refactor: throw an error when removing a non-existing plugin

Related to #2

test/app.spec.ts

@@ -102,7 +102,7 @@ export class AppPluginRegisterSpec {
   }
 
   @test
-  async 'should response with false when deleting non previously registered plugin'() {
+  async 'should response with 404 when deleting non previously registered plugin'() {
     // lets simulate that the plugin is already registered
     plugins.set(registerAddRequest.plugin.route, registerAddRequest.plugin);
 
@@ -112,7 +112,7 @@ export class AppPluginRegisterSpec {
       .set('Accept', 'application/json')
       // using a different route for the remove request
       .send({action: 'remove', route: '/not-foo'} as SCPluginRemove)
-      .expect(200, {success: false});
+      .expect(404);
   }
 }
 

test/routes/plugin-register-route.spec.ts

@@ -17,6 +17,7 @@ import {
   SCPluginAdd,
   SCPluginAlreadyRegisteredErrorResponse,
   SCPluginRemove,
+  SCNotFoundErrorResponse,
 } from '@openstapps/core';
 import {should, use} from 'chai';
 import {slow, timeout} from 'mocha-typescript';
@@ -94,17 +95,12 @@ export class PluginRegisterRouteSpec {
   }
 
   @test
-  async 'should return false when removing a plugin whose route doesn\'t exist'() {
+  async 'should throw a "not found" error when removing a plugin whose route doesn\'t exist'() {
     // register one plugin
     await pluginRegisterHandler(registerAddRequest, {});
 
-    const response = await pluginRegisterHandler({...registerRemoveRequest, route: '/not-foo'}, {});
-
-    return response.should.eql({success: false});
-
-    // TODO: use 404 response
-    // return pluginRegisterHandler({...registerRemoveRequest, route: '/bar'}, {})
-    //   .should.eventually.be.rejectedWith('Resource not found')
-    //   .and.be.an.instanceOf(SCNotFoundErrorResponse);
+    return pluginRegisterHandler({...registerRemoveRequest, route: '/not-foo'}, {})
+      .should.eventually.be.rejectedWith('Resource not found')
+      .and.be.an.instanceOf(SCNotFoundErrorResponse);
   }
 }