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backend/node_modules/restructure/test/LazyArray.js

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+const {LazyArray, Pointer, uint8, uint16, DecodeStream, EncodeStream} = require('../');
+const should = require('chai').should();
+const concat = require('concat-stream');
+
+describe('LazyArray', function() {
+  describe('decode', function() {
+    it('should decode items lazily', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, 4);
+
+      const arr = array.decode(stream);
+      arr.should.not.be.an.instanceof(Array);
+      arr.should.have.length(4);
+      stream.pos.should.equal(4);
+
+      arr.get(0).should.equal(1);
+      arr.get(1).should.equal(2);
+      arr.get(2).should.equal(3);
+      arr.get(3).should.equal(4);
+
+      should.not.exist(arr.get(-1));
+      return should.not.exist(arr.get(5));
+    });
+
+    it('should be able to convert to an array', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, 4);
+
+      const arr = array.decode(stream);
+      return arr.toArray().should.deep.equal([1, 2, 3, 4]);
+  });
+
+    it('should have an inspect method', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, 4);
+
+      const arr = array.decode(stream);
+      return arr.inspect().should.equal('[ 1, 2, 3, 4 ]');
+    });
+
+    return it('should decode length as number before array', function() {
+      const stream = new DecodeStream(Buffer.from([4, 1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, uint8);
+      const arr = array.decode(stream);
+
+      return arr.toArray().should.deep.equal([1, 2, 3, 4]);
+  });
+});
+
+  describe('size', () =>
+    it('should work with LazyArrays', function() {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, 4);
+      const arr = array.decode(stream);
+
+      return array.size(arr).should.equal(4);
+    })
+  );
+
+  return describe('encode', () =>
+    it('should work with LazyArrays', function(done) {
+      const stream = new DecodeStream(Buffer.from([1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, 4);
+      const arr = array.decode(stream);
+
+      const enc = new EncodeStream;
+      enc.pipe(concat(function(buf) {
+        buf.should.deep.equal(Buffer.from([1, 2, 3, 4]));
+        return done();
+      })
+      );
+
+      array.encode(enc, arr);
+      return enc.end();
+    })
+  );
+});