1 files changed, 36 insertions, 0 deletions
diff --git a/date-fns/src/_lib/getUTCDayOfYear/test.js b/date-fns/src/_lib/getUTCDayOfYear/test.js
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+++ b/date-fns/src/_lib/getUTCDayOfYear/test.js
@@ -0,0 +1,36 @@
+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import getUTCDayOfYear from '.'
+
+describe('getUTCDayOfYear', function() {
+  it('returns the day of the year of the given date', function() {
+    var result = getUTCDayOfYear(new Date(Date.UTC(2014, 6 /* Jul */, 2)))
+    assert(result === 183)
+  })
+
+  it('accepts a timestamp', function() {
+    var result = getUTCDayOfYear(
+      new Date(Date.UTC(2014, 0 /* Jan */, 2)).getTime()
+    )
+    assert(result === 2)
+  })
+
+  it('handles dates before 100 AD', function() {
+    var initialDate = new Date(0)
+    initialDate.setUTCFullYear(0, 11 /* Dec */, 31)
+    initialDate.setUTCHours(0, 0, 0, 0)
+    var result = getUTCDayOfYear(initialDate)
+    assert(result === 366)
+  })
+
+  it('returns NaN if the given date is invalid', function() {
+    var result = getUTCDayOfYear(new Date(NaN))
+    assert(isNaN(result))
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(getUTCDayOfYear.bind(null), TypeError)
+  })
+})