1 files changed, 34 insertions, 0 deletions
diff --git a/date-fns/src/getDayOfYear/test.ts b/date-fns/src/getDayOfYear/test.ts
new file mode 100644
index 0000000..527c0a5
--- /dev/null
+++ b/date-fns/src/getDayOfYear/test.ts
@@ -0,0 +1,34 @@
+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import getDayOfYear from '.'
+
+describe('getDayOfYear', function() {
+  it('returns the day of the year of the given date', function() {
+    const result = getDayOfYear(new Date(2014, 6 /* Jul */, 2))
+    assert(result === 183)
+  })
+
+  it('accepts a timestamp', function() {
+    const result = getDayOfYear(new Date(2014, 0 /* Jan */, 2).getTime())
+    assert(result === 2)
+  })
+
+  it('handles dates before 100 AD', function() {
+    const initialDate = new Date(0)
+    initialDate.setFullYear(0, 11 /* Dec */, 31)
+    initialDate.setHours(0, 0, 0, 0)
+    const result = getDayOfYear(initialDate)
+    assert(result === 366)
+  })
+
+  it('returns NaN if the given date is invalid', function() {
+    const result = getDayOfYear(new Date(NaN))
+    assert(isNaN(result))
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(getDayOfYear.bind(null), TypeError)
+  })
+})