diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index 361d1abadd..42b4f613e3 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -19,8 +19,6 @@ jobs:
         npx standard
         npm ci
         npm run build --if-present
-        # TODO: Remove the next line when #539 is fixed.
-        rm  Linear-Algebra/test/test.js String/LevenshteinDistance.test.js
         npm test
       env:
         CI: true
diff --git a/Linear-Algebra/src/la_lib.js b/Linear-Algebra/src/la_lib.js
index be9f507def..bba32f4aac 100644
--- a/Linear-Algebra/src/la_lib.js
+++ b/Linear-Algebra/src/la_lib.js
@@ -5,7 +5,8 @@
     The namespace LinearAlgebra contains useful classes and functions for dealing with
     linear algebra under JavaScript.
 */
-var LinearAlgebra;
+let LinearAlgebra = {};
+
 (function (LinearAlgebra) {
   /*
         class: Vector
@@ -309,3 +310,5 @@ var LinearAlgebra;
   }()) // end of class Matrix
   LinearAlgebra.Matrix = Matrix
 })(LinearAlgebra || (LinearAlgebra = {})) // end of namespace LinearAlgebra
+
+export default LinearAlgebra
diff --git a/Linear-Algebra/test/test.js b/Linear-Algebra/test/test.js
index 5f1892db89..6fac6c62ae 100644
--- a/Linear-Algebra/test/test.js
+++ b/Linear-Algebra/test/test.js
@@ -11,7 +11,7 @@ var assert = require('assert')
 var fs = require('fs')
 
 // file is included here
-eval(fs.readFileSync('src/la_lib.js') + '')
+import LinearAlgebra from '../src/la_lib.js';
 // Tests goes here
 
 // creating some vectors
diff --git a/String/LevenshteinDistance.js b/String/LevenshteinDistance.js
index acb09a529d..56bba291bc 100644
--- a/String/LevenshteinDistance.js
+++ b/String/LevenshteinDistance.js
@@ -48,4 +48,4 @@ const levenshteinDistance = (a, b) => {
   return distanceMatrix[b.length][a.length]
 }
 
-export { levenshteinDistance }
+export default levenshteinDistance
diff --git a/String/LevenshteinDistance.test.js b/String/LevenshteinDistance.test.js
index 777884c366..f113da2929 100644
--- a/String/LevenshteinDistance.test.js
+++ b/String/LevenshteinDistance.test.js
@@ -1,4 +1,4 @@
-import levenshteinDistance from './LevenshteinDistance'
+import levenshteinDistance from './LevenshteinDistance.js'
 
 describe('levenshteinDistance', () => {
   it('should calculate edit distance between two strings', () => {
@@ -14,13 +14,13 @@ describe('levenshteinDistance', () => {
     // Should just substitute i with o, m with g and insert e at end
     expect(levenshteinDistance('firm', 'forge')).toBe(3)
 
-    // Should just substitute i with s, g with i, h with t and delete f from front
-    expect(levenshteinDistance('fighting', 'sitting')).toBe(4)
+    // Should just substitute f with s, g with t and delete h
+    expect(levenshteinDistance('fighting', 'sitting')).toBe(3)
 
     // Should add 4 letters b, a, s and e at the beginning.
     expect(levenshteinDistance('ball', 'baseball')).toBe(4)
 
     // Should delete 4 letters b, a, s and e at the beginning.
-    expect(levenshteinDistance('baseball', 'foot')).toBe(4)
+    expect(levenshteinDistance('baseball', 'ball')).toBe(4)
   })
 })