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ui/src/utils/format-date-relative.unit.js

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+import formatDateRelative from './format-date-relative'
+
+describe('@utils/format-date-relative', () => {
+  it('correctly compares dates years apart', () => {
+    const fromDate = new Date(2002, 5, 1)
+    const toDate = new Date(2017, 4, 10)
+    const timeAgoInWords = formatDateRelative(fromDate, toDate)
+    expect(timeAgoInWords).toEqual('almost 15 years')
+  })
+
+  it('correctly compares dates months apart', () => {
+    const fromDate = new Date(2017, 8, 1)
+    const toDate = new Date(2017, 11, 10)
+    const timeAgoInWords = formatDateRelative(fromDate, toDate)
+    expect(timeAgoInWords).toEqual('3 months')
+  })
+
+  it('correctly compares dates days apart', () => {
+    const fromDate = new Date(2017, 11, 1)
+    const toDate = new Date(2017, 11, 10)
+    const timeAgoInWords = formatDateRelative(fromDate, toDate)
+    expect(timeAgoInWords).toEqual('9 days')
+  })
+
+  it('compares to now when passed only one date', () => {
+    const fromDate = new Date(2010, 11, 1)
+    const timeAgoInWords = formatDateRelative(fromDate)
+    expect(timeAgoInWords).toContain('years ago')
+  })
+})