptyObj({ foo: "bar" })).toEqual(false);
-    });
-  });
-
   describe("isNum", function () {
     it("handles numeric values", function () {
       expect(isNum(1)).toEqual(true);