Added a test for guard.

src/Squidex/app/shared/guards/schema-must-exist-published.guard.spec.ts

@@ -9,6 +9,8 @@ import { Router, RouterStateSnapshot } from '@angular/router';
 import { of } from 'rxjs';
 import { IMock, Mock, Times } from 'typemoq';
 
+import { MathHelper } from '@app/framework';
+
 import { SchemaDetailsDto } from './../services/schemas.service';
 import { SchemasState } from './../state/schemas.state';
 import { SchemaMustExistPublishedGuard } from './schema-must-exist-published.guard';
@@ -21,7 +23,7 @@ describe('SchemaMustExistPublishedGuard', () => {
     };
 
     let schemasState: IMock<SchemasState>;
-    let state: RouterStateSnapshot = <any>{};
+    let state: RouterStateSnapshot = <any>{ url: 'current-url' };
     let router: IMock<Router>;
     let schemaGuard: SchemaMustExistPublishedGuard;
 
@@ -75,4 +77,19 @@ describe('SchemaMustExistPublishedGuard', () => {
 
         router.verify(x => x.navigate(['/404']), Times.once());
     });
+
+    it('should redirect to content when singleton', () => {
+        schemasState.setup(x => x.select('123'))
+        .returns(() => of(<SchemaDetailsDto>{ isSingleton: true }));
+
+        let result: boolean;
+
+        schemaGuard.canActivate(route, state).subscribe(x => {
+            result = x;
+        }).unsubscribe();
+
+        expect(result!).toBeFalsy();
+
+        router.verify(x => x.navigate([state.url, MathHelper.EMPTY_GUID]), Times.once());
+    });
 });