use describe in math tests

just for better organization

src/utils/math.test.ts

@@ -1,16 +1,20 @@
 import { fmod, sumComplement32 } from './math';
 
-test('fmod of positive numbers', () => {
-    expect(fmod(3, 4)).toBe(3 % 4);
+describe('fmod', () => {
+    test('positive numbers', () => {
+        expect(fmod(3, 4)).toBe(3 % 4);
+    });
+
+    test('negative and positive number', () => {
+        expect(fmod(-3, 4)).toBe(1);
+    });
 });
 
-test('fmod of negative and positive number', () => {
-    expect(fmod(-3, 4)).toBe(1);
-});
-
-test('sumComplement32', () => {
-    // basic test
-    expect(sumComplement32([1, 2, 3, 4, 5])).toBe(-(1 + 2 + 3 + 4 + 5));
-    // overflow
-    expect(sumComplement32([0xffffffff, 0xffffffff])).toBe(-(-1 + -1));
+describe('sumComplement32', () => {
+    test('basic', () => {
+        expect(sumComplement32([1, 2, 3, 4, 5])).toBe(-(1 + 2 + 3 + 4 + 5));
+    });
+    test('overflow', () => {
+        expect(sumComplement32([0xffffffff, 0xffffffff])).toBe(-(-1 + -1));
+    });
 });