Allow chromeless applications to render via non-/app routes (#51527)

* Allow chromeless applications to render via non-/app routes

* Address review nits

* Fix chrome:application integration tests

* Move extraneous application integration tests to unit tests

docs/development/core/public/kibana-plugin-public.app.approute.md

@@ -0,0 +1,13 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-public](./kibana-plugin-public.md) &gt; [App](./kibana-plugin-public.app.md) &gt; [appRoute](./kibana-plugin-public.app.approute.md)
+
+## App.appRoute property
+
+Override the application's routing path from `/app/${id}`<!-- -->. Must be unique across registered applications. Should not include the base path from HTTP.
+
+<b>Signature:</b>
+
+```typescript
+appRoute?: string;
+```

docs/development/core/public/kibana-plugin-public.app.md

@@ -16,6 +16,7 @@ export interface App extends AppBase
 
 |  Property | Type | Description |
 |  --- | --- | --- |
+|  [appRoute](./kibana-plugin-public.app.approute.md) | <code>string</code> | Override the application's routing path from <code>/app/${id}</code>. Must be unique across registered applications. Should not include the base path from HTTP. |
 |  [chromeless](./kibana-plugin-public.app.chromeless.md) | <code>boolean</code> | Hide the UI chrome when the application is mounted. Defaults to <code>false</code>. Takes precedence over chrome service visibility settings. |
 |  [mount](./kibana-plugin-public.app.mount.md) | <code>AppMount &#124; AppMountDeprecated</code> | A mount function called when the user navigates to this app's route. May have signature of [AppMount](./kibana-plugin-public.appmount.md) or [AppMountDeprecated](./kibana-plugin-public.appmountdeprecated.md)<!-- -->. |
 

docs/development/core/public/kibana-plugin-public.appmountparameters.appbasepath.md

@@ -4,7 +4,7 @@
 
 ## AppMountParameters.appBasePath property
 
-The base path for configuring the application's router.
+The route path for configuring navigation to the application. This string should not include the base path from HTTP.
 
 <b>Signature:</b>
 
@@ -22,6 +22,7 @@ export class MyPlugin implements Plugin {
   setup({ application }) {
     application.register({
      id: 'my-app',
+     appRoute: '/my-app',
      async mount(params) {
        const { renderApp } = await import('./application');
        return renderApp(params);

docs/development/core/public/kibana-plugin-public.appmountparameters.md

@@ -15,6 +15,6 @@ export interface AppMountParameters
 
 |  Property | Type | Description |
 |  --- | --- | --- |
-|  [appBasePath](./kibana-plugin-public.appmountparameters.appbasepath.md) | <code>string</code> | The base path for configuring the application's router. |
+|  [appBasePath](./kibana-plugin-public.appmountparameters.appbasepath.md) | <code>string</code> | The route path for configuring navigation to the application. This string should not include the base path from HTTP. |
 |  [element](./kibana-plugin-public.appmountparameters.element.md) | <code>HTMLElement</code> | The container element to render the application into. |
 

src/core/public/application/application_service.mock.ts

@@ -20,15 +20,13 @@
 import { Subject } from 'rxjs';
 
 import { capabilitiesServiceMock } from './capabilities/capabilities_service.mock';
-import { ApplicationService } from './application_service';
 import {
   ApplicationSetup,
   InternalApplicationStart,
   ApplicationStart,
   InternalApplicationSetup,
 } from './types';
-
-type ApplicationServiceContract = PublicMethodsOf<ApplicationService>;
+import { ApplicationServiceContract } from './test_types';
 
 const createSetupContractMock = (): jest.Mocked<ApplicationSetup> => ({
   register: jest.fn(),
@@ -41,23 +39,27 @@ const createInternalSetupContractMock = (): jest.Mocked<InternalApplicationSetup
   registerMountContext: jest.fn(),
 });
 
-const createStartContractMock = (legacyMode = false): jest.Mocked<ApplicationStart> => ({
+const createStartContractMock = (): jest.Mocked<ApplicationStart> => ({
   capabilities: capabilitiesServiceMock.createStartContract().capabilities,
   navigateToApp: jest.fn(),
   getUrlForApp: jest.fn(),
   registerMountContext: jest.fn(),
 });
 
-const createInternalStartContractMock = (): jest.Mocked<InternalApplicationStart> => ({
-  availableApps: new Map(),
-  availableLegacyApps: new Map(),
-  capabilities: capabilitiesServiceMock.createStartContract().capabilities,
-  navigateToApp: jest.fn(),
-  getUrlForApp: jest.fn(),
-  registerMountContext: jest.fn(),
-  currentAppId$: new Subject<string | undefined>(),
-  getComponent: jest.fn(),
-});
+const createInternalStartContractMock = (): jest.Mocked<InternalApplicationStart> => {
+  const currentAppId$ = new Subject<string | undefined>();
+
+  return {
+    availableApps: new Map(),
+    availableLegacyApps: new Map(),
+    capabilities: capabilitiesServiceMock.createStartContract().capabilities,
+    currentAppId$: currentAppId$.asObservable(),
+    getComponent: jest.fn(),
+    getUrlForApp: jest.fn(),
+    navigateToApp: jest.fn().mockImplementation(appId => currentAppId$.next(appId)),
+    registerMountContext: jest.fn(),
+  };
+};
 
 const createMock = (): jest.Mocked<ApplicationServiceContract> => ({
   setup: jest.fn().mockReturnValue(createInternalSetupContractMock()),
@@ -69,7 +71,6 @@ export const applicationServiceMock = {
   create: createMock,
   createSetupContract: createSetupContractMock,
   createStartContract: createStartContractMock,
-
   createInternalSetupContract: createInternalSetupContractMock,
   createInternalStartContract: createInternalStartContractMock,
 };