feat: percentage

tests/percentage.test.ts

@@ -0,0 +1,30 @@
+// did I overenginner these tests?
+import { percentage } from "../src/index";
+import { describe, it, expect } from 'vitest';
+
+describe('percentage', () => {
+    it('should return 50% when 1 is half of 2', () => {
+        expect(percentage(1, 2)).toBe(50);
+    });
+    it('should return 0% when 0 is half of 2', () => {
+        expect(percentage(0, 2)).toBe(0);
+    });
+    it('should return 100% when 2 is half of 2', () => {
+        expect(percentage(2, 2)).toBe(100);
+    });
+    it('should return 100% when 2 is half of 1', () => {
+        expect(percentage(2, 1)).toBe(100);
+    });
+    it('should return 200% when 2 is half of 1 and allowNumNot100 is true', () => {
+        expect(percentage(2, 1, true)).toBe(200);
+    })
+    it('should throw an error when total is 0', () => {
+        expect(() => percentage(1, 0)).toThrow();
+    });
+    it('should throw an error when partial is negative', () => {
+        expect(() => percentage(-1, 2)).toThrow();
+    });
+    it('should throw an error when total is negative', () => {
+        expect(() => percentage(1, -2)).toThrow();
+    });
+})

tests/randomString.test.ts

@@ -1,4 +1,4 @@
-import { randomString } from '../src/index.ts'
+import { randomString } from '../src/index'
 import { describe, it, expect } from 'vitest'
 
 describe('randomString', () => {