planning

node_modules/zen-observable/test/concat.js

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+import assert from 'assert';
+
+describe('concat', () => {
+  it('concatenates the supplied Observable arguments', async () => {
+    let list = [];
+
+    await Observable
+      .from([1, 2, 3, 4])
+      .concat(Observable.of(5, 6, 7))
+      .forEach(x => list.push(x));
+
+    assert.deepEqual(list, [1, 2, 3, 4, 5, 6, 7]);
+  });
+
+  it('can be used multiple times to produce the same results', async () => {
+    const list1 = [];
+    const list2 = [];
+
+    const concatenated = Observable.from([1, 2, 3, 4])
+      .concat(Observable.of(5, 6, 7));
+
+    await concatenated
+      .forEach(x => list1.push(x));
+    await concatenated
+      .forEach(x => list2.push(x));
+
+    assert.deepEqual(list1, [1, 2, 3, 4, 5, 6, 7]);
+    assert.deepEqual(list2, [1, 2, 3, 4, 5, 6, 7]);
+  });
+});