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node_modules/zen-observable/test/flat-map.js

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+import assert from 'assert';
+
+describe('flatMap', () => {
+  it('maps and flattens the results using the supplied callback', async () => {
+    let list = [];
+
+    await Observable.of('a', 'b', 'c').flatMap(x =>
+      Observable.of(1, 2, 3).map(y => [x, y])
+    ).forEach(x => list.push(x));
+
+    assert.deepEqual(list, [
+      ['a', 1],
+      ['a', 2],
+      ['a', 3],
+      ['b', 1],
+      ['b', 2],
+      ['b', 3],
+      ['c', 1],
+      ['c', 2],
+      ['c', 3],
+    ]);
+  });
+});