1 files changed, 42 insertions, 0 deletions
diff --git a/date-fns/src/getDaysInYear/test.ts b/date-fns/src/getDaysInYear/test.ts
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+++ b/date-fns/src/getDaysInYear/test.ts
@@ -0,0 +1,42 @@
+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import getDaysInYear from '.'
+
+describe('getDaysInYear', function() {
+  it('returns the number of days in the year of the given date', function() {
+    const result = getDaysInYear(new Date(2014, 6 /* Jul */, 2))
+    assert(result === 365)
+  })
+
+  it('works for a leap year', function() {
+    const result = getDaysInYear(new Date(2012, 6 /* Jul */, 2))
+    assert(result === 366)
+  })
+
+  it('works for the years divisible by 100 but not by 400', function() {
+    const result = getDaysInYear(new Date(2100, 6 /* Jul */, 2))
+    assert(result === 365)
+  })
+
+  it('works for the years divisible by 400', function() {
+    const result = getDaysInYear(new Date(2000, 6 /* Jul */, 2))
+    assert(result === 366)
+  })
+
+  it('accepts a timestamp', function() {
+    const date = new Date(2012, 6 /* Jul */, 2).getTime()
+    const result = getDaysInYear(date)
+    assert(result === 366)
+  })
+
+  it('returns NaN if the given date is invalid', function() {
+    const result = getDaysInYear(new Date(NaN))
+    assert(isNaN(result))
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(getDaysInYear.bind(null), TypeError)
+  })
+})