test(sample-02): added unit tests

sample/02-gateways/jest.json

@@ -0,0 +1,14 @@
+{
+  "moduleFileExtensions": [
+        "ts",
+        "tsx",
+        "js",
+        "json"
+    ],
+    "transform": {
+        "^.+\\.tsx?$": "ts-jest"
+    },
+    "testRegex": "/src/.*\\.(test|spec).(ts|tsx|js)$",
+    "collectCoverageFrom" : ["src/**/*.{js,jsx,tsx,ts}", "!**/node_modules/**", "!**/vendor/**"],
+    "coverageReporters": ["json", "lcov"]
+}

sample/02-gateways/package-lock.json

@@ -27,6 +27,7 @@
         "@nestjs/schematics": "9.0.1",
         "@nestjs/testing": "9.0.1",
         "@types/express": "4.17.13",
+        "@types/jest": "^28.1.4",
         "@types/node": "18.0.3",
         "@types/supertest": "2.0.12",
         "@types/ws": "8.5.3",
@@ -1947,6 +1948,16 @@
         "@types/istanbul-lib-report": "*"
       }
     },
+    "node_modules/@types/jest": {
+      "version": "28.1.4",
+      "resolved": "https://registry.npmjs.org/@types/jest/-/jest-28.1.4.tgz",
+      "integrity": "sha512-telv6G5N7zRJiLcI3Rs3o+ipZ28EnE+7EvF0pSrt2pZOMnAVI/f+6/LucDxOvcBcTeTL3JMF744BbVQAVBUQRA==",
+      "dev": true,
+      "dependencies": {
+        "jest-matcher-utils": "^28.0.0",
+        "pretty-format": "^28.0.0"
+      }
+    },
     "node_modules/@types/json-schema": {
       "version": "7.0.11",
       "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.11.tgz",
@@ -10166,6 +10177,16 @@
         "@types/istanbul-lib-report": "*"
       }
     },
+    "@types/jest": {
+      "version": "28.1.4",
+      "resolved": "https://registry.npmjs.org/@types/jest/-/jest-28.1.4.tgz",
+      "integrity": "sha512-telv6G5N7zRJiLcI3Rs3o+ipZ28EnE+7EvF0pSrt2pZOMnAVI/f+6/LucDxOvcBcTeTL3JMF744BbVQAVBUQRA==",
+      "dev": true,
+      "requires": {
+        "jest-matcher-utils": "^28.0.0",
+        "pretty-format": "^28.0.0"
+      }
+    },
     "@types/json-schema": {
       "version": "7.0.11",
       "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.11.tgz",
@@ -10577,9 +10598,7 @@
       "resolved": "https://registry.npmjs.org/ajv-formats/-/ajv-formats-2.1.1.tgz",
       "integrity": "sha512-Wx0Kx52hxE7C18hkMEggYlEifqWZtYaRgouJor+WMdPnQyEK13vgEWyVNup7SoeeoLMsr4kf5h6dOW11I15MUA==",
       "dev": true,
-      "requires": {
-        "ajv": "^8.0.0"
-      }
+      "requires": {}
     },
     "ansi-colors": {
       "version": "4.1.1",

sample/02-gateways/package.json

@@ -37,6 +37,7 @@
     "@nestjs/schematics": "9.0.1",
     "@nestjs/testing": "9.0.1",
     "@types/express": "4.17.13",
+    "@types/jest": "^28.1.4",
     "@types/node": "18.0.3",
     "@types/supertest": "2.0.12",
     "@types/ws": "8.5.3",
@@ -54,5 +55,22 @@
     "ts-node": "10.8.2",
     "tsconfig-paths": "4.0.0",
     "typescript": "4.7.4"
+  },
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "json",
+      "ts"
+    ],
+    "rootDir": "src",
+    "testRegex": ".*\\.spec\\.ts$",
+    "transform": {
+      "^.+\\.(t|j)s$": "ts-jest"
+    },
+    "collectCoverageFrom": [
+      "**/*.(t|j)s"
+    ],
+    "coverageDirectory": "../coverage",
+    "testEnvironment": "node"
   }
 }

sample/02-gateways/src/events/events.gateway.spec.ts

@@ -0,0 +1,40 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { reduce } from 'rxjs/operators';
+import { EventsGateway } from './events.gateway';
+
+describe('EventsGateway', () => {
+  let gateway: EventsGateway;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [EventsGateway],
+    }).compile();
+
+    gateway = module.get<EventsGateway>(EventsGateway);
+  });
+
+  it('should be defined', () => {
+    expect(gateway).toBeDefined();
+  });
+
+  describe('findAll', () => {
+    it('should return an array of items', done => {
+      gateway
+        .findAll({})
+        .pipe(reduce((acc, item) => [...acc, item], []))
+        .subscribe(results => {
+          expect(results.length).toBe(3);
+          results.forEach((result, index) =>
+            expect(result.data).toBe(index + 1),
+          );
+          done();
+        });
+    });
+  });
+
+  describe('identity', () => {
+    it('should return the same number has what was sent', async () => {
+      await expect(gateway.identity(1)).resolves.toBe(1);
+    });
+  });
+});