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diff --git a/date-fns/src/_lib/isSameUTCWeek/test.js b/date-fns/src/_lib/isSameUTCWeek/test.js
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import isSameUTCWeek from '.'
+
+describe('isSameUTCWeek', function() {
+  it('returns true if the given dates have the same week', function() {
+    var result = isSameUTCWeek(
+      new Date(Date.UTC(2014, 7 /* Aug */, 31)),
+      new Date(Date.UTC(2014, 8 /* Sep */, 4))
+    )
+    assert(result === true)
+  })
+
+  it('returns false if the given dates have different weeks', function() {
+    var result = isSameUTCWeek(
+      new Date(Date.UTC(2014, 7 /* Aug */, 30)),
+      new Date(Date.UTC(2014, 8 /* Sep */, 4))
+    )
+    assert(result === false)
+  })
+
+  it('allows to specify which day is the first day of the week', function() {
+    var result = isSameUTCWeek(
+      new Date(Date.UTC(2014, 7 /* Aug */, 31)),
+      new Date(Date.UTC(2014, 8 /* Sep */, 4)),
+      { weekStartsOn: 1 }
+    )
+    assert(result === false)
+  })
+
+  it('allows to specify which day is the first day of the week in locale', function() {
+    var result = isSameUTCWeek(
+      new Date(Date.UTC(2014, 7 /* Aug */, 31)),
+      new Date(Date.UTC(2014, 8 /* Sep */, 4)),
+      {
+        locale: {
+          options: { weekStartsOn: 1 }
+        }
+      }
+    )
+    assert(result === false)
+  })
+
+  it('`options.weekStartsOn` overwrites the first day of the week specified in locale', function() {
+    var result = isSameUTCWeek(
+      new Date(Date.UTC(2014, 7 /* Aug */, 31)),
+      new Date(Date.UTC(2014, 8 /* Sep */, 4)),
+      {
+        weekStartsOn: 1,
+        locale: {
+          options: { weekStartsOn: 0 }
+        }
+      }
+    )
+    assert(result === false)
+  })
+
+  it('implicitly converts options', function() {
+    var result = isSameUTCWeek(
+      new Date(Date.UTC(2014, 7 /* Aug */, 31)),
+      new Date(Date.UTC(2014, 8 /* Sep */, 4)),
+      { weekStartsOn: '1' }
+    )
+    assert(result === false)
+  })
+
+  it('accepts a timestamp', function() {
+    var result = isSameUTCWeek(
+      Date.UTC(2014, 7 /* Aug */, 31),
+      Date.UTC(2014, 8 /* Sep */, 4)
+    )
+    assert(result === true)
+  })
+
+  it('returns false if the first date is `Invalid Date`', function() {
+    var result = isSameUTCWeek(
+      new Date(NaN),
+      new Date(Date.UTC(1989, 6 /* Jul */, 10))
+    )
+    assert(result === false)
+  })
+
+  it('returns false if the second date is `Invalid Date`', function() {
+    var result = isSameUTCWeek(
+      new Date(Date.UTC(1987, 1 /* Feb */, 11)),
+      new Date(NaN)
+    )
+    assert(result === false)
+  })
+
+  it('returns false if the both dates are `Invalid Date`', function() {
+    var result = isSameUTCWeek(new Date(NaN), new Date(NaN))
+    assert(result === false)
+  })
+
+  it('throws `RangeError` if `options.weekStartsOn` is not convertable to 0, 1, ..., 6 or undefined', function() {
+    var block = isSameUTCWeek.bind(
+      null,
+      new Date(Date.UTC(2014, 7 /* Aug */, 31)),
+      new Date(Date.UTC(2014, 8 /* Sep */, 4)),
+      { weekStartsOn: NaN }
+    )
+    assert.throws(block, RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function() {
+    assert.throws(isSameUTCWeek.bind(null, 1), TypeError)
+  })
+})