1 files changed, 80 insertions, 0 deletions
diff --git a/date-fns/src/formatDuration/test.js b/date-fns/src/formatDuration/test.js
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+++ b/date-fns/src/formatDuration/test.js
@@ -0,0 +1,80 @@
+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import formatDuration from '.'
+
+describe('formatDuration', () => {
+  it('formats full duration', () => {
+    assert(
+      formatDuration({
+        years: 2,
+        months: 9,
+        weeks: 1,
+        days: 7,
+        hours: 5,
+        minutes: 9,
+        seconds: 30
+      }) === '2 years 9 months 1 week 7 days 5 hours 9 minutes 30 seconds'
+    )
+  })
+
+  it('formats partial duration', () => {
+    assert(formatDuration({ months: 9, days: 2 }) === '9 months 2 days')
+  })
+
+  it('allows to customize the format', () => {
+    assert(
+      formatDuration(
+        {
+          years: 2,
+          months: 9,
+          weeks: 1,
+          days: 7,
+          hours: 5,
+          minutes: 9,
+          seconds: 30
+        },
+        { format: ['months', 'weeks'] }
+      ) === '9 months 1 week'
+    )
+  })
+
+  it('does not include zeros by default', () => {
+    assert(
+      formatDuration({
+        years: 0,
+        months: 0,
+        weeks: 1,
+        days: 0,
+        hours: 0,
+        minutes: 0,
+        seconds: 0
+      }) === '1 week'
+    )
+  })
+
+  it('allows to include zeros', () => {
+    assert(
+      formatDuration(
+        {
+          years: 0,
+          months: 0,
+          weeks: 1,
+          days: 0,
+          hours: 0,
+          minutes: 0,
+          seconds: 0
+        },
+        { zero: true }
+      ) === '0 years 0 months 1 week 0 days 0 hours 0 minutes 0 seconds'
+    )
+  })
+
+  it('allows to customize the delimiter', () => {
+    assert(
+      formatDuration({ months: 9, days: 2 }, { delimiter: ', ' }) ===
+        '9 months, 2 days'
+    )
+  })
+})