Support renderPending with named routes

src/utils/resolveRenderArgs.js

@@ -48,7 +48,7 @@ export default async function* resolveRenderArgs({
     for await (const elements of resolver.resolveElements(augmentedMatch)) {
       yield {
         ...augmentedMatch,
-        elements: foldElements([...elements], match.routeIndices),
+        elements: elements && foldElements([...elements], match.routeIndices),
       };
     }
   } catch (e) {

test/helpers.js

@@ -0,0 +1,25 @@
+import resolver from '../src/resolver';
+
+export function timeout(delay) {
+  return new Promise((resolve) => {
+    setTimeout(resolve, delay);
+  });
+}
+
+export class InstrumentedResolver {
+  constructor() {
+    // This should be a rejected promise to prevent awaiting on done before
+    // trying to resolve, but Node doesn't like naked unresolved promises.
+    this.done = new Promise(() => {});
+  }
+
+  async * resolveElements(match) {
+    let resolveDone;
+    this.done = new Promise((resolve) => {
+      resolveDone = resolve;
+    });
+
+    yield* resolver.resolveElements(match);
+    resolveDone();
+  }
+}

test/render.test.js

@@ -1,27 +1,23 @@
+import ServerProtocol from 'farce/lib/ServerProtocol';
 import React from 'react';
 import ReactTestUtils from 'react-dom/test-utils';
 
+import createFarceRouter from '../src/createFarceRouter';
 import createRender from '../src/createRender';
-import getFarceResult from '../src/server/getFarceResult';
 
-async function render(url, routeConfig) {
-  const { element } = await getFarceResult({
-    url,
-    routeConfig,
-    render: createRender({}),
-  });
-
-  return ReactTestUtils.renderIntoDocument(element);
-}
+import { timeout, InstrumentedResolver } from './helpers';
 
 describe('render', () => {
   it('should support nested routes', async () => {
-    const instance = await render(
-      '/foo/baz/a',
-      [
+    const Router = createFarceRouter({
+      historyProtocol: new ServerProtocol('/foo/baz/a'),
+      routeConfig: [
         {
           path: 'foo',
-          Component: ({ children }) => <div className="foo">{children}</div>,
+          getComponent: async () => {
+            await timeout(20);
+            return ({ children }) => <div className="foo">{children}</div>;
+          },
           children: [
             {
               path: 'bar',
@@ -36,8 +32,24 @@ describe('render', () => {
           ],
         },
       ],
+
+      render: createRender({
+        renderPending: () => <div className="pending" />,
+      }),
+    });
+
+    const resolver = new InstrumentedResolver();
+    const instance = ReactTestUtils.renderIntoDocument(
+      <Router resolver={resolver} />,
     );
 
+    // Initial pending render is asynchronous.
+    await timeout(10);
+
+    ReactTestUtils.findRenderedDOMComponentWithClass(instance, 'pending');
+
+    await resolver.done;
+
     ReactTestUtils.findRenderedDOMComponentWithClass(instance, 'foo');
     expect(
       ReactTestUtils.scryRenderedDOMComponentsWithClass(instance, 'bar'),
@@ -50,17 +62,20 @@ describe('render', () => {
   });
 
   it('should support named child routes', async () => {
-    const instance = await render(
-      '/foo/bar/qux/a',
-      [
+    const Router = createFarceRouter({
+      historyProtocol: new ServerProtocol('/foo/bar/qux/a'),
+      routeConfig: [
         {
           path: 'foo',
-          Component: ({ nav, main }) => (
-            <div className="foo">
-              {nav}
-              {main}
-            </div>
-          ),
+          getComponent: async () => {
+            await timeout(20);
+            return ({ nav, main }) => (
+              <div className="foo">
+                {nav}
+                {main}
+              </div>
+            );
+          },
           children: [
             {
               path: 'bar',
@@ -88,8 +103,24 @@ describe('render', () => {
           ],
         },
       ],
+
+      render: createRender({
+        renderPending: () => <div className="pending" />,
+      }),
+    });
+
+    const resolver = new InstrumentedResolver();
+    const instance = ReactTestUtils.renderIntoDocument(
+      <Router resolver={resolver} />,
     );
 
+    // Initial pending render is asynchronous.
+    await timeout(10);
+
+    ReactTestUtils.findRenderedDOMComponentWithClass(instance, 'pending');
+
+    await resolver.done;
+
     ReactTestUtils.findRenderedDOMComponentWithClass(instance, 'foo');
     ReactTestUtils.findRenderedDOMComponentWithClass(instance, 'bar-nav');
 

test/server/getFarceResult.test.js

@@ -0,0 +1,105 @@
+import React from 'react';
+import ReactTestUtils from 'react-dom/test-utils';
+
+import createRender from '../../src/createRender';
+import getFarceResult from '../../src/server/getFarceResult';
+
+async function render(url, routeConfig) {
+  const { element } = await getFarceResult({
+    url,
+    routeConfig,
+    render: createRender({}),
+  });
+
+  return ReactTestUtils.renderIntoDocument(element);
+}
+
+describe('getFarceResult', () => {
+  it('should support nested routes', async () => {
+    const instance = await render(
+      '/foo/baz/a',
+      [
+        {
+          path: 'foo',
+          Component: ({ children }) => <div className="foo">{children}</div>,
+          children: [
+            {
+              path: 'bar',
+              Component: () => <div className="bar" />,
+            },
+            {
+              path: 'baz/:qux',
+              Component: ({ params }) => (
+                <div className="baz">{params.qux}</div>
+              ),
+            },
+          ],
+        },
+      ],
+    );
+
+    ReactTestUtils.findRenderedDOMComponentWithClass(instance, 'foo');
+    expect(
+      ReactTestUtils.scryRenderedDOMComponentsWithClass(instance, 'bar'),
+    ).toHaveLength(0);
+
+    const bazNode = ReactTestUtils.findRenderedDOMComponentWithClass(
+      instance, 'baz',
+    );
+    expect(bazNode.textContent).toBe('a');
+  });
+
+  it('should support named child routes', async () => {
+    const instance = await render(
+      '/foo/bar/qux/a',
+      [
+        {
+          path: 'foo',
+          Component: ({ nav, main }) => (
+            <div className="foo">
+              {nav}
+              {main}
+            </div>
+          ),
+          children: [
+            {
+              path: 'bar',
+              children: {
+                nav: [
+                  {
+                    path: '(.*)?',
+                    Component: () => <div className="bar-nav" />,
+                  },
+                ],
+                main: [
+                  {
+                    path: 'baz',
+                    Component: () => <div className="baz" />,
+                  },
+                  {
+                    path: 'qux/:quux',
+                    Component: ({ params }) => (
+                      <div className="qux">{params.quux}</div>
+                    ),
+                  },
+                ],
+              },
+            },
+          ],
+        },
+      ],
+    );
+
+    ReactTestUtils.findRenderedDOMComponentWithClass(instance, 'foo');
+    ReactTestUtils.findRenderedDOMComponentWithClass(instance, 'bar-nav');
+
+    expect(
+      ReactTestUtils.scryRenderedDOMComponentsWithClass(instance, 'baz'),
+    ).toHaveLength(0);
+
+    const quxNode = ReactTestUtils.findRenderedDOMComponentWithClass(
+      instance, 'qux',
+    );
+    expect(quxNode.textContent).toBe('a');
+  });
+});