add an integration test of updating config via Mirador api

minimal_redux_poc/__tests__/integration/mirador/config_updating_from_instance.test.js

@@ -0,0 +1,17 @@
+/* global miradorInstance */
+
+describe('Config updating from instance', () => {
+  beforeAll(async () => {
+    await page.goto('http://127.0.0.1:4488/__tests__/integration/mirador/');
+  });
+  it('can modify the config via api', async () => {
+    await page.evaluate(() => {
+      const a = miradorInstance.actions.updateConfig({ foo: 'bat' });
+      miradorInstance.store.dispatch(a);
+    });
+    const config = await page.evaluate(() => (
+      miradorInstance.store.getState().config
+    ));
+    await expect(config.foo).toBe('bat');
+  });
+});

minimal_redux_poc/__tests__/integration/mirador/index.html

@@ -10,7 +10,7 @@
     <div id="mirador"></div>
     <script>document.write("<script type='text/javascript' src='../../../dist/mirador.min.js?v=" + Date.now() + "'><\/script>");</script>
     <script type="text/javascript">
-      Mirador({
+      var miradorInstance = Mirador({
         id: 'mirador',
         plugins: ['HelloWorld']
       });

minimal_redux_poc/src/config/settings.js

@@ -1,3 +1,3 @@
 export default {
-  manifestVersion: 'v2',
+  foo: 'bar',
 };