diff --git a/test/midpoint.test.js b/test/midpoint.test.js
index 74e37e360..7926f2a50 100644
--- a/test/midpoint.test.js
+++ b/test/midpoint.test.js
@@ -1,34 +1,34 @@
 const expect = require('expect');
-const {midpoint} = require('./_30s.js');
+const { midpoint } = require('./_30s.js');
 
 test('midpoint is a Function', () => {
   expect(midpoint).toBeInstanceOf(Function);
 });
 
-test('midpoint(2, 2, 4, 4) = [3, 3]', () => {
-  expect(midpoint(2, 2, 4, 4)).toEqual([3, 3]);
+test('midpoint([2, 2], [4, 4]) = [3, 3]', () => {
+  expect(midpoint([2, 2], [4, 4])).toEqual([3, 3]);
 });
 
-test('midpoint(4, 4, 6, 6) = [5,5]', () => {
-  expect(midpoint(4, 4, 6, 6)).toEqual([5, 5]);
+test('midpoint([4, 4], [6, 6]) = [5,5]', () => {
+  expect(midpoint([4, 4], [6, 6])).toEqual([5, 5]);
 });
 
-test('midpoint(1, 3, 2, 4) = [3,3]', () => {
-  expect(midpoint(1, 3, 2, 4)).toEqual([1.5, 3.5]);
+test('midpoint([1, 3], [2, 4]) = [3,3]', () => {
+  expect(midpoint([1, 3], [2, 4])).toEqual([1.5, 3.5]);
 });
 
-test('midpoint(-2, 0, -2, 4) = [-2,2]', () => {
-  expect(midpoint(-2, 0, -2, 4)).toEqual([-2, 2]);
+test('midpoint([-2, 0], [-2, 4]) = [-2,2]', () => {
+  expect(midpoint([-2, 0], [-2, 4])).toEqual([-2, 2]);
 });
 
-test('midpoint(0, 0, 0, 0) = [0,0]', () => {
-  expect(midpoint(0, 0, 0, 0)).toEqual([0, 0]);
+test('midpoint([0, 0], [0, 0]) = [0,0]', () => {
+  expect(midpoint([0, 0], [0, 0])).toEqual([0, 0]);
 });
 
-test('midpoint(10, -10, 20, 30) = [15, 10]', () => {
-  expect(midpoint(10, -10, 20, 30)).toEqual([15, 10]);
+test('midpoint([10, -10], [20, 30]) = [15, 10]', () => {
+  expect(midpoint([10, -10], [20, 30])).toEqual([15, 10]);
 });
 
-test('midpoint(7.5, -1.3, 2.7, 11.1) = [5.1, 4.8999999999999995]', () => {
-  expect(midpoint(7.5, -1.3, 2.7, 11.1)).toEqual([5.1, 4.8999999999999995]);
+test('midpoint([7.5, -1.3], [2.7, 11.1]) = [5.1, 4.8999999999999995]', () => {
+  expect(midpoint([7.5, -1.3], [2.7, 11.1])).toEqual([5.1, 4.8999999999999995]);
 });