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test/parallel/test-buffer-safe-unsafe.js

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+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+const safe = Buffer.alloc(10);
+
+function isZeroFilled(buf) {
+  for (let n = 0; n < buf.length; n++)
+    if (buf[n] !== 0) return false;
+  return true;
+}
+
+assert(isZeroFilled(safe));
+
+// Test that unsafe allocations doesn't affect subsequent safe allocations
+Buffer.allocUnsafe(10);
+assert(isZeroFilled(new Float64Array(10)));
+
+new Buffer(10);
+assert(isZeroFilled(new Float64Array(10)));
+
+Buffer.allocUnsafe(10);
+assert(isZeroFilled(Buffer.alloc(10)));