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test/parallel/test-fs-truncate-sync.js

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+'use strict';
+require('../common');
+const assert = require('assert');
+const path = require('path');
+const fs = require('fs');
+const tmpdir = require('../common/tmpdir');
+const tmp = tmpdir.path;
+
+tmpdir.refresh();
+
+const filename = path.resolve(tmp, 'truncate-sync-file.txt');
+
+fs.writeFileSync(filename, 'hello world', 'utf8');
+
+fs.truncateSync(filename, 5);
+assert(fs.readFileSync(filename).equals(Buffer.from('hello')));
+
+fs.unlinkSync(filename);