1 files changed, 27 insertions, 0 deletions
diff --git a/library/alloc/tests/btree/mod.rs b/library/alloc/tests/btree/mod.rs
new file mode 100644
index 00000000000..1d08ae13e05
--- /dev/null
+++ b/library/alloc/tests/btree/mod.rs
@@ -0,0 +1,27 @@
+mod map;
+mod set;
+
+/// XorShiftRng
+struct DeterministicRng {
+    x: u32,
+    y: u32,
+    z: u32,
+    w: u32,
+}
+
+impl DeterministicRng {
+    fn new() -> Self {
+        DeterministicRng { x: 0x193a6754, y: 0xa8a7d469, z: 0x97830e05, w: 0x113ba7bb }
+    }
+
+    fn next(&mut self) -> u32 {
+        let x = self.x;
+        let t = x ^ (x << 11);
+        self.x = self.y;
+        self.y = self.z;
+        self.z = self.w;
+        let w_ = self.w;
+        self.w = w_ ^ (w_ >> 19) ^ (t ^ (t >> 8));
+        self.w
+    }
+}