diff --git a/lib/index.ts b/lib/index.ts
index 418168e1581a..3aa6f9620427 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -6,17 +6,17 @@ const __filename = fileURLToPath(import.meta.url);
 const __dirname = dirname(__filename);
 
 export const isDistFolder = () => {
-  return basename(join(__dirname, '..')) === 'dist';
+  return basename(dirname(__dirname)) === 'dist';
 };
 
 export const getPackageRoot = (relativePath?: string) => {
-  const sourceRoot = join(__dirname, '..');
-  const packageDirectory = isDistFolder() ? join(sourceRoot, '..') : sourceRoot;
+  const sourceRoot = dirname(__dirname);
+  const packageDirectory = isDistFolder() ? dirname(sourceRoot) : sourceRoot;
   return relativePath ? join(packageDirectory, relativePath) : packageDirectory;
 };
 
-export const getGeneratorsParentPath = (relativePath?: string) => {
-  const sourceRoot = join(__dirname, '..');
+export const getSourceRoot = (relativePath?: string) => {
+  const sourceRoot = dirname(__dirname);
   return relativePath ? join(sourceRoot, relativePath) : sourceRoot;
 };
 
diff --git a/lib/testing/__snapshots__/helpers.spec.ts.snap b/lib/testing/__snapshots__/helpers.spec.ts.snap
index 5634e66167a6..eb662d922656 100644
--- a/lib/testing/__snapshots__/helpers.spec.ts.snap
+++ b/lib/testing/__snapshots__/helpers.spec.ts.snap
@@ -1,6 +1,168 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`helpers defaults should register jhipster generators namespaces 1`] = `
+exports[`helpers run using withJHipsterGenerators should register jhipster generators namespaces 1`] = `
+[
+  "jhipster:angular",
+  "jhipster:app",
+  "jhipster:base",
+  "jhipster:base-application",
+  "jhipster:base-core",
+  "jhipster:base-entity-changes",
+  "jhipster:base-workspaces",
+  "jhipster:bootstrap",
+  "jhipster:bootstrap-application",
+  "jhipster:bootstrap-application-base",
+  "jhipster:bootstrap-application-client",
+  "jhipster:bootstrap-application-server",
+  "jhipster:bootstrap-workspaces",
+  "jhipster:ci-cd",
+  "jhipster:client",
+  "jhipster:client:common",
+  "jhipster:common",
+  "jhipster:cucumber",
+  "jhipster:cypress",
+  "jhipster:docker",
+  "jhipster:docker-compose",
+  "jhipster:entities",
+  "jhipster:entity",
+  "jhipster:export-jdl",
+  "jhipster:feign-client",
+  "jhipster:gatling",
+  "jhipster:generate-blueprint",
+  "jhipster:git",
+  "jhipster:gradle",
+  "jhipster:gradle:code-quality",
+  "jhipster:gradle:jib",
+  "jhipster:gradle:node-gradle",
+  "jhipster:heroku",
+  "jhipster:info",
+  "jhipster:init",
+  "jhipster:java",
+  "jhipster:java:bootstrap",
+  "jhipster:java:build-tool",
+  "jhipster:java:code-quality",
+  "jhipster:java:domain",
+  "jhipster:java:jib",
+  "jhipster:java:node",
+  "jhipster:java:openapi-generator",
+  "jhipster:javascript:bootstrap",
+  "jhipster:javascript:eslint",
+  "jhipster:javascript:husky",
+  "jhipster:javascript:prettier",
+  "jhipster:jdl",
+  "jhipster:kubernetes",
+  "jhipster:kubernetes-helm",
+  "jhipster:kubernetes-knative",
+  "jhipster:languages",
+  "jhipster:liquibase",
+  "jhipster:maven",
+  "jhipster:maven:code-quality",
+  "jhipster:maven:frontend-plugin",
+  "jhipster:maven:jib",
+  "jhipster:project-name",
+  "jhipster:react",
+  "jhipster:server",
+  "jhipster:spring-boot",
+  "jhipster:spring-cache",
+  "jhipster:spring-cloud-stream",
+  "jhipster:spring-cloud-stream:kafka",
+  "jhipster:spring-cloud-stream:pulsar",
+  "jhipster:spring-cloud:gateway",
+  "jhipster:spring-data-cassandra",
+  "jhipster:spring-data-couchbase",
+  "jhipster:spring-data-elasticsearch",
+  "jhipster:spring-data-mongodb",
+  "jhipster:spring-data-neo4j",
+  "jhipster:spring-data-relational",
+  "jhipster:spring-websocket",
+  "jhipster:upgrade",
+  "jhipster:vue",
+  "jhipster:workspaces",
+]
+`;
+
+exports[`helpers runJHipster defaults should register jhipster generators namespaces 1`] = `
+[
+  "jhipster:angular",
+  "jhipster:app",
+  "jhipster:base",
+  "jhipster:base-application",
+  "jhipster:base-core",
+  "jhipster:base-entity-changes",
+  "jhipster:base-workspaces",
+  "jhipster:bootstrap",
+  "jhipster:bootstrap-application",
+  "jhipster:bootstrap-application-base",
+  "jhipster:bootstrap-application-client",
+  "jhipster:bootstrap-application-server",
+  "jhipster:bootstrap-workspaces",
+  "jhipster:ci-cd",
+  "jhipster:client",
+  "jhipster:client:common",
+  "jhipster:common",
+  "jhipster:cucumber",
+  "jhipster:cypress",
+  "jhipster:docker",
+  "jhipster:docker-compose",
+  "jhipster:entities",
+  "jhipster:entity",
+  "jhipster:export-jdl",
+  "jhipster:feign-client",
+  "jhipster:gatling",
+  "jhipster:generate-blueprint",
+  "jhipster:git",
+  "jhipster:gradle",
+  "jhipster:gradle:code-quality",
+  "jhipster:gradle:jib",
+  "jhipster:gradle:node-gradle",
+  "jhipster:heroku",
+  "jhipster:info",
+  "jhipster:init",
+  "jhipster:java",
+  "jhipster:java:bootstrap",
+  "jhipster:java:build-tool",
+  "jhipster:java:code-quality",
+  "jhipster:java:domain",
+  "jhipster:java:jib",
+  "jhipster:java:node",
+  "jhipster:java:openapi-generator",
+  "jhipster:javascript:bootstrap",
+  "jhipster:javascript:eslint",
+  "jhipster:javascript:husky",
+  "jhipster:javascript:prettier",
+  "jhipster:jdl",
+  "jhipster:kubernetes",
+  "jhipster:kubernetes-helm",
+  "jhipster:kubernetes-knative",
+  "jhipster:languages",
+  "jhipster:liquibase",
+  "jhipster:maven",
+  "jhipster:maven:code-quality",
+  "jhipster:maven:frontend-plugin",
+  "jhipster:maven:jib",
+  "jhipster:project-name",
+  "jhipster:react",
+  "jhipster:server",
+  "jhipster:spring-boot",
+  "jhipster:spring-cache",
+  "jhipster:spring-cloud-stream",
+  "jhipster:spring-cloud-stream:kafka",
+  "jhipster:spring-cloud-stream:pulsar",
+  "jhipster:spring-cloud:gateway",
+  "jhipster:spring-data-cassandra",
+  "jhipster:spring-data-couchbase",
+  "jhipster:spring-data-elasticsearch",
+  "jhipster:spring-data-mongodb",
+  "jhipster:spring-data-neo4j",
+  "jhipster:spring-data-relational",
+  "jhipster:spring-websocket",
+  "jhipster:upgrade",
+  "jhipster:vue",
+  "jhipster:workspaces",
+]
+`;
+
+exports[`helpers runJHipster with useDefaultMocks should register jhipster generators namespaces 1`] = `
 [
   "jhipster:angular",
   "jhipster:app",
diff --git a/lib/testing/helpers.spec.ts b/lib/testing/helpers.spec.ts
index 90d4244529c7..d51c8a086a6f 100644
--- a/lib/testing/helpers.spec.ts
+++ b/lib/testing/helpers.spec.ts
@@ -1,12 +1,50 @@
 import { before, describe, expect, it } from 'esmocha';
 import { defaultHelpers as helpers, runResult } from './helpers.js';
 
-const DUMMY_NAMESPACE = 'dummy';
+const DUMMY_NAMESPACE = 'jhipster:dummy';
 
 describe('helpers', () => {
-  describe('defaults', () => {
+  describe('run defaults', () => {
     before(async () => {
-      await helpers.runJHipster('info');
+      await helpers.run(helpers.createDummyGenerator(), { namespace: DUMMY_NAMESPACE });
+    });
+    it('should register not jhipster generators namespaces', () => {
+      expect(
+        Object.keys(runResult.env.store._meta)
+          .filter(ns => ns !== DUMMY_NAMESPACE)
+          .sort(),
+      ).toHaveLength(0);
+    });
+  });
+  describe('runJHipster defaults', () => {
+    before(async () => {
+      await helpers.runJHipster('dummy').withGenerators([[helpers.createDummyGenerator(), { namespace: DUMMY_NAMESPACE }]]);
+    });
+    it('should register jhipster generators namespaces', () => {
+      expect(
+        Object.keys(runResult.env.store._meta)
+          .filter(ns => ns !== DUMMY_NAMESPACE)
+          .sort(),
+      ).toMatchSnapshot();
+    });
+  });
+  describe('run using withJHipsterGenerators', () => {
+    before(async () => {
+      await helpers.run(helpers.createDummyGenerator(), { namespace: DUMMY_NAMESPACE }).withJHipsterGenerators();
+    });
+    it('should register jhipster generators namespaces', () => {
+      expect(
+        Object.keys(runResult.env.store._meta)
+          .filter(ns => ns !== DUMMY_NAMESPACE)
+          .sort(),
+      ).toMatchSnapshot();
+    });
+  });
+  describe('runJHipster with useDefaultMocks', () => {
+    before(async () => {
+      await helpers
+        .runJHipster('dummy', { useDefaultMocks: true })
+        .withGenerators([[helpers.createDummyGenerator(), { namespace: DUMMY_NAMESPACE }]]);
     });
     it('should register jhipster generators namespaces', () => {
       expect(
diff --git a/lib/testing/helpers.ts b/lib/testing/helpers.ts
index 4faf9b2ffc16..9185eff065e8 100644
--- a/lib/testing/helpers.ts
+++ b/lib/testing/helpers.ts
@@ -13,7 +13,7 @@ import { GENERATOR_WORKSPACES } from '../../generators/generator-list.js';
 import { createJHipsterLogger, normalizePathEnd, parseCreationTimestamp } from '../../generators/base/support/index.js';
 import BaseGenerator from '../../generators/base/index.js';
 import type { JHipsterGeneratorOptions } from '../../generators/base/api.js';
-import { getPackageRoot, isDistFolder } from '../index.js';
+import { getPackageRoot, getSourceRoot, isDistFolder } from '../index.js';
 import type CoreGenerator from '../../generators/base-core/generator.js';
 import type { ApplicationConfiguration } from '../types/application/yo-rc.js';
 import { getDefaultJDLApplicationConfig } from '../command/jdl.js';
@@ -66,7 +66,8 @@ const DEFAULT_TEST_SETTINGS = { forwardCwd: true };
 const DEFAULT_TEST_OPTIONS = { skipInstall: true };
 const DEFAULT_TEST_ENV_OPTIONS = { skipInstall: true, dryRun: false };
 
-const generatorsDir = join(getPackageRoot(), 'generators');
+const toJHipsterNamespace = (ns: string) => (/^jhipster[:-]/.test(ns) ? ns : `jhipster:${ns}`);
+const generatorsDir = getSourceRoot('generators');
 const allGenerators = [
   ...globSync('*/index.{j,t}s', { cwd: generatorsDir, posix: true }).map(file => dirname(file)),
   ...globSync('*/generators/*/index.{j,t}s', { cwd: generatorsDir, posix: true }).map(file => dirname(file).replace('/generators/', ':')),
@@ -325,7 +326,7 @@ class JHipsterRunContext extends RunContext<GeneratorTestType> {
   withMockedJHipsterGenerators(options: string[] | { except?: string[]; filter?: (string) => boolean } = {}): this {
     const optionsObj = Array.isArray(options) ? { except: options } : options;
     const { except = [], filter = filterBootstrapGenerators } = optionsObj;
-    const jhipsterExceptList = except.map(gen => (gen.startsWith('jhipster:') ? gen : `jhipster:${gen}`));
+    const jhipsterExceptList = except.map(toJHipsterNamespace);
     return this.withMockedGenerators(
       allGenerators.filter(filter).filter(gen => !jhipsterExceptList.includes(gen) && (this as any).Generator !== gen),
     );
@@ -333,7 +334,7 @@ class JHipsterRunContext extends RunContext<GeneratorTestType> {
 
   withJHipsterGenerators(options: WithJHipsterGenerators = {}): this {
     const { useDefaultMocks, actualGeneratorsList = [], useMock = useDefaultMocks ? filterBootstrapGenerators : () => false } = options;
-    const jhipsterExceptList = actualGeneratorsList.map(gen => (gen.startsWith('jhipster:') ? gen : `jhipster:${gen}`));
+    const jhipsterExceptList = actualGeneratorsList.map(toJHipsterNamespace);
     const mockedGenerators = allGenerators
       .filter(useMock)
       .filter(gen => !jhipsterExceptList.includes(gen) && (this as any).Generator !== gen);
@@ -345,6 +346,7 @@ class JHipsterRunContext extends RunContext<GeneratorTestType> {
       // @ts-expect-error lookups is not exported
       lookups: [`${prefix}generators`, `${prefix}generators/*/generators`],
       filePatterns,
+      customizeNamespace: ns => ns?.replaceAll(':generators:', ':'),
     });
   }
 
@@ -409,7 +411,7 @@ plugins {
     runResult.composedMockedGenerators = composedGeneratorsToCheck.filter(gen => runResult.mockedGenerators[gen]?.mock.callCount() > 0);
 
     runResult.createJHipster = (ns: string, options?: WithJHipsterGenerators) => {
-      ns = ns.startsWith('jhipster:') ? ns : `jhipster:${ns}`;
+      ns = toJHipsterNamespace(ns);
       const context = runResult.create(ns) as JHipsterRunContext;
       return context.withJHipsterGenerators(options);
     };
@@ -451,7 +453,7 @@ class JHipsterTest extends YeomanTest {
     envOptions?: BaseEnvironmentOptions | undefined,
   ): JHipsterRunContext {
     if (!isAbsolute(jhipsterGenerator)) {
-      jhipsterGenerator = jhipsterGenerator.startsWith('jhipster:') ? jhipsterGenerator : `jhipster:${jhipsterGenerator}`;
+      jhipsterGenerator = toJHipsterNamespace(jhipsterGenerator);
     }
     const isWithJHipsterGenerators = (opt: any): opt is WithJHipsterGenerators | undefined =>
       opt === undefined || 'actualGeneratorsList' in opt || 'useMock' in opt || 'useDefaultMocks' in opt || 'useEnvironmentBuilder' in opt;