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node_modules/zen-observable/test/extras/zip.js

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+import assert from 'assert';
+import { parse } from './parse.js';
+import { zip } from '../../src/extras.js';
+
+describe('extras/zip', () => {
+  it('should emit pairs of corresponding index values', async () => {
+    let output = [];
+    await zip(
+      parse('a-b-c-d'),
+      parse('-A-B-C-D')
+    ).forEach(
+      value => output.push(value.join(''))
+    );
+    assert.deepEqual(output, [
+      'aA',
+      'bB',
+      'cC',
+      'dD',
+    ]);
+  });
+});