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diff --git a/date-fns/src/eachWeekendOfInterval/test.ts b/date-fns/src/eachWeekendOfInterval/test.ts
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+++ b/date-fns/src/eachWeekendOfInterval/test.ts
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'assert'
+import eachWeekendOfInterval from '.'
+
+describe('eachWeekendOfInterval', function () {
+  it('returns all weekends within the interval', function () {
+    const result = eachWeekendOfInterval({
+      start: new Date(2018, 8 /* Sept */, 17),
+      end: new Date(2018, 8 /* Sept */, 30)
+    })
+    assert.deepEqual(result, [
+      new Date(2018, 8 /* Sept */, 22),
+      new Date(2018, 8 /* Sept */, 23),
+      new Date(2018, 8 /* Sept */, 29),
+      new Date(2018, 8 /* Sept */, 30)
+    ])
+  })
+
+  it('returns all weekends within the interval when starting on a weekend', function () {
+    const result = eachWeekendOfInterval({
+      start: new Date(2018, 8 /* Sept */, 22),
+      end: new Date(2018, 8 /* Sept */, 30)
+    })
+    assert.deepEqual(result, [
+      new Date(2018, 8 /* Sept */, 22),
+      new Date(2018, 8 /* Sept */, 23),
+      new Date(2018, 8 /* Sept */, 29),
+      new Date(2018, 8 /* Sept */, 30)
+    ])
+  })
+
+  it('throws `RangeError` invalid interval start date is used', function () {
+    // $ExpectedMistake
+    const block = eachWeekendOfInterval.bind(null, {
+      start: new Date(NaN),
+      end: new Date(2019, 11 /* Dec */, 31)
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws `RangeError` invalid interval end date is used', function () {
+    // $ExpectedMistake
+    const block = eachWeekendOfInterval.bind(null, {
+      start: new Date(2019, 0 /* Jan */, 1),
+      end: new Date(NaN)
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', function () {
+    assert.throws(eachWeekendOfInterval, TypeError)
+  })
+
+  it('throws `RangeError` if start of an interval is after its end', function () {
+    const block = eachWeekendOfInterval.bind(
+      null,
+      // $ExpectedMistake
+      {
+        start: new Date(2018, 8 /* Sept */, 25),
+        end: new Date(2018, 8 /* Sept */, 6)
+      }
+    )
+    assert.throws(block, RangeError)
+  })
+})