Ensured ColorGenerator matches keys in a case insensitive way

src/utils/ColorGenerator.js

@@ -11,6 +11,7 @@ const buildRandomColor = () =>
       .map(() => letters[floor(random() * letters.length)])
       .join('')
   }`;
+const normalizeKey = (key) => key.toLowerCase().trim();
 
 export class ColorGenerator {
   constructor(storage) {
@@ -19,21 +20,24 @@ export class ColorGenerator {
   }
 
   getColorForKey = (key) => {
-    const color = this.colors[key];
+    const normalizedKey = normalizeKey(key);
+    const color = this.colors[normalizedKey];
 
     // If a color has not been set yet, generate a random one and save it
     if (!color) {
-      this.setColorForKey(key, buildRandomColor());
-
-      return this.getColorForKey(key);
+      return this.setColorForKey(normalizedKey, buildRandomColor());
     }
 
     return color;
   };
 
   setColorForKey = (key, color) => {
-    this.colors[key] = color;
+    const normalizedKey = normalizeKey(key);
+
+    this.colors[normalizedKey] = color;
     this.storage.set('colors', this.colors);
+
+    return color;
   }
 }
 

test/utils/ColorGenerator.test.js

@@ -0,0 +1,48 @@
+import * as sinon from 'sinon';
+import { ColorGenerator } from '../../src/utils/ColorGenerator';
+
+describe('ColorGenerator', () => {
+  let colorGenerator;
+  const storageMock = {
+    set: sinon.fake(),
+    get: sinon.fake.returns(undefined),
+  };
+
+  beforeEach(() => {
+    storageMock.set.resetHistory();
+    storageMock.get.resetHistory();
+
+    colorGenerator = new ColorGenerator(storageMock);
+  });
+
+  it('sets a color in the storage and makes it available after that', () => {
+    const color = '#ff0000';
+
+    colorGenerator.setColorForKey('foo', color);
+
+    expect(colorGenerator.getColorForKey('foo')).toEqual(color);
+    expect(storageMock.set.callCount).toEqual(1);
+    expect(storageMock.get.callCount).toEqual(1);
+  });
+
+  it('generates a random color when none is available for requested key', () => {
+    expect(colorGenerator.getColorForKey('bar')).toEqual(expect.stringMatching(/^#(?:[0-9a-fA-F]{6})$/));
+    expect(storageMock.set.callCount).toEqual(1);
+    expect(storageMock.get.callCount).toEqual(1);
+  });
+
+  it('trims and lower cases keys before trying to match', () => {
+    const color = '#ff0000';
+
+    colorGenerator.setColorForKey('foo', color);
+
+    expect(colorGenerator.getColorForKey('  foo')).toEqual(color);
+    expect(colorGenerator.getColorForKey('foO')).toEqual(color);
+    expect(colorGenerator.getColorForKey('FoO')).toEqual(color);
+    expect(colorGenerator.getColorForKey('FOO')).toEqual(color);
+    expect(colorGenerator.getColorForKey('FOO  ')).toEqual(color);
+    expect(colorGenerator.getColorForKey(' FoO  ')).toEqual(color);
+    expect(storageMock.set.callCount).toEqual(1);
+    expect(storageMock.get.callCount).toEqual(1);
+  });
+});