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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| import { expect } from 'chai'; | ||
| import sinon from 'sinon'; | ||
| import { getFeatureFlags, getFeatureFlagsString, isFeatureFlagPresent } from './feature-flag-utils'; | ||
|
|
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| describe('getFeatureFlagsString', () => { | ||
| describe('returns the env var `FEATURE_FLAGS`', () => { | ||
| const env = Object.assign({}, process.env); | ||
|
|
||
| afterEach(() => { | ||
| sinon.restore(); | ||
| process.env = env; | ||
| }); | ||
|
|
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| it('when the FEATURE_FLAGS env var is undefined', () => { | ||
| process.env.FEATURE_FLAGS = undefined; | ||
|
|
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| expect(getFeatureFlagsString()).to.equal(undefined); | ||
| }); | ||
|
|
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| it('when the FEATURE_FLAGS env var is defined', () => { | ||
| process.env.FEATURE_FLAGS = 'flag1,flag2,flag3'; | ||
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|
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| expect(getFeatureFlagsString()).to.equal('flag1,flag2,flag3'); | ||
| }); | ||
| }); | ||
| }); | ||
|
|
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| describe('getFeatureFlags', () => { | ||
| describe('returns an array of flags', () => { | ||
| const env = Object.assign({}, process.env); | ||
|
|
||
| afterEach(() => { | ||
| sinon.restore(); | ||
| process.env = env; | ||
| }); | ||
|
|
||
| it('when the FEATURE_FLAGS env var is undefined', () => { | ||
| process.env.FEATURE_FLAGS = undefined; | ||
|
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| expect(getFeatureFlags()).to.eql([]); | ||
| }); | ||
|
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| it('when the FEATURE_FLAGS env var is defined', () => { | ||
| process.env.FEATURE_FLAGS = 'flag1,flag2,flag3'; | ||
|
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| expect(getFeatureFlags()).to.eql(['flag1', 'flag2', 'flag3']); | ||
| }); | ||
| }); | ||
| }); | ||
|
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| describe('isFeatureFlagPresent', () => { | ||
| describe('returns true', () => { | ||
| const env = Object.assign({}, process.env); | ||
|
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| afterEach(() => { | ||
| sinon.restore(); | ||
| process.env = env; | ||
| }); | ||
|
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| it('when one flag matches', () => { | ||
| process.env.FEATURE_FLAGS = 'flag1,flag2,flag3'; | ||
|
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| expect(isFeatureFlagPresent(['flag2'])).to.equal(true); | ||
| }); | ||
|
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| it('when two flags match', () => { | ||
| process.env.FEATURE_FLAGS = 'flag1,flag2,flag3'; | ||
|
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| expect(isFeatureFlagPresent(['flag2', 'flag1'])).to.equal(true); | ||
| }); | ||
|
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| it('when some, but not all, flags match', () => { | ||
| process.env.FEATURE_FLAGS = 'flag1,flag2,flag3'; | ||
|
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| expect(isFeatureFlagPresent(['flag4', 'flag3'])).to.equal(true); | ||
| }); | ||
| }); | ||
|
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| describe('returns false', () => { | ||
| const env = Object.assign({}, process.env); | ||
|
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||
| afterEach(() => { | ||
| sinon.restore(); | ||
| process.env = env; | ||
| }); | ||
|
|
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| it('when no flags match', () => { | ||
| process.env.FEATURE_FLAGS = 'flag1,flag2,flag3'; | ||
|
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| expect(isFeatureFlagPresent(['flag4'])).to.equal(false); | ||
| }); | ||
|
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| it('when no flags specified', () => { | ||
| process.env.FEATURE_FLAGS = 'flag1,flag2,flag3'; | ||
|
|
||
| expect(isFeatureFlagPresent([])).to.equal(false); | ||
| }); | ||
| }); | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| /** | ||
| * Returns the raw feature flag string from the environment variable `REACT_APP_FEATURE_FLAGS`. | ||
| * | ||
| * @return {*} {(string | undefined)} | ||
| */ | ||
| export const getFeatureFlagsString = (): string | undefined => { | ||
| return process.env.FEATURE_FLAGS; | ||
| }; | ||
|
|
||
| /** | ||
| * Returns a parsed array of feature flag strings from the environment variable `REACT_APP_FEATURE_FLAGS`. | ||
| * | ||
| * @return {*} {string[]} | ||
| */ | ||
| export const getFeatureFlags = (): string[] => { | ||
| const featureFlagsString = getFeatureFlagsString(); | ||
|
|
||
| if (!featureFlagsString) { | ||
| return []; | ||
| } | ||
|
|
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| return featureFlagsString.split(','); | ||
| }; | ||
|
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| /** | ||
| * Returns `true` if at least one of the provided `featureFlags` is present in the environment variable | ||
| * `REACT_APP_FEATURE_FLAGS`. | ||
| * | ||
| * @param {string[]} featureFlags | ||
| * @return {*} {boolean} | ||
| */ | ||
| export const isFeatureFlagPresent = (featureFlags: string[]): boolean => { | ||
| return getFeatureFlags().some((flag) => featureFlags.includes(flag)); | ||
| }; |
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