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node_modules/zen-observable/test/reduce.js

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+import assert from 'assert';
+
+describe('reduce', () => {
+  it('reduces without a seed', async () => {
+    await Observable.from([1, 2, 3, 4, 5, 6]).reduce((a, b) => {
+      return a + b;
+    }).forEach(x => {
+      assert.equal(x, 21);
+    });
+  });
+
+  it('errors if empty and no seed', async () => {
+    try {
+      await Observable.from([]).reduce((a, b) => {
+        return a + b;
+      }).forEach(() => null);
+      assert.ok(false);
+    } catch (err) {
+      assert.ok(true);
+    }
+  });
+
+  it('reduces with a seed', async () => {
+    Observable.from([1, 2, 3, 4, 5, 6]).reduce((a, b) => {
+      return a + b;
+    }, 100).forEach(x => {
+      assert.equal(x, 121);
+    });
+  });
+
+  it('reduces an empty list with a seed', async () => {
+    await Observable.from([]).reduce((a, b) => {
+      return a + b;
+    }, 100).forEach(x => {
+      assert.equal(x, 100);
+    });
+  });
+});