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node_modules/lazystream/test/pipe_test.js

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+
+var stream = require('../lib/lazystream');
+var helper = require('./helper');
+
+exports.pipe = {
+  readwrite: function(test) {
+    var expected = [ 'line1\n', 'line2\n' ];
+    var actual = [];
+    var readableInstantiated = false;
+    var writableInstantiated = false;
+
+    test.expect(3);
+
+    var readable = new stream.Readable(function() {
+      readableInstantiated = true;
+      return new helper.DummyReadable([].concat(expected));
+    });
+
+    var writable = new stream.Writable(function() {
+      writableInstantiated = true;
+      return new helper.DummyWritable(actual);
+    });
+
+    test.equal(readableInstantiated, false, 'DummyReadable should only be instantiated when it is needed');
+    test.equal(writableInstantiated, false, 'DummyWritable should only be instantiated when it is needed');
+
+    writable.on('end', function() {
+      test.equal(actual.join(''), expected.join(''), 'Piping on demand streams should keep data intact');
+      test.done();
+    });
+    
+    readable.pipe(writable);
+  }
+};
+
+