Add mocks entry point (#50)

mocks/package.json

@@ -0,0 +1,5 @@
+{
+  "main": "../build/cjs/mocks.js",
+  "module": "../build/esm/mocks.js",
+  "types": "../build/esm/mocks.d.ts"
+}

src/mocks.js.flow

@@ -3,13 +3,32 @@
 import type { BoundActions } from 'react-sweet-state';
 
 import type {
+  Location,
+  Match,
+  MatchedRoute,
+  Query,
   Route,
   RouteContext,
   RouterActionsType,
   RouterContext,
+  RouteResourceResponse,
 } from './types.js.flow';
 
 declare export var mockRoute: Route;
 declare export var mockRouterActions: BoundActions<RouterActionsType>;
-declare export var mockRouterContextProp: RouteContext;
-declare export var mockRouterStoreContextProp: RouterContext;
+declare export var mockRouterStoreContext: RouterContext;
+declare export function mockRouterStoreContextProp(
+  key: string,
+  mock: { ... }
+): RouterContext;
+declare export var mockLocation: Location;
+declare export var mockMatch: Match;
+declare export var mockMatchedRoute: MatchedRoute;
+declare export var mockQuery: Query;
+declare export var mockRouteContext: RouteContext;
+declare export function mockRouteContextProp(
+  key: string,
+  mock: { ... }
+): RouteContext;
+declare export var mockRouteResourceResponse: RouteResourceResponse;
+declare export var mockRoutes: Route[];