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node_modules/zen-observable/test/map.js

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+import assert from 'assert';
+
+describe('map', () => {
+  it('maps the results using the supplied callback', async () => {
+    let list = [];
+
+    await Observable.from([1, 2, 3])
+      .map(x => x * 2)
+      .forEach(x => list.push(x));
+
+    assert.deepEqual(list, [2, 4, 6]);
+  });
+});