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diff --git a/js/src/tests/non262/Tuple/prototype/flat/flat.js b/js/src/tests/non262/Tuple/prototype/flat/flat.js
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+++ b/js/src/tests/non262/Tuple/prototype/flat/flat.js
@@ -0,0 +1,96 @@
+// |reftest| skip-if(!this.hasOwnProperty("Tuple"))
+/*
+8.2.3.16 Tuple.prototype.flat ( [ depth ] )
+When the flat method is called with zero or one arguments, the following steps are taken:
+
+1. Let T be ? thisTupleValue(this value).
+2. Let list be T.[[Sequence]].
+3. Let depthNum be 1.
+4. If depth is not undefined, then
+a. Set depthNum to ? ToInteger(depth).
+5. Let flat be a new empty List.
+6. Perform ? FlattenIntoTuple(flat, list, depthNum).
+7. Return a new Tuple value whose [[Sequence]] is flat.
+
+8.2.3.16.1 FlattenIntoTuple ( target, source, depth [ , mapperFunction, thisArg ] )
+The abstract operation FlattenIntoTuple takes arguments target, source, and depth and optional arguments mapperFunction and thisArg. It performs the following steps when called:
+
+1. Assert: target is a List.
+2. Assert: source is a List.
+3. Assert: ! IsInteger(depth) is true, or depth is either +∞ or -∞.
+4. Assert: If mapperFunction is present, then ! IsCallable(mapperFunction) is true, thisArg is present, and depth is 1.
+5. Let sourceIndex be 0.
+6. For each element of source,
+a. If mapperFunction is present, then
+i. Set element to ? Call(mapperFunction, thisArg, « element, sourceIndex, source »).
+ii. If Type(element) is Object, throw a TypeError exception.
+b. If depth > 0 and Type(element) is Tuple, then
+i. Perform ? FlattenIntoTuple(target, element, depth - 1).
+c. Else,
+i. Let len be the length of target.
+ii. If len ≥ 253 - 1, throw a TypeError exception.
+iii. Append element to target.
+d. Set sourceIndex to sourceIndex + 1.
+
+*/
+/* Step 1 */
+/* flat() should throw on a non-Tuple */
+let method = Tuple.prototype.flat;
+assertEq(method.call(#[1,#[2],3]), #[1,2,3]);
+assertEq(method.call(Object(#[1,#[2],3])), #[1,2,3]);
+assertThrowsInstanceOf(() => method.call("monkeys"), TypeError,
+                       "value of TupleObject must be a Tuple");
+assertThrowsInstanceOf(() => method.call(null), TypeError,
+                       "value of TupleObject must be a Tuple");
+assertThrowsInstanceOf(() => method.call(), TypeError,
+                       "value of TupleObject must be a Tuple");
+
+
+let tup = #[1,2,#[3,#[4,5],6],#[5,6],7];
+let tup2 = #[1,2,#[3,#[4,#["a", "b"], 5],6],#[5,#[6,#[7,8,#[9,10]]]],7];
+
+/* Step 3 -- depth is converted to Integer */
+assertEq(tup.flat("monkeys"), tup.flat(0));
+assertEq(tup.flat({}), tup.flat(0));
+assertEq(tup.flat(+0), tup.flat(0));
+assertEq(tup.flat(-0), tup.flat(0));
+assertEq(tup.flat('2'), tup.flat(2));
+assertEq(tup.flat(true), tup.flat(1));
+assertEq(tup.flat(false), tup.flat(0));
+assertEq(tup.flat(null), tup.flat(0));
+assertEq(tup.flat(NaN), tup.flat(0));
+assertEq(tup.flat([1,2,3]), tup.flat(0));
+assertThrowsInstanceOf(() => tup.flat(Symbol("x")), TypeError,
+                       "can't convert symbol to number");
+assertThrowsInstanceOf(() => tup.flat(Object.create(null)), TypeError,
+                       "can't convert Object to number");
+assertThrowsInstanceOf(() => tup.flat(#[1]), TypeError,
+                       "can't convert Tuple to number");
+
+
+/* Step 3 -- if depth is undefined, depthNum is set to 1 */
+assertEq(tup.flat(undefined), tup.flat(1));
+assertEq(tup.flat(), tup.flat(1));
+
+/* Step 7 */
+assertEq(#[].flat(), #[]);
+assertEq(#[1].flat(), #[1]);
+assertEq(#[#[1,2],#[3,4]].flat(), #[1,2,3,4]);
+assertEq(tup.flat(0), tup);
+assertEq(tup.flat(1), #[1,2,3,#[4,5],6,5,6,7]);
+assertEq(tup.flat(2), #[1,2,3,4,5,6,5,6,7]);
+assertEq(tup.flat(3), tup.flat(2));
+assertEq(tup2.flat(0), tup2);
+assertEq(tup2.flat(1), #[1,2,3,#[4,#["a", "b"], 5],6,5,#[6,#[7,8,#[9,10]]],7]);
+assertEq(tup2.flat(2), #[1,2,3,4,#["a", "b"],5,6,5,6,#[7, 8, #[9, 10]],7]);
+assertEq(tup2.flat(3), #[1,2,3,4,"a","b",5,6,5,6, 7, 8, #[9, 10], 7]);
+assertEq(tup2.flat(4), #[1,2,3,4,"a","b",5,6,5,6, 7, 8, 9, 10, 7]);
+
+/* FlattenIntoTuple steps: */
+/* Step 3: depth can be Infinity or -Infinity */
+assertEq(tup2.flat(Infinity), tup2.flat(4));
+assertEq(tup2.flat(-Infinity), tup2.flat(0));
+
+/* Step 6.c.ii. -- throw if len would be > n^253 - 1 -- not sure how to test this */
+
+reportCompare(0, 0);