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diff --git a/date-fns/src/getWeekYear/test.ts b/date-fns/src/getWeekYear/test.ts
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+++ b/date-fns/src/getWeekYear/test.ts
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+// @flow
+/* eslint-env mocha */
+
+import assert from 'assert'
+import getWeekYear from '.'
+
+describe('getWeekYear', () => {
+  it('returns the local week-numbering year of the given date', () => {
+    const result = getWeekYear(new Date(2004, 11 /* Dec */, 26))
+    assert(result === 2005)
+  })
+
+  it('accepts a timestamp', () => {
+    const result = getWeekYear(new Date(2000, 11 /* Dec */, 30).getTime())
+    assert(result === 2000)
+  })
+
+  it('handles dates before 100 AD', () => {
+    const initialDate = new Date(0)
+    initialDate.setFullYear(7, 11 /* Dec */, 31)
+    initialDate.setHours(0, 0, 0, 0)
+    const result = getWeekYear(initialDate)
+    assert(result === 8)
+  })
+
+  it('returns NaN if the given date is invalid', () => {
+    const result = getWeekYear(new Date(NaN))
+    assert(isNaN(result))
+  })
+
+  it('allows to specify `weekStartsOn` and `firstWeekContainsDate` in locale', () => {
+    const date = new Date(2004, 11 /* Dec */, 26)
+    const result = getWeekYear(date, {
+      // @ts-expect-error
+      locale: {
+        options: { weekStartsOn: 1, firstWeekContainsDate: 4 },
+      },
+    })
+    assert(result === 2004)
+  })
+
+  it('`options.weekStartsOn` overwrites the first day of the week specified in locale', () => {
+    const date = new Date(2004, 11 /* Dec */, 26)
+    const result = getWeekYear(date, {
+      weekStartsOn: 1,
+      firstWeekContainsDate: 4,
+      // @ts-expect-error
+      locale: {
+        options: { weekStartsOn: 0, firstWeekContainsDate: 1 },
+      },
+    })
+    assert(result === 2004)
+  })
+
+  it('throws `RangeError` if `options.weekStartsOn` is not convertable to 0, 1, ..., 6 or undefined', () => {
+    // @ts-expect-error
+    const block = getWeekYear.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', () => {
+    // @ts-expect-error
+    const block = getWeekYear.bind(null, new Date(2007, 11 /* Dec */, 31), {
+      firstWeekContainsDate: NaN,
+    })
+    assert.throws(block, RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 1 argument', () => {
+    // @ts-expect-error
+    assert.throws(getWeekYear.bind(null), TypeError)
+  })
+})