test('the last value returned does not depend on the ordering of tables in response', () => {
const respA = `#group,false,false,false,false
#datatype,string,long,dateTime:RFC3339,long
#default,1,,,
,result,table,_time,_value
,,0,2018-12-10T18:29:48Z,1
,,0,2018-12-10T18:54:18Z,2
#group,false,false,false,false
#datatype,string,long,dateTime:RFC3339,long
#default,1,,,
,result,table,_time,_value
,,1,2018-12-10T18:29:48Z,3
,,1,2018-12-10T18:40:18Z,4`
const respB = `#group,false,false,false,false
#datatype,string,long,dateTime:RFC3339,long
#default,1,,,
,result,table,_time,_value
,,0,2018-12-10T18:29:48Z,3
,,0,2018-12-10T18:40:18Z,4
#group,false,false,false,false
#datatype,string,long,dateTime:RFC3339,long
#default,1,,,
,result,table,_time,_value
,,1,2018-12-10T18:29:48Z,1
,,1,2018-12-10T18:54:18Z,2`
const latestValuesA = latestValues(fromFlux(respA).table)
const latestValuesB = latestValues(fromFlux(respB).table)
expect(latestValuesA).toEqual([2])
expect(latestValuesB).toEqual([2])
})
test('returns latest values if no time column exists but table has single row', () => {
const resp = `#group,false,false,false,false
#datatype,string,long,long,long
#default,1,,,
,result,table,_value,foo
,,0,3,4`
const result = latestValues(fromFlux(resp).table)
expect(result).toEqual([3, 4])
})
test('returns no latest values if no numeric column exists', () => {
const resp = `#group,false,false,false,false
#datatype,string,long,dateTime:RFC3339,string
#default,1,,,
,result,table,_time,_value
,,1,2018-12-10T19:00:00Z,howdy
,,1,2018-12-10T20:00:00Z,howdy`
const result = latestValues(fromFlux(resp).table)
expect(result).toEqual([])
})
test('returns no latest values if no time column exists and multiple rows', () => {
const resp = `#group,false,false,false
#datatype,string,long,long
#default,1,,
,result,table,_value
,,0,3
,,0,4`
const result = latestValues(fromFlux(resp).table)
expect(result).toEqual([])
})
test('falls back to _stop column if _time column does not exist', () => {
const resp = `#group,false,false,true,true,false
#datatype,string,long,dateTime:RFC3339,dateTime:RFC3339,long
#default,1,,,,
,result,table,_start,_stop,_value
,,0,2018-12-10T18:29:48Z,2018-12-10T18:29:48Z,3
,,0,2018-12-10T18:40:18Z,2018-12-10T18:40:18Z,4`
const result = latestValues(fromFlux(resp).table)
expect(result).toEqual([4])
})
test('uses the latest time for which a value is defined', () => {
const resp = `#group,false,false,false,false
#datatype,string,long,dateTime:RFC3339,long
#default,1,,,
,result,table,_time,_value
,,0,2018-12-10T18:29:48Z,3
,,0,2018-12-10T18:40:18Z,4
#group,false,false,false,false
#datatype,string,long,dateTime:RFC3339,string
#default,1,,,
,result,table,_time,_value
,,1,2018-12-10T19:00:00Z,howdy
,,1,2018-12-10T20:00:00Z,howdy`
const result = latestValues(fromFlux(resp).table)
expect(result).toEqual([4])
})
test('returns latest values from multiple numeric value columns', () => {
const resp = `#group,false,false,false,false,false
#datatype,string,long,dateTime:RFC3339,long,double
#default,1,,,,
,result,table,_time,_value,foo
,,0,2018-12-10T18:29:48Z,3,5.0
,,0,2018-12-10T18:40:18Z,4,6.0
#group,false,false,false,false
#datatype,string,long,dateTime:RFC3339,long,double
#default,1,,,,
,result,table,_time,_value,foo
,,0,2018-12-10T18:29:48Z,1,7.0
,,0,2018-12-10T18:40:18Z,2,8.0`
const table = fromFlux(resp).table
const result = latestValues(table)
expect(result).toEqual([4, 6.0, 2.0, 8.0])
})