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variants.test.ts
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// @ts-nocheck
import test from 'ava';
import { selectVariant } from '../variant';
function genVariants(n) {
return Array.from(new Array(n)).map((v, i) => ({
name: `variant${i + 1}`,
payload: {
type: 'string',
value: '',
},
weight: 1,
}));
}
function createFeature(variants) {
return {
name: 'toggleName',
enabled: true,
strategies: [],
variants: variants || [],
};
}
test('selectVariant should return null', (t) => {
const variant = selectVariant(createFeature(), {
toggleName: 'toggleName',
userId: 'a',
});
t.true(variant === null);
});
test('selectVariant should select on 1 variant', (t) => {
const variant = selectVariant(createFeature(genVariants(1)), {
toggleName: 'toggleName',
userId: 'a',
});
t.true(variant.name === 'variant1');
});
test('selectVariant should select on 2 variants', (t) => {
const feature = createFeature(genVariants(2));
const variant = selectVariant(feature, { toggleName: 'toggleName', userId: 'a' });
t.true(variant.name === 'variant1');
const variant2 = selectVariant(feature, { toggleName: 'toggleName', userId: '0' });
t.true(variant2.name === 'variant2');
});
test('selectVariant should use variant stickiness when specified to select variant', (t) => {
const variants = genVariants(2).map((v) => ({ ...v, stickiness: 'someField' }));
const feature = createFeature(variants);
const variant = selectVariant(feature, { someField: 'a' });
t.true(variant.name === 'variant1');
const variant2 = selectVariant(feature, { someField: '0' });
t.true(variant2.name === 'variant2');
});
test('selectVariant should use variant stickiness for many variants', (t) => {
const variants = genVariants(4).map((v) => ({ ...v, stickiness: 'organization', weight: 25 }));
const feature = createFeature(variants);
const variant = selectVariant(feature, { organization: '1430' });
t.is(variant.name, 'variant1');
const variant2 = selectVariant(feature, { organization: '125' });
t.is(variant2.name, 'variant2');
const variant3 = selectVariant(feature, { organization: '930' });
t.is(variant3.name, 'variant3');
const variant4 = selectVariant(feature, { organization: '381' });
t.is(variant4.name, 'variant4');
});
test('selectVariant should select on 3 variants', (t) => {
const feature = createFeature(genVariants(3));
const variant = selectVariant(feature, { toggleName: 'toggleName', userId: '0' });
t.true(variant.name === 'variant1');
const variant2 = selectVariant(feature, { toggleName: 'toggleName', userId: 'zxa' });
t.true(variant2.name === 'variant2');
const variant3 = selectVariant(feature, { toggleName: 'toggleName', userId: 'ya' });
t.true(variant3.name === 'variant3');
});
test('selectVariant should use variant overrides', (t) => {
const variants = genVariants(3);
variants[0].overrides = [
{
contextName: 'userId',
values: ['z'],
},
];
const feature = createFeature(variants);
const variant1 = selectVariant(feature, { toggleName: 'toggleName', userId: 'z' });
t.is(variant1.name, 'variant1');
});
test('selectVariant should use *first* variant override', (t) => {
const variants = genVariants(3);
variants[0].overrides = [
{
contextName: 'userId',
values: ['z', 'b'],
},
];
variants[1].overrides = [
{
contextName: 'userId',
values: ['z'],
},
];
const feature = createFeature(variants);
const variant1 = selectVariant(feature, { toggleName: 'toggleName', userId: 'z' });
t.is(variant1.name, 'variant1');
});
test('selectVariant should use *first* variant override for userId=132', (t) => {
const featureToggle = {
name: 'Feature.Variants.override.D',
description: 'Variant with overrides',
enabled: true,
strategies: [],
variants: [
{
name: 'variant1',
weight: 33,
payload: {
type: 'string',
value: 'val1',
},
overrides: [
{
contextName: 'userId',
values: ['132', '61'],
},
],
},
{
name: 'variant2',
weight: 33,
payload: {
type: 'string',
value: 'val2',
},
},
{
name: 'variant3',
weight: 34,
payload: {
type: 'string',
value: 'val3',
},
},
],
};
const variant1 = selectVariant(featureToggle, { userId: '132' });
t.is(variant1.name, 'variant1');
});