@@ -252,6 +252,80 @@ describe('CalendarInterval', () => {
252252 } ) ;
253253 } ) ;
254254
255+ describe ( 'getPrevious' , ( ) => {
256+ it ( 'returns 1st of previous month when month start is 1' , ( ) => {
257+ clock = sinon . useFakeTimers ( moment ( '2024-07-15 21:10:01' ) . valueOf ( ) ) ;
258+ chai . expect ( service . getPrevious ( 1 ) ) . to . deep . equal ( {
259+ start : moment ( '2024-06-01 00:00:00' ) . valueOf ( ) ,
260+ end : moment ( '2024-06-30 23:59:59:999' ) . valueOf ( ) ,
261+ } ) ;
262+ clock . restore ( ) ;
263+ } ) ;
264+
265+ it ( 'returns 1st of previous month when reference date is provided' , ( ) => {
266+ const referenceDate = '2024-07-15' ;
267+ chai . expect ( service . getPrevious ( 1 , referenceDate ) ) . to . deep . equal ( {
268+ start : moment ( '2024-06-01 00:00:00' ) . valueOf ( ) ,
269+ end : moment ( '2024-06-30 23:59:59:999' ) . valueOf ( ) ,
270+ } ) ;
271+ } ) ;
272+
273+ it ( 'returns 1st of previous month when reference date provided is in the future' , ( ) => {
274+ const referenceDate = '2025-07-15' ;
275+ chai . expect ( service . getPrevious ( 1 , referenceDate ) ) . to . deep . equal ( {
276+ start : moment ( '2025-06-01 00:00:00' ) . valueOf ( ) ,
277+ end : moment ( '2025-06-30 23:59:59:999' ) . valueOf ( ) ,
278+ } ) ;
279+ } ) ;
280+
281+ it ( 'returns n-th of the previous month when month start is n <= current date' , ( ) => {
282+ clock = sinon . useFakeTimers ( moment ( '2018-03-20 21:10:01' ) . valueOf ( ) ) ;
283+ chai . expect ( service . getPrevious ( 15 ) ) . to . deep . equal ( {
284+ start : moment ( '2018-02-15 00:00:00' ) . valueOf ( ) ,
285+ end : moment ( '2018-03-14 23:59:59:999' ) . valueOf ( ) ,
286+ } ) ;
287+ clock . restore ( ) ;
288+ } ) ;
289+
290+ it ( 'returns n-th of two months ago when month start is n > current date' , ( ) => {
291+ clock = sinon . useFakeTimers ( moment ( '2018-03-10 21:10:01' ) . valueOf ( ) ) ;
292+ chai . expect ( service . getPrevious ( 20 ) ) . to . deep . equal ( {
293+ start : moment ( '2018-01-20 00:00:00' ) . valueOf ( ) ,
294+ end : moment ( '2018-02-19 23:59:59:999' ) . valueOf ( ) ,
295+ } ) ;
296+ clock . restore ( ) ;
297+ } ) ;
298+
299+ it ( 'returns correct previous period when incorrect start date values' , ( ) => {
300+ clock = sinon . useFakeTimers ( moment ( '2018-02-10' ) . valueOf ( ) ) ;
301+ [ null , undefined , - 1 , 'date' , false , 0 , 35 ] . forEach ( ( invalidStart ) => {
302+ chai . expect ( service . getPrevious ( invalidStart ) ) . to . deep . equal ( {
303+ start : moment ( '2018-01-01 00:00:00' ) . valueOf ( ) ,
304+ end : moment ( '2018-01-31 23:59:59:999' ) . valueOf ( ) ,
305+ } ) ;
306+ } ) ;
307+ clock . restore ( ) ;
308+ } ) ;
309+
310+ it ( 'returns correct previous period when start date same as current date' , ( ) => {
311+ clock = sinon . useFakeTimers ( moment ( '2018-04-15' ) . valueOf ( ) ) ;
312+ chai . expect ( service . getPrevious ( 15 ) ) . to . deep . equal ( {
313+ start : moment ( '2018-03-15 00:00:00' ) . valueOf ( ) ,
314+ end : moment ( '2018-04-14 23:59:59:999' ) . valueOf ( ) ,
315+ } ) ;
316+ clock . restore ( ) ;
317+ } ) ;
318+
319+ it ( 'returns correct start date in previous month if month has 30 days' , ( ) => {
320+ clock = sinon . useFakeTimers ( moment ( '2018-05-15' ) . valueOf ( ) ) ;
321+ chai . expect ( service . getPrevious ( 31 ) ) . to . deep . equal ( {
322+ start : moment ( '2018-03-31 00:00:00' ) . valueOf ( ) ,
323+ end : moment ( '2018-04-30 23:59:59:999' ) . valueOf ( ) ,
324+ } ) ;
325+ clock . restore ( ) ;
326+ } ) ;
327+ } ) ;
328+
255329 describe ( 'getInterval' , ( ) => {
256330 it ( 'returns 1st of current month when month start is not set or incorrect' , ( ) => {
257331 let timestamp ;
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