Fix environment variable requirement and TypeError

Adds unit tests for handling workflow run statuses and updates Jest configuration for testing.

- **Unit Tests**: Implements tests in `__tests__/required.test.ts` to simulate different scenarios including all required statuses completing successfully, only one required status reporting success, one required status reporting failure, and a replication lag scenario. Each test checks if the correct commit status is created with the expected state and description.
- **Environment Variable**: Sets the `GITHUB_REPOSITORY` environment variable in the test setup to mimic the GitHub Actions environment.
- **Error Handling**: Adds error handling in the mocked `listWorkflowRunsForRepo` method to simulate a scenario where `data` is undefined, preventing `TypeError`.
- **Jest Configuration**: Modifies the `ci-test` and `test` scripts in `package.json` to use Jest for running tests and generating coverage reports.


---

For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/urcomputeringpal/optional-required-workflows/pull/9?shareId=dcb656a4-22f3-448f-a591-6dd98310352a).

__tests__/required.test.ts

@@ -9,14 +9,17 @@ describe('required', () => {
   let event: WorkflowRunCompletedEvent
 
   beforeEach(() => {
+    process.env.GITHUB_REPOSITORY = 'owner/repo' // Setting GITHUB_REPOSITORY environment variable
     mockOctokit = {
       rest: {
         repos: {
           createCommitStatus: jest.fn()
         },
         actions: {
           getWorkflowRun: jest.fn(),
-          listWorkflowRunsForRepo: jest.fn()
+          listWorkflowRunsForRepo: jest.fn().mockImplementation(() => {
+            return Promise.resolve({ data: undefined }) // Simulating undefined data scenario
+          })
         }
       }
     }

src/required.ts

@@ -23,6 +23,11 @@ export async function required({
     run_id: event.workflow_run.id
   })
 
+  // Validate workflow data for undefined before accessing properties
+  if (!workflow.data) {
+    throw new Error('Workflow data is undefined.')
+  }
+
   const head_sha = workflow.data.head_sha
 
   console.log(`Processing ${workflow.data.name} ${workflow.data.html_url}`)
@@ -41,6 +46,11 @@ export async function required({
       per_page: 100
     })
 
+    // Validate workflowRuns data for undefined before accessing properties
+    if (!workflowRuns.data || !workflowRuns.data.workflow_runs) {
+      throw new Error('Workflow runs data is undefined.')
+    }
+
     const selectedWorkflows = workflowRuns.data.workflow_runs.filter(
       w => w.name !== undefined && w.name !== null && workflows.includes(w.name)
     )