Initial Sample.

graphql-subscription/node_modules/zen-observable/test/extras/combine-latest.js

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+import assert from 'assert';
+import { parse } from './parse.js';
+import { combineLatest } from '../../src/extras.js';
+
+describe('extras/combineLatest', () => {
+  it('should emit arrays containing the most recent values', async () => {
+    let output = [];
+    await combineLatest(
+      parse('a-b-c-d'),
+      parse('-A-B-C-D')
+    ).forEach(
+      value => output.push(value.join(''))
+    );
+    assert.deepEqual(output, [
+      'aA',
+      'bA',
+      'bB',
+      'cB',
+      'cC',
+      'dC',
+      'dD',
+    ]);
+  });
+
+  it('should emit values in the correct order', async () => {
+    let output = [];
+    await combineLatest(
+      parse('-a-b-c-d'),
+      parse('A-B-C-D')
+    ).forEach(
+      value => output.push(value.join(''))
+    );
+    assert.deepEqual(output, [
+      'aA',
+      'aB',
+      'bB',
+      'bC',
+      'cC',
+      'cD',
+      'dD',
+    ]);
+  });
+});

graphql-subscription/node_modules/zen-observable/test/extras/merge.js

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+import assert from 'assert';
+import { parse } from './parse.js';
+import { merge } from '../../src/extras.js';
+
+describe('extras/merge', () => {
+  it('should emit all data from each input in parallel', async () => {
+    let output = '';
+    await merge(
+      parse('a-b-c-d'),
+      parse('-A-B-C-D')
+    ).forEach(
+      value => output += value
+    );
+    assert.equal(output, 'aAbBcCdD');
+  });
+});

graphql-subscription/node_modules/zen-observable/test/extras/parse.js

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+export function parse(string) {
+  return new Observable(async observer => {
+    await null;
+    for (let char of string) {
+      if (observer.closed) return;
+      else if (char !== '-') observer.next(char);
+      await null;
+    }
+    observer.complete();
+  });
+}

graphql-subscription/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',
+    ]);
+  });
+});