Show the info of one testcase

This api offers the interface to show the detailed info of one testcase.
The info of one testcase will be returned.
---
tags:
  - Testcases
parameters:
  - name: testcase_name
    description: testcase name
    in: path
    type: string
    required: true
definitions:
  Testcases:
    type: object
    properties:
      case_name:
          $ref: '#/definitions/Tests'
  Tests:
    type: dict
responses:
  200:
    description: Show the detailed info of one testcase
    schema:
      $ref: '#/definitions/Testcases'
    examples:
        "testcase": ""
        "blocking":
        "criteria":
        "dependency": {
            "installer": "",
            "scenario": ""
        }
        "description": ""
        "enabled":