diff --git a/test/classes/credentials.ts b/test/classes/credentials.ts
new file mode 100644
index 0000000..09b4cd7
--- /dev/null
+++ b/test/classes/credentials.ts
@@ -0,0 +1,52 @@
+"use strict";
+
+// Public module from npm
+import { expect } from "chai";
+
+// Modules from file
+import Credentials from "../../src/scripts/classes/credentials";
+
+export function suite(): void {
+  it("Check token formatting", async function testValidToken() {
+    // Token example:
+    // 1604309951,0338213c00fcbd894fd9415e6ba08403
+    // 1604309986,ebdb75502337699381f0f55c86353555
+    // 1604310008,2d50d55808e5ec3a157ec01953da9d26
+
+    // Fetch token (is a GET request, we don't need the credentials)
+    const cred = new Credentials(null, null);
+    await cred.fetchToken();
+
+    // Parse token for assert
+    const splitted = cred.token.split(",");
+    const unique = splitted[0];
+    const hash = splitted[1];
+    expect(splitted.length).to.be.equal(2, "The token consists of two parts");
+
+    // Check type of parts
+    expect(isNumeric(unique)).to.be.true;
+    expect(isNumeric(hash)).to.be.false;
+
+    // The second part is most probably the MD5 hash of something
+    expect(hash.length).to.be.equal(32, "Hash should have 32 hex chars");
+  });
+}
+
+//#region Private methods
+
+/**
+ * Check if a string is a number
+ * @author Dan, Ben Aston
+ * @see https://preview.tinyurl.com/y46jqwkt
+ */
+function isNumeric(str: string): boolean {
+  // We only process strings!
+  if (typeof str != "string") return false;
+
+  // Use type coercion to parse the _entirety_ of the string
+  // (`parseFloat` alone does not do this) and ensure strings
+  // of whitespace fail
+  return !isNaN(parseInt(str, 10)) && !isNaN(parseFloat(str));
+}
+
+//#endregion