diff --git a/test/add_test.mjs b/test/add_test.mjs
index 75c09221e..55628988f 100644
--- a/test/add_test.mjs
+++ b/test/add_test.mjs
@@ -1,4 +1,4 @@
-import crypto from "crypto";
+import { calculateMD5 } from "./downloadutils.mjs";
 import { execSync } from "child_process";
 import fs from "fs";
 
@@ -22,53 +22,31 @@ if (!fs.existsSync(file)) {
   throw new Error(`PDF file does not exist '${file}'.`);
 }
 
-function calculateMD5(pdfFile, callback) {
-  const hash = crypto.createHash("md5");
-  const stream = fs.createReadStream(pdfFile);
-  stream.on("data", function (data) {
-    hash.update(data);
-  });
-  stream.on("error", function (err) {
-    callback(err);
-  });
-  stream.on("end", function () {
-    const result = hash.digest("hex");
-    callback(null, result);
-  });
-}
-
 function getRandomArbitrary(min, max) {
   return Math.floor(Math.random() * (max - min) + min);
 }
 
-calculateMD5(file, (err, md5) => {
-  if (err) {
-    throw new Error(err);
-  }
-  let contents = fs.readFileSync(gitIgnore, "utf8").split("\n");
-  const randomLine = getRandomArbitrary(10, contents.length - 2);
-  contents.splice(
-    randomLine,
-    0,
-    "!" + file.substring(file.lastIndexOf("/") + 1)
-  );
-  fs.writeFileSync("test/pdfs/.gitignore", contents.join("\n"));
+const md5 = await calculateMD5(file);
 
-  contents = fs.readFileSync(testManifest, "utf8");
-  const pdf = file.substring(file.lastIndexOf("/") + 1, file.length - 4);
-  const randomPoint = getRandomArbitrary(100, contents.length - 20);
-  const bracket = contents.indexOf("},\n", randomPoint);
-  const out =
-    contents.substring(0, bracket) +
-    "},\n" +
-    `    {  "id": "${pdf}",\n` +
-    `       "file": "pdfs/${pdf}.pdf",\n` +
-    `       "md5": "${md5}",\n` +
-    '       "rounds": 1,\n' +
-    '       "type": "eq"\n' +
-    "    " +
-    contents.substring(bracket);
-  fs.writeFileSync("test/test_manifest.json", out);
-  execSync(`git add ${testManifest} ${gitIgnore}`);
-  execSync(`git add ${file}`);
-});
+let contents = fs.readFileSync(gitIgnore, "utf8").split("\n");
+const randomLine = getRandomArbitrary(10, contents.length - 2);
+contents.splice(randomLine, 0, "!" + file.substring(file.lastIndexOf("/") + 1));
+fs.writeFileSync("test/pdfs/.gitignore", contents.join("\n"));
+
+contents = fs.readFileSync(testManifest, "utf8");
+const pdf = file.substring(file.lastIndexOf("/") + 1, file.length - 4);
+const randomPoint = getRandomArbitrary(100, contents.length - 20);
+const bracket = contents.indexOf("},\n", randomPoint);
+const out =
+  contents.substring(0, bracket) +
+  "},\n" +
+  `    {  "id": "${pdf}",\n` +
+  `       "file": "pdfs/${pdf}.pdf",\n` +
+  `       "md5": "${md5}",\n` +
+  '       "rounds": 1,\n' +
+  '       "type": "eq"\n' +
+  "    " +
+  contents.substring(bracket);
+fs.writeFileSync("test/test_manifest.json", out);
+execSync(`git add ${testManifest} ${gitIgnore}`);
+execSync(`git add ${file}`);
diff --git a/test/downloadutils.mjs b/test/downloadutils.mjs
index 9fdbe4780..b79ed401b 100644
--- a/test/downloadutils.mjs
+++ b/test/downloadutils.mjs
@@ -128,4 +128,4 @@ async function verifyManifestFiles(manifest) {
   }
 }
 
-export { downloadManifestFiles, verifyManifestFiles };
+export { calculateMD5, downloadManifestFiles, verifyManifestFiles };