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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import eachYearOfInterval from '.'
+
+describe('eachYearOfInterval', function() {
+  it('returns an array with starts of days from the day of the start date to the day of the end date', function() {
+    var result = eachYearOfInterval({
+      start: new Date(2012, 9 /* Oct */, 6),
+      end: new Date(2017, 9 /* Oct */, 12)
+    })
+    assert.deepEqual(result, [
+      new Date(2012, 0 /* Jan */, 1),
+      new Date(2013, 0 /* Jan */, 1),
+      new Date(2014, 0 /* Jan */, 1),
+      new Date(2015, 0 /* Jan */, 1),
+      new Date(2016, 0 /* Jan */, 1),
+      new Date(2017, 0 /* Jan */, 1)
+    ])
+  })
+
+  it('accepts timestamps', function() {
+    var result = eachYearOfInterval({
+      start: new Date(2012, 9 /* Oct */, 6).getTime(),
+      end: new Date(2017, 9 /* Oct */, 12).getTime()
+    })
+    assert.deepEqual(result, [
+      new Date(2012, 0 /* Jan */, 1),
+      new Date(2013, 0 /* Jan */, 1),
+      new Date(2014, 0 /* Jan */, 1),
+      new Date(2015, 0 /* Jan */, 1),
+      new Date(2016, 0 /* Jan */, 1),
+      new Date(2017, 0 /* Jan */, 1)
+    ])
+  })
+
+  it('handles the dates that are not starts of days', function() {
+    var result = eachYearOfInterval({
+      start: new Date(2012, 9 /* Oct */, 6, 6, 35),
+      end: new Date(2017, 9 /* Oct */, 12, 22, 15)
+    })
+    assert.deepEqual(result, [
+      new Date(2012, 0 /* Jan */, 1),
+      new Date(2013, 0 /* Jan */, 1),
+      new Date(2014, 0 /* Jan */, 1),
+      new Date(2015, 0 /* Jan */, 1),
+      new Date(2016, 0 /* Jan */, 1),
+      new Date(2017, 0 /* Jan */, 1)
+    ])
+  })
+
+  it('returns one year if the both arguments are on the same year', function() {
+    var result = eachYearOfInterval({
+      start: new Date(2014, 9 /* Oct */, 6, 14),
+      end: new Date(2014, 9 /* Oct */, 6, 15)
+    })
+    assert.deepEqual(result, [new Date(2014, 0 /* Jan */, 1)])
+  })
+
+  it('returns one year if the both arguments are the same', function() {
+    var result = eachYearOfInterval({
+      start: new Date(2014, 9 /* Oct */, 6, 14),
+      end: new Date(2014, 9 /* Oct */, 6, 14)
+    })
+    assert.deepEqual(result, [new Date(2014, 0 /* Jan */, 1)])
+  })
+
+  it('throws an exception if the start date is after the end date', function() {
+    var block = eachYearOfInterval.bind(null, {
+      start: new Date(2014, 9 /* Oct */, 12),
+      end: new Date(2014, 9 /* Oct */, 6)
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws an exception if the start date is `Invalid Date`', function() {
+    var block = eachYearOfInterval.bind(null, {
+      start: new Date(NaN),
+      end: new Date(2014, 9 /* Oct */, 6)
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws an exception if the end date is `Invalid Date`', function() {
+    var block = eachYearOfInterval.bind(null, {
+      start: new Date(2014, 9 /* Oct */, 12),
+      end: new Date(NaN)
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws an exception if the interval is undefined', function() {
+    var block = eachYearOfInterval.bind(
+      null,
+      // $ExpectedMistake
+      undefined
+    )
+    assert.throws(block, RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(eachYearOfInterval.bind(null), TypeError)
+  })
+})