language blueprint fails during unit test

[dwarakaprasad]

Overview of the issue

A language blueprint fails while running the unit test with the following,

 FAIL  generators/languages/generator.spec.js > SubGenerator languages of lnfix JHipster blueprint > run
TypeError: this.composedBlueprints is not iterable
 ❯ default.validateSupportedLanguages ../../../generator-jhipster/dist/generators/languages/generator.js:94:46
 ❯ default.executeTask ../../../generator-jhipster/node_modules/yeoman-generator/dist/actions/lifecycle.js:244:26
 ❯ env.queueTask.once ../../../generator-jhipster/node_modules/yeoman-generator/dist/actions/lifecycle.js:218:56
 ❯ runLoop.add.once ../../../generator-jhipster/node_modules/yeoman-environment/dist/environment-base.js:393:23
 ❯ Immediate.<anonymous> ../../../generator-jhipster/node_modules/grouped-queue/lib/subqueue.js:48:34

Motivation for or Use Case

It should be possible to customize language generator through language blueprint.

Reproduce the error

Use the .yo-rc.json file and run the following command in the same folder as the json file.

jhipster generate-blueprint

Related issues

None

Suggest a Fix

Initialize composedBlueprints; with an empty array;
reference

JHipster Version(s)

8.1.0

JHipster configuration

.yo-rc.json file

{
  "generator-jhipster": {
    "additionalSubGenerators": "",
    "baseName": "lnfix",
    "cli": true,
    "entities": [],
    "generators": {
      "languages": {
        "command": true,
        "priorities": [
          "initializing",
          "prompting",
          "configuring",
          "composing",
          "loading",
          "preparing",
          "configuringEachEntity",
          "loadingEntities",
          "preparingEachEntity",
          "preparingEachEntityField",
          "preparingEachEntityRelationship",
          "postPreparingEachEntity",
          "default",
          "writing",
          "writingEntities",
          "postWriting",
          "postWritingEntities",
          "loadingTranslations",
          "install",
          "postInstall",
          "end"
        ],
        "sbs": false,
        "written": true
      }
    },
    "jhipsterVersion": "8.1.0",
    "localBlueprint": false,
    "sampleWritten": true,
    "subGenerators": [
      "languages"
    ]
  }
}

Environment and Tools

Picked up JAVA_TOOL_OPTIONS: -Xmx3489m
openjdk version "19.0.2" 2023-01-17
OpenJDK Runtime Environment (build 19.0.2+7-44)
OpenJDK 64-Bit Server VM (build 19.0.2+7-44, mixed mode, sharing)

git version 2.43.0

node: v20.10.0
npm: 10.2.3

Docker version 24.0.7, build afdd53b

JDL for the Entity configuration(s) entityName.json files generated in the .jhipster directory

JDL entity definitions

Entity configuration(s) entityName.json files generated in the .jhipster directory

Browsers and Operating System

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