1 files changed, 70 insertions, 0 deletions
diff --git a/date-fns/src/_lib/getUTCWeekYear/test.js b/date-fns/src/_lib/getUTCWeekYear/test.js
new file mode 100644
index 0000000..3b45fc4
--- /dev/null
+++ b/date-fns/src/_lib/getUTCWeekYear/test.js
@@ -0,0 +1,70 @@
+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import getUTCWeekYear from '.'
+
+describe('getUTCWeekYear', function() {
+  it('returns the local week-numbering year of the given date', function() {
+    var result = getUTCWeekYear(new Date(Date.UTC(2004, 11 /* Dec */, 26)))
+    assert(result === 2005)
+  })
+
+  it('accepts a timestamp', function() {
+    var result = getUTCWeekYear(Date.UTC(2000, 11 /* Dec */, 30))
+    assert(result === 2000)
+  })
+
+  it('handles dates before 100 AD', function() {
+    var initialDate = new Date(0)
+    initialDate.setUTCFullYear(7, 11 /* Dec */, 31)
+    initialDate.setUTCHours(0, 0, 0, 0)
+    var result = getUTCWeekYear(initialDate)
+    assert(result === 8)
+  })
+
+  it('returns NaN if the given date is invalid', function() {
+    var result = getUTCWeekYear(new Date(NaN))
+    assert(isNaN(result))
+  })
+
+  it('allows to specify `weekStartsOn` and `firstWeekContainsDate` in locale', function() {
+    var date = new Date(Date.UTC(2004, 11 /* Dec */, 26))
+    var result = getUTCWeekYear(date, {
+      locale: {
+        options: { weekStartsOn: 1, firstWeekContainsDate: 4 }
+      }
+    })
+    assert(result === 2004)
+  })
+
+  it('`options.weekStartsOn` overwrites the first day of the week specified in locale', function() {
+    var date = new Date(Date.UTC(2004, 11 /* Dec */, 26))
+    var result = getUTCWeekYear(date, {
+      weekStartsOn: 1,
+      firstWeekContainsDate: 4,
+      locale: {
+        options: { weekStartsOn: 0, firstWeekContainsDate: 1 }
+      }
+    })
+    assert(result === 2004)
+  })
+
+  it('throws `RangeError` if `options.weekStartsOn` is not convertable to 0, 1, ..., 6 or undefined', function() {
+    var block = getUTCWeekYear.bind(null, new Date(2007, 11 /* Dec */, 31), {
+      weekStartsOn: NaN
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws `RangeError` if `options.firstWeekContainsDate` is not convertable to 1, 2, ..., 7 or undefined', function() {
+    var block = getUTCWeekYear.bind(null, new Date(2007, 11 /* Dec */, 31), {
+      firstWeekContainsDate: NaN
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(getUTCWeekYear.bind(null), TypeError)
+  })
+})