Start adding test coverage

src/web/colors.test.js

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+import { hashText, idColor } from './colors'
+import Color from 'color'
+
+describe('colors.js tests', () => {
+  describe('hashText', () => {
+    it('should return a number within the provided range', () => {
+      const text = 'test'
+      const range = 100
+      const result = hashText(text, range)
+      expect(typeof result).toBe('number')
+      expect(result).toBeGreaterThanOrEqual(0)
+      expect(result).toBeLessThan(range)
+    })
+  })
+
+  describe('idColor', () => {
+    it('should return a Color object', () => {
+      const id = 'test'
+      const result = idColor(id)
+      expect(result).toBeInstanceOf(Color)
+    })
+
+    it('should return white color for empty id', () => {
+      const id = ''
+      const result = idColor(id)
+      expect(result.hex()).toBe('#FFFFFF')
+    })
+
+    it('should generate the same color for the same id', () => {
+      const id = 'test'
+      const result1 = idColor(id)
+      const result2 = idColor(id)
+      expect(result1.hex()).toBe(result2.hex())
+    })
+
+    it('should generate different colors for different ids', () => {
+      const id1 = 'test1'
+      const id2 = 'test2'
+      const result1 = idColor(id1)
+      const result2 = idColor(id2)
+      expect(result1.hex()).not.toBe(result2.hex())
+    })
+  })
+})