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diff --git a/packages/taler-wallet-webextension/src/mui/colors/manipulation.test.ts b/packages/taler-wallet-webextension/src/mui/colors/manipulation.test.ts
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+import { expect } from 'chai';
+import {
+  recomposeColor,
+  hexToRgb,
+  rgbToHex,
+  hslToRgb,
+  darken,
+  decomposeColor,
+  emphasize,
+  alpha,
+  getContrastRatio,
+  getLuminance,
+  lighten,
+} from './manipulation';
+
+describe('utils/colorManipulator', () => {
+  describe('recomposeColor', () => {
+    it('converts a decomposed rgb color object to a string` ', () => {
+      expect(
+        recomposeColor({
+          type: 'rgb',
+          values: [255, 255, 255],
+        }),
+      ).to.equal('rgb(255, 255, 255)');
+    });
+
+    it('converts a decomposed rgba color object to a string` ', () => {
+      expect(
+        recomposeColor({
+          type: 'rgba',
+          values: [255, 255, 255, 0.5],
+        }),
+      ).to.equal('rgba(255, 255, 255, 0.5)');
+    });
+
+    it('converts a decomposed hsl color object to a string` ', () => {
+      expect(
+        recomposeColor({
+          type: 'hsl',
+          values: [100, 50, 25],
+        }),
+      ).to.equal('hsl(100, 50%, 25%)');
+    });
+
+    it('converts a decomposed hsla color object to a string` ', () => {
+      expect(
+        recomposeColor({
+          type: 'hsla',
+          values: [100, 50, 25, 0.5],
+        }),
+      ).to.equal('hsla(100, 50%, 25%, 0.5)');
+    });
+  });
+
+  describe('hexToRgb', () => {
+    it('converts a short hex color to an rgb color` ', () => {
+      expect(hexToRgb('#9f3')).to.equal('rgb(153, 255, 51)');
+    });
+
+    it('converts a long hex color to an rgb color` ', () => {
+      expect(hexToRgb('#a94fd3')).to.equal('rgb(169, 79, 211)');
+    });
+
+    it('converts a long alpha hex color to an argb color` ', () => {
+      expect(hexToRgb('#111111f8')).to.equal('rgba(17, 17, 17, 0.973)');
+    });
+  });
+
+  describe('rgbToHex', () => {
+    it('converts an rgb color to a hex color` ', () => {
+      expect(rgbToHex('rgb(169, 79, 211)')).to.equal('#a94fd3');
+    });
+
+    it('converts an rgba color to a hex color` ', () => {
+      expect(rgbToHex('rgba(169, 79, 211, 1)')).to.equal('#a94fd3ff');
+    });
+
+    it('idempotent', () => {
+      expect(rgbToHex('#A94FD3')).to.equal('#A94FD3');
+    });
+  });
+
+  describe('hslToRgb', () => {
+    it('converts an hsl color to an rgb color` ', () => {
+      expect(hslToRgb('hsl(281, 60%, 57%)')).to.equal('rgb(169, 80, 211)');
+    });
+
+    it('converts an hsla color to an rgba color` ', () => {
+      expect(hslToRgb('hsla(281, 60%, 57%, 0.5)')).to.equal('rgba(169, 80, 211, 0.5)');
+    });
+
+    it('allow to convert values only', () => {
+      expect(hslToRgb('hsl(281, 60%, 57%)')).to.equal('rgb(169, 80, 211)');
+    });
+  });
+
+  describe('decomposeColor', () => {
+    it('converts an rgb color string to an object with `type` and `value` keys', () => {
+      const { type, values } = decomposeColor('rgb(255, 255, 255)');
+      expect(type).to.equal('rgb');
+      expect(values).to.deep.equal([255, 255, 255]);
+    });
+
+    it('converts an rgba color string to an object with `type` and `value` keys', () => {
+      const { type, values } = decomposeColor('rgba(255, 255, 255, 0.5)');
+      expect(type).to.equal('rgba');
+      expect(values).to.deep.equal([255, 255, 255, 0.5]);
+    });
+
+    it('converts an hsl color string to an object with `type` and `value` keys', () => {
+      const { type, values } = decomposeColor('hsl(100, 50%, 25%)');
+      expect(type).to.equal('hsl');
+      expect(values).to.deep.equal([100, 50, 25]);
+    });
+
+    it('converts an hsla color string to an object with `type` and `value` keys', () => {
+      const { type, values } = decomposeColor('hsla(100, 50%, 25%, 0.5)');
+      expect(type).to.equal('hsla');
+      expect(values).to.deep.equal([100, 50, 25, 0.5]);
+    });
+
+    it('converts rgba hex', () => {
+      const decomposed = decomposeColor('#111111f8');
+      expect(decomposed).to.deep.equal({
+        type: 'rgba',
+        colorSpace: undefined,
+        values: [17, 17, 17, 0.973],
+      });
+    });
+  });
+
+  describe('getContrastRatio', () => {
+    it('returns a ratio for black : white', () => {
+      expect(getContrastRatio('#000', '#FFF')).to.equal(21);
+    });
+
+    it('returns a ratio for black : black', () => {
+      expect(getContrastRatio('#000', '#000')).to.equal(1);
+    });
+
+    it('returns a ratio for white : white', () => {
+      expect(getContrastRatio('#FFF', '#FFF')).to.equal(1);
+    });
+
+    it('returns a ratio for dark-grey : light-grey', () => {
+      expect(getContrastRatio('#707070', '#E5E5E5')).to.be.approximately(3.93, 0.01);
+    });
+
+    it('returns a ratio for black : light-grey', () => {
+      expect(getContrastRatio('#000', '#888')).to.be.approximately(5.92, 0.01);
+    });
+  });
+
+  describe('getLuminance', () => {
+
+    it('returns a valid luminance for rgb white ', () => {
+      expect(getLuminance('rgba(255, 255, 255)')).to.equal(1);
+      expect(getLuminance('rgb(255, 255, 255)')).to.equal(1);
+    });
+
+    it('returns a valid luminance for rgb mid-grey', () => {
+      expect(getLuminance('rgba(127, 127, 127)')).to.equal(0.212);
+      expect(getLuminance('rgb(127, 127, 127)')).to.equal(0.212);
+    });
+
+    it('returns a valid luminance for an rgb color', () => {
+      expect(getLuminance('rgb(255, 127, 0)')).to.equal(0.364);
+    });
+
+    it('returns a valid luminance from an hsl color', () => {
+      expect(getLuminance('hsl(100, 100%, 50%)')).to.equal(0.735);
+    });
+
+    it('returns an equal luminance for the same color in different formats', () => {
+      const hsl = 'hsl(100, 100%, 50%)';
+      const rgb = 'rgb(85, 255, 0)';
+      expect(getLuminance(hsl)).to.equal(getLuminance(rgb));
+    });
+
+  });
+
+  describe('emphasize', () => {
+    it('lightens a dark rgb color with the coefficient provided', () => {
+      expect(emphasize('rgb(1, 2, 3)', 0.4)).to.equal(lighten('rgb(1, 2, 3)', 0.4));
+    });
+
+    it('darkens a light rgb color with the coefficient provided', () => {
+      expect(emphasize('rgb(250, 240, 230)', 0.3)).to.equal(darken('rgb(250, 240, 230)', 0.3));
+    });
+
+    it('lightens a dark rgb color with the coefficient 0.15 by default', () => {
+      expect(emphasize('rgb(1, 2, 3)')).to.equal(lighten('rgb(1, 2, 3)', 0.15));
+    });
+
+    it('darkens a light rgb color with the coefficient 0.15 by default', () => {
+      expect(emphasize('rgb(250, 240, 230)')).to.equal(darken('rgb(250, 240, 230)', 0.15));
+    });
+
+  });
+
+  describe('alpha', () => {
+    it('converts an rgb color to an rgba color with the value provided', () => {
+      expect(alpha('rgb(1, 2, 3)', 0.4)).to.equal('rgba(1, 2, 3, 0.4)');
+    });
+
+    it('updates an rgba color with the alpha value provided', () => {
+      expect(alpha('rgba(255, 0, 0, 0.2)', 0.5)).to.equal('rgba(255, 0, 0, 0.5)');
+    });
+
+    it('converts an hsl color to an hsla color with the value provided', () => {
+      expect(alpha('hsl(0, 100%, 50%)', 0.1)).to.equal('hsla(0, 100%, 50%, 0.1)');
+    });
+
+    it('updates an hsla color with the alpha value provided', () => {
+      expect(alpha('hsla(0, 100%, 50%, 0.2)', 0.5)).to.equal('hsla(0, 100%, 50%, 0.5)');
+    });
+
+  });
+
+  describe('darken', () => {
+    it("doesn't modify rgb black", () => {
+      expect(darken('rgb(0, 0, 0)', 0.1)).to.equal('rgb(0, 0, 0)');
+    });
+
+    it('darkens rgb white to black when coefficient is 1', () => {
+      expect(darken('rgb(255, 255, 255)', 1)).to.equal('rgb(0, 0, 0)');
+    });
+
+    it('retains the alpha value in an rgba color', () => {
+      expect(darken('rgba(0, 0, 0, 0.5)', 0.1)).to.equal('rgba(0, 0, 0, 0.5)');
+    });
+
+    it('darkens rgb white by 10% when coefficient is 0.1', () => {
+      expect(darken('rgb(255, 255, 255)', 0.1)).to.equal('rgb(229, 229, 229)');
+    });
+
+    it('darkens rgb red by 50% when coefficient is 0.5', () => {
+      expect(darken('rgb(255, 0, 0)', 0.5)).to.equal('rgb(127, 0, 0)');
+    });
+
+    it('darkens rgb grey by 50% when coefficient is 0.5', () => {
+      expect(darken('rgb(127, 127, 127)', 0.5)).to.equal('rgb(63, 63, 63)');
+    });
+
+    it("doesn't modify rgb colors when coefficient is 0", () => {
+      expect(darken('rgb(255, 255, 255)', 0)).to.equal('rgb(255, 255, 255)');
+    });
+
+    it('darkens hsl red by 50% when coefficient is 0.5', () => {
+      expect(darken('hsl(0, 100%, 50%)', 0.5)).to.equal('hsl(0, 100%, 25%)');
+    });
+
+    it("doesn't modify hsl colors when coefficient is 0", () => {
+      expect(darken('hsl(0, 100%, 50%)', 0)).to.equal('hsl(0, 100%, 50%)');
+    });
+
+    it("doesn't modify hsl colors when l is 0%", () => {
+      expect(darken('hsl(0, 50%, 0%)', 0.5)).to.equal('hsl(0, 50%, 0%)');
+    });
+
+  });
+
+  describe('lighten', () => {
+    it("doesn't modify rgb white", () => {
+      expect(lighten('rgb(255, 255, 255)', 0.1)).to.equal('rgb(255, 255, 255)');
+    });
+
+    it('lightens rgb black to white when coefficient is 1', () => {
+      expect(lighten('rgb(0, 0, 0)', 1)).to.equal('rgb(255, 255, 255)');
+    });
+
+    it('retains the alpha value in an rgba color', () => {
+      expect(lighten('rgba(255, 255, 255, 0.5)', 0.1)).to.equal('rgba(255, 255, 255, 0.5)');
+    });
+
+    it('lightens rgb black by 10% when coefficient is 0.1', () => {
+      expect(lighten('rgb(0, 0, 0)', 0.1)).to.equal('rgb(25, 25, 25)');
+    });
+
+    it('lightens rgb red by 50% when coefficient is 0.5', () => {
+      expect(lighten('rgb(255, 0, 0)', 0.5)).to.equal('rgb(255, 127, 127)');
+    });
+
+    it('lightens rgb grey by 50% when coefficient is 0.5', () => {
+      expect(lighten('rgb(127, 127, 127)', 0.5)).to.equal('rgb(191, 191, 191)');
+    });
+
+    it("doesn't modify rgb colors when coefficient is 0", () => {
+      expect(lighten('rgb(127, 127, 127)', 0)).to.equal('rgb(127, 127, 127)');
+    });
+
+    it('lightens hsl red by 50% when coefficient is 0.5', () => {
+      expect(lighten('hsl(0, 100%, 50%)', 0.5)).to.equal('hsl(0, 100%, 75%)');
+    });
+
+    it("doesn't modify hsl colors when coefficient is 0", () => {
+      expect(lighten('hsl(0, 100%, 50%)', 0)).to.equal('hsl(0, 100%, 50%)');
+    });
+
+    it("doesn't modify hsl colors when `l` is 100%", () => {
+      expect(lighten('hsl(0, 50%, 100%)', 0.5)).to.equal('hsl(0, 50%, 100%)');
+    });
+
+  });
+});