Codacy style changes for test files

test/join/join.js

@@ -1,11 +1,12 @@
 const join = (arr, separator = ',', end = separator) =>
-arr.reduce(
-(acc, val, i) =>
-i === arr.length - 2
-? acc + val + end
-: i === arr.length - 1
-? acc + val
-: acc + val + separator,
-''
-);
+  arr.reduce(
+    (acc, val, i) =>
+      i === arr.length - 2
+        ? acc + val + end
+        : i === arr.length - 1
+          ? acc + val
+          : acc + val + separator,
+    ''
+  );
+
 module.exports = join;