1 files changed, 42 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/String/prototype/includes/coerced-values-of-position.js b/js/src/tests/test262/built-ins/String/prototype/includes/coerced-values-of-position.js
new file mode 100644
index 0000000000..5976cde337
--- /dev/null
+++ b/js/src/tests/test262/built-ins/String/prototype/includes/coerced-values-of-position.js
@@ -0,0 +1,42 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 21.1.3.7
+description: >
+  Returns based on coerced values of position.
+info: |
+  21.1.3.7 String.prototype.includes ( searchString [ , position ] )
+
+  ...
+  9. Let pos be ToInteger(position). (If position is undefined, this step
+  produces the value 0).
+  10. ReturnIfAbrupt(pos).
+  11. Let len be the number of elements in S.
+  12. Let start be min(max(pos, 0), len).
+  13. Let searchLen be the number of elements in searchStr.
+  14. If there exists any integer k not smaller than start such that k +
+  searchLen is not greater than len, and for all nonnegative integers j less
+  than searchLen, the code unit at index k+j of S is the same as the code unit
+  at index j of searchStr, return true; but if there is no such integer k,
+  return false.
+  ...
+features: [String.prototype.includes]
+---*/
+
+var str = 'The future is cool!';
+
+assert(str.includes('The future', NaN), 'NaN coerced to 0');
+assert(str.includes('The future', null), 'null coerced to 0');
+assert(str.includes('The future', false), 'false coerced to 0');
+assert(str.includes('The future', ''), '"" coerced to 0');
+assert(str.includes('The future', '0'), '"0" coerced to 0');
+assert(str.includes('The future', undefined), 'undefined coerced to 0');
+assert(str.includes('The future', 0.4), '0.4 coerced to 0');
+
+assert(str.includes('The future', -1));
+
+assert.sameValue(str.includes('The future', true), false, 'true coerced to 1');
+assert.sameValue(str.includes('The future', '1'), false, '"1" coerced to 1');
+assert.sameValue(str.includes('The future', 1.4), false, '1.4 coerced to 1');
+
+reportCompare(0, 0);