[Bug]swagger-codegen-maven-plugin does mot generate api tests when the language is specified as jaxrs-spec

Description

When target generation language is specified as jaxrs-spec, it does not generate api tests. I have configured swagger-codegen-maven-plugin as follows in pom.xml.

Swagger-codegen version

3.0.23

Swagger declaration file content or url

          <plugin>
                <groupId>io.swagger.codegen.v3</groupId>
                <artifactId>swagger-codegen-maven-plugin</artifactId>
                <version>3.0.23</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <skip>false</skip>
                            <inputSpec>${project.basedir}/src/main/resources/swagger.yaml</inputSpec>
                            <language>jaxrs-spec</language>
                            <configOptions>
                                <sourceFolder>src/main/java/</sourceFolder>
                                <useGenericResponse>true</useGenericResponse>
                            </configOptions>
                            <generateApiTests>true</generateApiTests>
                            <modelPackage>org.abc.dashboard.rest.model</modelPackage>
                            <apiPackage>org.abc.dashboard.rest.api</apiPackage>
                            <output>${project.basedir}</output>
                        </configuration>
                    </execution>
                </executions>
         </plugin>

The swagger file is as below

openapi: 3.0.0
info:
  description: This is to retrieve details from the rest api to the UI.
  version: "1.0.0"
  title: Cluster Aware Dashboard
tags:
  - name: "groups"
    description: "Access group list"
paths:
  /groups:
    get:
      tags:
        - "groups"
      summary: "Get set of groups"
      operationId: "RetrieveGroups"
      responses:
        200:
          description: "The list of groups registered to dashboard"
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GroupList'
        default:
          description: Unexpected error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    GroupList:
      type: array
      items:
        type: object
        properties:
          groupId:
            type: string
          groupName:
            type: string
      example: [{groupId: group_01, groupName: dev_env}]
    Error:
      type: object
      properties:
        code:
          type: integer
        message:
          type: string
      example:
        {code: 500, message: Internal server error}    

Command line used for generation

Steps to reproduce

Related issues/PRs

Suggest a fix/enhancement

Start with the pom.xml configuration and the swagger.yaml example, then run the swagger-codegen-maven-plugin generate goal using language jaxrs-spec and generateApiTests=true. Trace the jaxrs-spec generator and its test-generation templates, comparing the generated output with the expected API tests; done means API test files are produced for the supplied specification.