Improve testing on resultsToCSV

ui/spec/shared/parsing/resultsToCSVSpec.js

@@ -1,4 +1,4 @@
-import resultsToCSV from 'shared/parsing/resultsToCSV'
+import resultsToCSV, {formatDate} from 'shared/parsing/resultsToCSV'
 
 describe('resultsToCSV', () => {
   it('parses results to an object with name and CSVString keys', () => {
@@ -8,18 +8,27 @@ describe('resultsToCSV', () => {
           {
             name: 'some_name',
             columns: ['col1', 'col2', 'col3', 'col4'],
-            values: [[1, 2, 3, 4], [(5, 6, 7, 8)]],
+            values: [[1000000000, '2', 3, 4], [2000000000, '6', 7, 8]],
           },
         ],
       },
     ]
     const response = resultsToCSV(results)
+    const expected = `date,col2,col3,col4\n${formatDate(
+      1000000000
+    )},2,3,4\n${formatDate(2000000000)},6,7,8`
     expect(response).to.have.all.keys('name', 'CSVString')
     expect(response.name).to.be.a('string')
-    expect('foobar').to.not.include('/')
     expect(response.CSVString).to.be.a('string')
+    expect(response.CSVString).to.equal(expected)
   })
 })
 
-// make sure name does not contain things that would not be allowed in a filename.
-// handle edge cases for columns and values. ?
+describe('formatDate', () => {
+  it('converts timestamp to an excel compatible date string', () => {
+    const timestamp = 1000000000000
+    const result = formatDate(timestamp)
+    expect(result).to.be.a('string')
+    expect(+new Date(result)).to.equal(timestamp)
+  })
+})

ui/src/shared/parsing/resultsToCSV.js

@@ -1,6 +1,9 @@
 import _ from 'lodash'
 import moment from 'moment'
 
+export const formatDate = timestamp =>
+  moment(timestamp).format('M/D/YYYY h:mm:ss A')
+
 const resultsToCSV = results => {
   const {name, columns, values} = _.get(results, ['0', 'series', '0'], {})
   const [, ...cols] = columns
@@ -9,9 +12,7 @@ const resultsToCSV = results => {
     .concat(
       values.map(([timestamp, ...measurements]) =>
         // MS Excel format
-        [moment(timestamp).format('M/D/YYYY h:mm:ss A'), ...measurements].join(
-          ','
-        )
+        [formatDate(timestamp), ...measurements].join(',')
       )
     )
     .join('\n')