test: add buffer testcase for resetting kZeroFill

Test failed or zero-sized Buffer allocations not affecting subsequent
creations of typed arrays.

PR-URL: https://github.com/nodejs/node/pull/7169
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

test/parallel/test-buffer.js

@@ -1449,3 +1449,26 @@ assert.equal(SlowBuffer.prototype.offset, undefined);
   // Check pool offset after that by trying to write string into the pool.
   assert.doesNotThrow(() => Buffer.from('abc'));
 }
+
+
+// Test failed or zero-sized Buffer allocations not affecting typed arrays
+{
+  const zeroArray = new Uint32Array(10).fill(0);
+  const sizes = [1e10, 0, 0.1, -1, 'a', undefined, null, NaN];
+  const allocators = [
+    Buffer,
+    SlowBuffer,
+    Buffer.alloc,
+    Buffer.allocUnsafe,
+    Buffer.allocUnsafeSlow
+  ];
+  for (const allocator of allocators) {
+    for (const size of sizes) {
+      try {
+        allocator(size);
+      } catch (e) {
+        assert.deepStrictEqual(new Uint32Array(10), zeroArray);
+      }
+    }
+  }
+}