feat(router): add route config validation

modules/@angular/router/test/config.spec.ts

@@ -0,0 +1,50 @@
+import {validateConfig} from '../src/config';
+
+describe('config', () => {
+  describe("validateConfig", () => {
+    it("should not throw when no errors", () => {
+      validateConfig([
+        { path: '', redirectTo: 'b' },
+        { path: 'b', component: ComponentA }
+      ]);
+    });
+
+    it("should throw when redirectTo and children are used together", () => {
+      expect(() => {
+        validateConfig([
+          { path: 'a', redirectTo: 'b', children: [
+            {path: 'b', component: ComponentA}
+          ] }
+        ]);
+      }).toThrowError(`Invalid configuration of route 'a': redirectTo and children cannot be used together`);
+    });
+
+    it("should throw when component and redirectTo are used together", () => {
+      expect(() => {
+        validateConfig([
+              { path: 'a', component: ComponentA, redirectTo: 'b' }
+        ]);
+      }).toThrowError(`Invalid configuration of route 'a': redirectTo and component cannot be used together`);
+    });
+
+    it("should throw when path is missing", () => {
+      expect(() => {
+        validateConfig([
+              { component: '', redirectTo: 'b' }
+        ]);
+      }).toThrowError(`Invalid route configuration: routes must have path specified`);
+    });
+
+    it("should throw when path starts with a slash", () => {
+      expect(() => {
+        validateConfig([
+              { path: '/a', componenta: '', redirectTo: 'b' }
+        ]);
+      }).toThrowError(`Invalid route configuration of route '/a': path cannot start with a slash`);
+    });
+  });
+});
+
+class ComponentA {}
+class ComponentB {}
+class ComponentC {}