fixes & tests (#815)

src/transformers/utilities/rgbaFloatToHex.test.ts

@@ -0,0 +1,16 @@
+import {rgbaFloatToHex} from './rgbaFloatToHex'
+
+describe('Utilities: rgbaFloatToHex', () => {
+  it('valid RgbaFloat value', () => {
+    expect(rgbaFloatToHex({a: 1, b: 0.6, g: 0.4, r: 0.2})).toStrictEqual('#336699')
+    expect(rgbaFloatToHex({a: 0, b: 0.3, g: 0.4, r: 0.2})).toStrictEqual('#33664c')
+    expect(rgbaFloatToHex({b: 0.6, g: 0.4, r: 0.2})).toStrictEqual('#336699')
+    expect(rgbaFloatToHex({b: 0.56, g: 0.35, r: 0.123344})).toStrictEqual('#1f598e')
+  })
+
+  it('Invalid values', () => {
+    expect(() => rgbaFloatToHex({a: 1, b: 0.6, g: 0.4, r: 2})).toThrow(
+      'Invalid RgbaFloat value. R, G and B values must be between 0 and 1',
+    )
+  })
+})

src/transformers/utilities/rgbaFloatToHex.ts

@@ -1,5 +1,15 @@
 export const rgbaFloatToHex = ({r, g, b, a}: {r: number; g: number; b: number; a?: number}, alpha = true): string => {
   const values = [r, g, b, alpha === true && a && a < 1 ? a : undefined].filter(item => item !== undefined) as number[]
 
-  return `#${values.map(v => `${(v * 255).toString(16)}`.padStart(2, '0')).join('')}`
+  if (r > 1 || r < 0 || g > 1 || g < 0 || b > 1 || b < 0) {
+    throw new Error('Invalid RgbaFloat value. R, G and B values must be between 0 and 1.')
+  }
+
+  return `#${values
+    .map(v =>
+      Number(parseInt(`${v * 255}`, 10))
+        .toString(16)
+        .padStart(2, '0'),
+    )
+    .join('')}`
 }