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diff --git a/date-fns/src/subBusinessDays/test.js b/date-fns/src/subBusinessDays/test.js
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import subBusinessDays from '.'
+
+describe('subBusinessDays', function() {
+  it('substract the given number of business days', function() {
+    const result = subBusinessDays(new Date(2014, 8 /* Sep */, 1), 10)
+    assert.deepEqual(result, new Date(2014, 7 /* Aug */, 18))
+  })
+
+  it('handles negative amount', function() {
+    var result = subBusinessDays(new Date(2014, 7 /* Sep */, 18), -10)
+    assert.deepEqual(result, new Date(2014, 8 /* Sep */, 1))
+  })
+
+  it('can handle a large number of business days', function() {
+    if (typeof this.timeout === 'function') {
+      this.timeout(500 /* 500 ms test timeout */)
+    }
+
+    var result = subBusinessDays(new Date(15000, 0 /* Jan */, 1), 3387885)
+    assert.deepEqual(result, new Date(2014, 0 /* Jan */, 1))
+  })
+
+  it('accepts a timestamp', function() {
+    var result = subBusinessDays(new Date(2014, 8 /* Sep */, 1).getTime(), 10)
+    assert.deepEqual(result, new Date(2014, 7 /* Aug */, 18))
+  })
+
+  it('converts a fractional number to an integer', function() {
+    var result = subBusinessDays(new Date(2014, 8 /* Sep */, 1), 10.5)
+    assert.deepEqual(result, new Date(2014, 7 /* Aug */, 18))
+  })
+
+  it('implicitly converts number arguments', function() {
+    // $ExpectedMistake
+    var result = subBusinessDays(new Date(2014, 8 /* Sep */, 1), '10')
+    assert.deepEqual(result, new Date(2014, 7 /* Aug */, 18))
+  })
+
+  it('does not mutate the original date', function() {
+    var date = new Date(2014, 8 /* Sep */, 1)
+    subBusinessDays(date, 11)
+    assert.deepEqual(date, new Date(2014, 8 /* Sep */, 1))
+  })
+
+  it('returns `Invalid Date` if the given date is invalid', function() {
+    var result = subBusinessDays(new Date(NaN), 10)
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('returns `Invalid Date` if the given amount is NaN', function() {
+    var result = subBusinessDays(new Date(2014, 8 /* Sep */, 1), NaN)
+    assert(result instanceof Date && isNaN(result))
+  })
+
+  it('throws TypeError exception if passed less than 2 arguments', function() {
+    assert.throws(subBusinessDays.bind(null), TypeError)
+    assert.throws(subBusinessDays.bind(null, 1), TypeError)
+  })
+})