1 files changed, 43 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/math-random.js b/js/src/jit-test/tests/basic/math-random.js
new file mode 100644
index 0000000000..e9efab5882
--- /dev/null
+++ b/js/src/jit-test/tests/basic/math-random.js
@@ -0,0 +1,43 @@
+function test() {
+  setRNGState(0x12341234, 0x98765);
+
+  function f() {
+    let x = [];
+    for (let i = 0; i < 10000; i++)  {
+      x.push(Math.random());
+    }
+    return x;
+  }
+  let x = f();
+  assertEq(x[0], 0.28443027522441433);
+  assertEq(x[10], 0.5283908544644392);
+  assertEq(x[100], 0.5593668121538891);
+  assertEq(x[1000], 0.7008807796441313);
+  assertEq(x[2000], 0.11737403776989574);
+  assertEq(x[3000], 0.08573924080320472);
+  assertEq(x[4000], 0.22428965439295678);
+  assertEq(x[5000], 0.4657521920883555);
+  assertEq(x[6000], 0.11816220100329233);
+  assertEq(x[7000], 0.6306689010335697);
+  assertEq(x[8000], 0.8654862148946609);
+  assertEq(x[9000], 0.31734259460387015);
+  assertEq(x[9999], 0.013959566914027777);
+
+  // Test some other (arbitrary) seeds.
+  setRNGState(0, 1);
+  x = f();
+  assertEq(x[0], 2.220446049250313e-16);
+  assertEq(x[2000], 0.8259328082050756);
+  assertEq(x[6000], 0.01060492365550314);
+  assertEq(x[9999], 0.7402370773147143);
+
+  setRNGState(0x0fff0101, 0x44440001);
+  x = f();
+  assertEq(x[0], 0.24994062119568194);
+  assertEq(x[2000], 0.4375430448883283);
+  assertEq(x[6000], 0.7298689950209452);
+  assertEq(x[9999], 0.13284280897626954);
+}
+
+if (typeof setRNGState == "function")
+  test();