1 files changed, 109 insertions, 0 deletions
diff --git a/date-fns/src/isSameWeek/test.ts b/date-fns/src/isSameWeek/test.ts
new file mode 100644
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+++ b/date-fns/src/isSameWeek/test.ts
@@ -0,0 +1,109 @@
+// @flow
+/* eslint-env mocha */
+
+import assert from 'power-assert'
+import isSameWeek from '.'
+
+describe('isSameWeek', function() {
+  it('returns true if the given dates have the same week', function() {
+    const result = isSameWeek(
+      new Date(2014, 7 /* Aug */, 31),
+      new Date(2014, 8 /* Sep */, 4)
+    )
+    assert(result === true)
+  })
+
+  it('returns false if the given dates have different weeks', function() {
+    const result = isSameWeek(
+      new Date(2014, 7 /* Aug */, 30),
+      new Date(2014, 8 /* Sep */, 4)
+    )
+    assert(result === false)
+  })
+
+  it('allows to specify which day is the first day of the week', function() {
+    const result = isSameWeek(
+      new Date(2014, 7 /* Aug */, 31),
+      new Date(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() {
+    const result = isSameWeek(
+      new Date(2014, 7 /* Aug */, 31),
+      new Date(2014, 8 /* Sep */, 4),
+      {
+        // @ts-expect-error
+        locale: {
+          options: { weekStartsOn: 1 }
+        }
+      }
+    )
+    assert(result === false)
+  })
+
+  it('`options.weekStartsOn` overwrites the first day of the week specified in locale', function() {
+    const result = isSameWeek(
+      new Date(2014, 7 /* Aug */, 31),
+      new Date(2014, 8 /* Sep */, 4),
+      {
+        weekStartsOn: 1,
+        // @ts-expect-error
+        locale: {
+          options: { weekStartsOn: 0 }
+        }
+      }
+    )
+    assert(result === false)
+  })
+
+  it('implicitly converts options', function() {
+    const result = isSameWeek(
+      new Date(2014, 7 /* Aug */, 31),
+      new Date(2014, 8 /* Sep */, 4),
+      // @ts-expect-error
+      { weekStartsOn: '1' }
+    )
+    assert(result === false)
+  })
+
+  it('accepts a timestamp', function() {
+    const result = isSameWeek(
+      new Date(2014, 7 /* Aug */, 31).getTime(),
+      new Date(2014, 8 /* Sep */, 4).getTime()
+    )
+    assert(result === true)
+  })
+
+  it('returns false if the first date is `Invalid Date`', function() {
+    const result = isSameWeek(new Date(NaN), new Date(1989, 6 /* Jul */, 10))
+    assert(result === false)
+  })
+
+  it('returns false if the second date is `Invalid Date`', function() {
+    const result = isSameWeek(new Date(1987, 1 /* Feb */, 11), new Date(NaN))
+    assert(result === false)
+  })
+
+  it('returns false if the both dates are `Invalid Date`', function() {
+    const result = isSameWeek(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() {
+    const block = isSameWeek.bind(
+      null,
+      new Date(2014, 7 /* Aug */, 31),
+      new Date(2014, 8 /* Sep */, 4),
+      { weekStartsOn: NaN }
+    )
+    assert.throws(block, RangeError)
+  })
+
+  it('throws TypeError exception if passed less than 2 arguments', function() {
+    assert.throws(isSameWeek.bind(null), TypeError)
+    assert.throws(isSameWeek.bind(null, 1), TypeError)
+  })
+})