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import {
getAverageByMonth,
getEarliestDate,
generateDataKeys,
} from '~/analytics/usage_trends/utils';
import {
mockCountsData1,
mockCountsData2,
countsMonthlyChartData1,
countsMonthlyChartData2,
} from './mock_data';
describe('getAverageByMonth', () => {
it('collects data into average by months', () => {
expect(getAverageByMonth(mockCountsData1)).toStrictEqual(countsMonthlyChartData1);
expect(getAverageByMonth(mockCountsData2)).toStrictEqual(countsMonthlyChartData2);
});
it('it transforms a data point to the first of the month', () => {
const item = mockCountsData1[0];
const firstOfTheMonth = item.recordedAt.replace(/-[0-9]{2}$/, '-01');
expect(getAverageByMonth([item])).toStrictEqual([[firstOfTheMonth, item.count]]);
});
it('it uses sane defaults', () => {
expect(getAverageByMonth()).toStrictEqual([]);
});
it('it errors when passing null', () => {
expect(() => {
getAverageByMonth(null);
}).toThrow();
});
describe('when shouldRound = true', () => {
const options = { shouldRound: true };
it('rounds the averages', () => {
const roundedData1 = countsMonthlyChartData1.map(([date, avg]) => [date, Math.round(avg)]);
const roundedData2 = countsMonthlyChartData2.map(([date, avg]) => [date, Math.round(avg)]);
expect(getAverageByMonth(mockCountsData1, options)).toStrictEqual(roundedData1);
expect(getAverageByMonth(mockCountsData2, options)).toStrictEqual(roundedData2);
});
});
});
describe('getEarliestDate', () => {
it('returns the date of the final item in the array', () => {
expect(getEarliestDate(mockCountsData1)).toBe('2020-06-12');
});
it('returns null for an empty array', () => {
expect(getEarliestDate([])).toBeNull();
});
it("returns null if the array has data but `recordedAt` isn't defined", () => {
expect(
getEarliestDate(mockCountsData1.map(({ recordedAt: date, ...rest }) => ({ date, ...rest }))),
).toBeNull();
});
});
describe('generateDataKeys', () => {
const fakeQueries = [
{ identifier: 'from' },
{ identifier: 'first' },
{ identifier: 'to' },
{ identifier: 'last' },
];
const defaultValue = 'default value';
const res = generateDataKeys(fakeQueries, defaultValue);
it('extracts each query identifier and sets them as object keys', () => {
expect(Object.keys(res)).toEqual(['from', 'first', 'to', 'last']);
});
it('sets every value to the `defaultValue` provided', () => {
expect(Object.values(res)).toEqual(Array(fakeQueries.length).fill(defaultValue));
});
});
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