diff --git a/packages/microservices/errors/invalid-grpc-package-definition-missing-package-definition.exception.ts b/packages/microservices/errors/invalid-grpc-package-definition-missing-package-definition.exception.ts
index 40ce6854c07..c5483358ec2 100644
--- a/packages/microservices/errors/invalid-grpc-package-definition-missing-package-definition.exception.ts
+++ b/packages/microservices/errors/invalid-grpc-package-definition-missing-package-definition.exception.ts
@@ -1,7 +1,9 @@
 import { RuntimeException } from '@nestjs/core/errors/exceptions/runtime.exception';
 
-export class InvalidGrpcPackageDefinitionMissingPacakgeDefinitionException extends RuntimeException {
+export class InvalidGrpcPackageDefinitionMissingPackageDefinitionException extends RuntimeException {
   constructor() {
-    super('protoPath or packageDefinition must be defined');
+    super(
+      `Invalid gRPC configuration. protoPath or packageDefinition must be defined.`,
+    );
   }
 }
diff --git a/packages/microservices/errors/invalid-grpc-package-definition-mutex.exception.ts b/packages/microservices/errors/invalid-grpc-package-definition-mutex.exception.ts
index 8720b688acb..baa4f8be71f 100644
--- a/packages/microservices/errors/invalid-grpc-package-definition-mutex.exception.ts
+++ b/packages/microservices/errors/invalid-grpc-package-definition-mutex.exception.ts
@@ -3,7 +3,7 @@ import { RuntimeException } from '@nestjs/core/errors/exceptions/runtime.excepti
 export class InvalidGrpcPackageDefinitionMutexException extends RuntimeException {
   constructor() {
     super(
-      'Both protoPath and packageDefinition were provided, but only one can be defined',
+      `Invalid gRPC configuration. Both protoPath and packageDefinition cannot be defined at the same time.`,
     );
   }
 }
diff --git a/packages/microservices/helpers/grpc-helpers.ts b/packages/microservices/helpers/grpc-helpers.ts
index b1d6460a415..56bf9ad2463 100644
--- a/packages/microservices/helpers/grpc-helpers.ts
+++ b/packages/microservices/helpers/grpc-helpers.ts
@@ -1,6 +1,6 @@
-import { GrpcOptions } from '../interfaces';
+import { InvalidGrpcPackageDefinitionMissingPackageDefinitionException } from '../errors/invalid-grpc-package-definition-missing-package-definition.exception';
 import { InvalidGrpcPackageDefinitionMutexException } from '../errors/invalid-grpc-package-definition-mutex.exception';
-import { InvalidGrpcPackageDefinitionMissingPacakgeDefinitionException } from '../errors/invalid-grpc-package-definition-missing-package-definition.exception';
+import { GrpcOptions } from '../interfaces';
 
 export function getGrpcPackageDefinition(
   options: GrpcOptions['options'],
@@ -9,12 +9,11 @@ export function getGrpcPackageDefinition(
   const file = options['protoPath'];
   const packageDefinition = options['packageDefinition'];
 
-  if ([file, packageDefinition].every(x => x != undefined)) {
+  if (file && packageDefinition) {
     throw new InvalidGrpcPackageDefinitionMutexException();
   }
-
-  if ([file, packageDefinition].every(x => x == undefined)) {
-    throw new InvalidGrpcPackageDefinitionMissingPacakgeDefinitionException();
+  if (!file && !packageDefinition) {
+    throw new InvalidGrpcPackageDefinitionMissingPackageDefinitionException();
   }
 
   return (
diff --git a/packages/microservices/server/server-grpc.ts b/packages/microservices/server/server-grpc.ts
index c097d44a210..fbcc280efd0 100644
--- a/packages/microservices/server/server-grpc.ts
+++ b/packages/microservices/server/server-grpc.ts
@@ -23,10 +23,10 @@ import { Transport } from '../enums';
 import { InvalidGrpcPackageException } from '../errors/invalid-grpc-package.exception';
 import { InvalidProtoDefinitionException } from '../errors/invalid-proto-definition.exception';
 import { ChannelOptions } from '../external/grpc-options.interface';
+import { getGrpcPackageDefinition } from '../helpers';
 import { CustomTransportStrategy, MessageHandler } from '../interfaces';
 import { GrpcOptions } from '../interfaces/microservice-configuration.interface';
 import { Server } from './server';
-import { getGrpcPackageDefinition } from '../helpers';
 
 let grpcPackage: any = {};
 let grpcProtoLoaderPackage: any = {};
diff --git a/packages/microservices/test/helpers/grpc-helpers.spec.ts b/packages/microservices/test/helpers/grpc-helpers.spec.ts
index 4348ecb5922..e8844a1f9dd 100644
--- a/packages/microservices/test/helpers/grpc-helpers.spec.ts
+++ b/packages/microservices/test/helpers/grpc-helpers.spec.ts
@@ -1,56 +1,64 @@
 import { expect } from 'chai';
-import { getGrpcPackageDefinition } from '../../helpers/grpc-helpers';
+import { InvalidGrpcPackageDefinitionMissingPackageDefinitionException } from '../../errors/invalid-grpc-package-definition-missing-package-definition.exception';
 import { InvalidGrpcPackageDefinitionMutexException } from '../../errors/invalid-grpc-package-definition-mutex.exception';
-import { InvalidGrpcPackageDefinitionMissingPacakgeDefinitionException } from '../../errors/invalid-grpc-package-definition-missing-package-definition.exception';
+import { getGrpcPackageDefinition } from '../../helpers/grpc-helpers';
 
 const grpcProtoLoaderPackage = { loadSync: (a, b) => 'withLoader' };
 
 describe('getGrpcPackageDefinition', () => {
-  it('missing both protoPath and packageDefinition', () => {
-    expect(() =>
-      getGrpcPackageDefinition(
-        {
-          package: 'somePackage',
-        },
-        grpcProtoLoaderPackage,
-      ),
-    ).to.throw(InvalidGrpcPackageDefinitionMissingPacakgeDefinitionException);
+  describe('when missing both protoPath and packageDefinition', () => {
+    it('should throw InvalidGrpcPackageDefinitionMissingPackageDefinitionException', () => {
+      expect(() =>
+        getGrpcPackageDefinition(
+          {
+            package: 'somePackage',
+          },
+          grpcProtoLoaderPackage,
+        ),
+      ).to.throw(InvalidGrpcPackageDefinitionMissingPackageDefinitionException);
+    });
   });
 
-  it('got both protoPath and packageDefinition', () => {
-    expect(() =>
-      getGrpcPackageDefinition(
-        {
-          package: 'somePackage',
-          protoPath: 'some/path',
-          packageDefinition: {},
-        },
-        grpcProtoLoaderPackage,
-      ),
-    ).to.throw(InvalidGrpcPackageDefinitionMutexException);
+  describe('when both protoPath and packageDefinition are defined', () => {
+    it('should throw InvalidGrpcPackageDefinitionMutexException', () => {
+      expect(() =>
+        getGrpcPackageDefinition(
+          {
+            package: 'somePackage',
+            protoPath: 'some/path',
+            packageDefinition: {},
+          },
+          grpcProtoLoaderPackage,
+        ),
+      ).to.throw(InvalidGrpcPackageDefinitionMutexException);
+    });
   });
 
-  it('success with protoPath', () => {
-    expect(() =>
-      getGrpcPackageDefinition(
-        {
-          package: 'somePackage',
-          protoPath: 'some/path',
-        },
-        grpcProtoLoaderPackage,
-      ),
-    ).to.not.throw(Error);
+  describe('when only protoPath is defined', () => {
+    it('should not throw any exception', () => {
+      expect(() =>
+        getGrpcPackageDefinition(
+          {
+            package: 'somePackage',
+            protoPath: 'some/path',
+          },
+          grpcProtoLoaderPackage,
+        ),
+      ).to.not.throw(Error);
+    });
   });
 
-  it('success with packageDef', () => {
-    expect(() =>
-      getGrpcPackageDefinition(
-        {
-          package: 'somePackage',
-          packageDefinition: {},
-        },
-        grpcProtoLoaderPackage,
-      ),
-    ).to.not.throw(Error);
+  describe('when only packageDefinition is defined', () => {
+    it('should not throw any exception', () => {
+      expect(() =>
+        getGrpcPackageDefinition(
+          {
+            package: 'somePackage',
+            packageDefinition: {},
+          },
+          grpcProtoLoaderPackage,
+        ),
+      ).to.not.throw(Error);
+    });
   });
 });
diff --git a/packages/microservices/test/server/server-grpc.spec.ts b/packages/microservices/test/server/server-grpc.spec.ts
index 65d6b87255f..3e0fb4147cd 100644
--- a/packages/microservices/test/server/server-grpc.spec.ts
+++ b/packages/microservices/test/server/server-grpc.spec.ts
@@ -1,21 +1,14 @@
 import { Logger } from '@nestjs/common';
 import { expect } from 'chai';
 import { join } from 'path';
-import {
-  async,
-  Observable,
-  of,
-  ReplaySubject,
-  Subject,
-  throwError,
-} from 'rxjs';
+import { ReplaySubject, Subject, throwError } from 'rxjs';
 import * as sinon from 'sinon';
 import { CANCEL_EVENT } from '../../constants';
 import { InvalidGrpcPackageException } from '../../errors/invalid-grpc-package.exception';
-import { GrpcMethodStreamingType } from '../../index';
-import { ServerGrpc } from '../../server';
 import { InvalidProtoDefinitionException } from '../../errors/invalid-proto-definition.exception';
 import * as grpcHelpers from '../../helpers/grpc-helpers';
+import { GrpcMethodStreamingType } from '../../index';
+import { ServerGrpc } from '../../server';
 
 class NoopLogger extends Logger {
   log(message: any, context?: string): void {}