diff --git a/src/helpers/url-query-string-encoder.spec.js b/src/helpers/url-query-string-encoder.spec.js
new file mode 100644
index 00000000..1d11f7d6
--- /dev/null
+++ b/src/helpers/url-query-string-encoder.spec.js
@@ -0,0 +1,21 @@
+import encodeParameter from '@/helpers/url-query-string-encoder';
+
+describe('url-query-string-encoder', () => {
+    describe('encodeParameter', () => {
+        test.each([
+            ['', ''],
+            ['/', '%2F'],
+            ['//  ', '%2F%2F  '],
+            ['/ap ple', '%2Fap ple'],
+            ['ap/ple', 'ap%2Fple'],
+            ['apple /', 'apple %2F'],
+            ['//a/pp/le/', '%2F%2Fa%2Fpp%2Fle%2F']
+        ])('Given %p returns %p', (input, expected) => {
+            // Act
+            var result = encodeParameter(input);
+
+            // Assert
+            expect(result).toEqual(expected);
+        })
+    });
+})
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