test(core): add tests for nested transient structures

integration/scopes/e2e/transient-scope.spec.ts

@@ -1,4 +1,4 @@
-import { INestApplication, Scope } from '@nestjs/common';
+import { INestApplication, Injectable, Scope } from '@nestjs/common';
 import { Test } from '@nestjs/testing';
 import { expect } from 'chai';
 import * as request from 'supertest';
@@ -17,65 +17,126 @@ class Meta {
 }
 
 describe('Transient scope', () => {
-  let server;
-  let app: INestApplication;
+  describe('when transient scope is used', () => {
+    let server: any;
+    let app: INestApplication;
 
-  before(async () => {
-    const module = await Test.createTestingModule({
-      imports: [
-        HelloModule.forRoot({
-          provide: 'META',
-          useClass: Meta,
-          scope: Scope.TRANSIENT,
-        }),
-      ],
-    }).compile();
-
-    app = module.createNestApplication();
-    server = app.getHttpServer();
-    await app.init();
-  });
-
-  describe('when one service is request scoped', () => {
     before(async () => {
-      const performHttpCall = end =>
-        request(server)
-          .get('/hello')
-          .end(err => {
-            if (err) return end(err);
-            end();
-          });
-      await new Promise<any>(resolve => performHttpCall(resolve));
-      await new Promise<any>(resolve => performHttpCall(resolve));
-      await new Promise<any>(resolve => performHttpCall(resolve));
+      const module = await Test.createTestingModule({
+        imports: [
+          HelloModule.forRoot({
+            provide: 'META',
+            useClass: Meta,
+            scope: Scope.TRANSIENT,
+          }),
+        ],
+      }).compile();
+
+      app = module.createNestApplication();
+      server = app.getHttpServer();
+      await app.init();
     });
 
-    it(`should create controller for each request`, () => {
-      expect(HelloController.COUNTER).to.be.eql(3);
+    describe('and when one service is request scoped', () => {
+      before(async () => {
+        const performHttpCall = end =>
+          request(server)
+            .get('/hello')
+            .end(err => {
+              if (err) return end(err);
+              end();
+            });
+        await new Promise<any>(resolve => performHttpCall(resolve));
+        await new Promise<any>(resolve => performHttpCall(resolve));
+        await new Promise<any>(resolve => performHttpCall(resolve));
+      });
+
+      it(`should create controller for each request`, () => {
+        expect(HelloController.COUNTER).to.be.eql(3);
+      });
+
+      it(`should create service for each request`, () => {
+        expect(UsersService.COUNTER).to.be.eql(3);
+      });
+
+      it(`should create provider for each inquirer`, () => {
+        expect(Meta.COUNTER).to.be.eql(7);
+      });
+
+      it(`should create transient pipe for each controller (3 requests, 1 static)`, () => {
+        expect(UserByIdPipe.COUNTER).to.be.eql(4);
+      });
+
+      it(`should create transient interceptor for each controller (3 requests, 1 static)`, () => {
+        expect(Interceptor.COUNTER).to.be.eql(4);
+      });
+
+      it(`should create transient guard for each controller (3 requests, 1 static)`, () => {
+        expect(Guard.COUNTER).to.be.eql(4);
+      });
     });
 
-    it(`should create service for each request`, () => {
-      expect(UsersService.COUNTER).to.be.eql(3);
-    });
-
-    it(`should create provider for each inquirer`, () => {
-      expect(Meta.COUNTER).to.be.eql(7);
-    });
-
-    it(`should create transient pipe for each controller (3 requests, 1 static)`, () => {
-      expect(UserByIdPipe.COUNTER).to.be.eql(4);
-    });
-
-    it(`should create transient interceptor for each controller (3 requests, 1 static)`, () => {
-      expect(Interceptor.COUNTER).to.be.eql(4);
-    });
-
-    it(`should create transient guard for each controller (3 requests, 1 static)`, () => {
-      expect(Guard.COUNTER).to.be.eql(4);
+    after(async () => {
+      await app.close();
     });
   });
 
-  after(async () => {
-    await app.close();
+  describe('when there is a nested structure of transient providers', () => {
+    let app: INestApplication;
+
+    @Injectable({ scope: Scope.TRANSIENT })
+    class DeepTransient {
+      public initialized = false;
+
+      constructor() {
+        this.initialized = true;
+      }
+    }
+
+    @Injectable({ scope: Scope.TRANSIENT })
+    class LoggerService {
+      public context?: string;
+    }
+
+    @Injectable({ scope: Scope.TRANSIENT })
+    class SecondService {
+      constructor(public readonly loggerService: LoggerService) {
+        this.loggerService.context = 'SecondService';
+      }
+    }
+
+    @Injectable()
+    class FirstService {
+      constructor(
+        public readonly secondService: SecondService,
+        public readonly loggerService: LoggerService,
+        public readonly deepTransient: DeepTransient,
+      ) {
+        this.loggerService.context = 'FirstService';
+      }
+    }
+
+    before(async () => {
+      const module = await Test.createTestingModule({
+        providers: [FirstService, SecondService, LoggerService, DeepTransient],
+      }).compile();
+
+      app = module.createNestApplication();
+      await app.init();
+    });
+
+    it('should create a new instance of the transient provider for each provider', async () => {
+      const firstService1 = app.get(FirstService);
+
+      expect(firstService1.secondService.loggerService.context).to.equal(
+        'SecondService',
+      );
+      expect(firstService1.loggerService.context).to.equal('FirstService');
+      expect(firstService1.deepTransient.initialized).to.be.true;
+    });
+
+    after(async () => {
+      await app.close();
+    });
   });
 });