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node_modules/restructure/test/LazyArray.js

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+import assert from 'assert';
+import {LazyArray, Pointer, uint8, uint16, DecodeStream, EncodeStream} from 'restructure';
+
+describe('LazyArray', function() {
+  describe('decode', function() {
+    it('should decode items lazily', function() {
+      const stream = new DecodeStream(new Uint8Array([1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, 4);
+
+      const arr = array.decode(stream);
+      assert(!(arr instanceof Array));
+      assert.equal(arr.length, 4);
+      assert.equal(stream.pos, 4);
+
+      assert.equal(arr.get(0), 1);
+      assert.equal(arr.get(1), 2);
+      assert.equal(arr.get(2), 3);
+      assert.equal(arr.get(3), 4);
+
+      assert.equal(arr.get(-1), null);
+      assert.equal(arr.get(5), null);
+    });
+
+    it('should be able to convert to an array', function() {
+      const stream = new DecodeStream(new Uint8Array([1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, 4);
+
+      const arr = array.decode(stream);
+      assert.deepEqual(arr.toArray(), [1, 2, 3, 4]);
+    });
+
+    it('should decode length as number before array', function() {
+      const stream = new DecodeStream(new Uint8Array([4, 1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, uint8);
+      const arr = array.decode(stream);
+
+      assert.deepEqual(arr.toArray(), [1, 2, 3, 4]);
+    });
+  });
+
+  describe('size', () =>
+    it('should work with LazyArrays', function() {
+      const stream = new DecodeStream(new Uint8Array([1, 2, 3, 4, 5]));
+      const array = new LazyArray(uint8, 4);
+      const arr = array.decode(stream);
+
+      assert.equal(array.size(arr), 4);
+    })
+  );
+
+  describe('encode', () =>
+    it('should work with LazyArrays', function() {
+      const array = new LazyArray(uint8, 4);
+      const arr = array.fromBuffer(new Uint8Array([1, 2, 3, 4, 5]));
+      const buffer = array.toBuffer(arr);
+      assert.deepEqual(buffer, new Uint8Array([1, 2, 3, 4]));
+    })
+  );
+});