Added a whole structure

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+
+# Next.js build output
+.next
+
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and *not* Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+.DS_Store

.vscode/launch.json

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+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+      {
+        "type": "node",
+        "request": "launch",
+        "name": "Launch Program",
+        "program": "${workspaceFolder}/index.ts",
+        "preLaunchTask": "tsc: build - tsconfig.json",
+        "outFiles": ["${workspaceFolder}/dist/**/*.js"]
+      }
+    ]
+  }

README.md

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+#Sending JUnit report to Slack

action.yml

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+name: 'xUnit XML to Slack'
+description: 'Send xUnit-like xml report to Slack'
+branding:
+    icon: "bell"
+    color: "green"
+inputs:
+  slack-webhook-url: 
+    description: 'Webhook URL for Slack'
+    required: true
+  directory-path:
+    description: 'Directory path to JUnit XML file'
+    required: true
+runs:
+  using: 'node16'
+  main: 'dist/index.js'

app/action-info.ts

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+
+import * as github from '@actions/github';
+
+export default class ActionInfo{
+    workflowName: string;
+    runUrl: string;
+    buildUrl: string;
+    constructor(){
+        this.workflowName = github.context.workflow;
+        this.runUrl = `${github.context.serverUrl}/${github.context.repo.owner}/${github.context.repo.repo}/actions/runs/${github.context.runId}`;
+        this.buildUrl = `${github.context.serverUrl}/${github.context.repo.owner}/${github.context.repo.repo}/runs/${github.context.runNumber}`;
+    }
+}

app/results-parser.ts

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+import * as fs from 'fs';
+import { parse } from 'junit2json';
+
+class TestResult {
+  name: string;
+  status: string;
+  time: string;
+  constructor(name: string, status: string, time: string) {
+    this.name = name;
+    this.status = status;
+    this.time = time;
+  }
+}
+
+export default class ResultsParser {
+  filePath: string;
+  passedTests: number;
+  failedTests: number;
+  skippedTests: number;
+  executionTime: string;
+  failedTestsList: string[];
+  constructor(filePath: string) {
+    this.filePath = filePath;
+    this.passedTests = 0;
+    this.failedTests = 0;
+    this.skippedTests = 0;
+    this.executionTime = "";
+    this.failedTestsList = [];
+  }
+
+  async parse() {
+    const file = fs.readFileSync(this.filePath, 'utf8');
+    const output = await parse(file);
+    const timeSeconds = Math.floor(output["time"]);
+    this.executionTime = Math.floor(timeSeconds/60) + "m " + timeSeconds%60 + "s";
+    const testResults = this.extract(output["testsuite"]);
+    for (let testResult of testResults) {
+      if (testResult.status === "failed") {
+        this.failedTests++;
+        this.failedTestsList.push(testResult.name);
+      } else if (testResult.status === "skipped") {
+        this.skippedTests++;
+      } else if (testResult.status === "passed") { 
+        this.passedTests++;
+      }
+    }
+  }
+
+  private extract(testsuites): TestResult[] {
+    const testResults: TestResult[] = [];
+    for (let suite of testsuites) {
+      for (let test of suite["testcase"]){
+        const testName = test["name"];
+        const testTime = test["time"];
+        const testStatus = this.getTestStatus(test);
+        testResults.push(new TestResult(testName, testStatus, testTime));
+      }
+    }
+    return testResults;
+  }
+
+  private getTestStatus(testJson){
+    if(testJson["failure"] !== undefined){
+      return "failed";
+    }
+    else if(testJson["skipped"] !== undefined){
+      return "skipped";
+    }
+    else{
+      return "passed";
+    }
+  }
+}

app/slack-message.ts

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+//@ts-check
+import { IncomingWebhook } from '@slack/webhook';
+import ActionInfo from './action-info';
+import ResultsParser from './results-parser';
+
+export default class SlackMessage {
+  testResults: ResultsParser;
+  constructor(testResults: ResultsParser) {
+    this.testResults = testResults;
+  }
+
+  async send(slackWebhookUrl: string, actionInfo: ActionInfo): Promise<void> {
+    const webhook = new IncomingWebhook(slackWebhookUrl);
+    const blocks = this.getBlocks(this.testResults, actionInfo);
+    await webhook.send({ text: `${actionInfo.workflowName} - ${this.testResults.failedTests > 0 ? "Failed": "Passed"}`, blocks: JSON.parse(blocks) });
+  }
+
+  private getFailedTestsSections(failed, failedTestsList: string[]): string {
+    const template = (testName: string, isFailed: boolean) =>  `{
+        "type": "section",
+        "text": {
+            "type": "mrkdwn",
+            "text": "${isFailed ? ":red_circle: " + testName : ":tada: *ALL PASSED*"} "
+        }
+    },`;
+    if (!failed) {
+        return template("", false);
+    }
+    else{
+        return failedTestsList.map(testName => template(testName, true)).join("\n");
+    }
+  }
+
+  private getOverralTestsSection(passedTests, skippedTests, failedTests): string {
+    const passedSubstring = passedTests > 0 ? `:large_green_circle: *PASSED: ${passedTests}*` : "";
+    const failedSubstring = failedTests > 0 ? `:red_circle: *FAILED: ${failedTests}*` : "";
+    const skippedSubstring = skippedTests > 0 ? `:white_circle: *SKIPPED: ${skippedTests}*` : "";
+    const template = (passedTests, skippedTests, failedTests) => `{
+        "type": "section",
+        "text": {
+            "type": "mrkdwn",
+            "text": "${passedSubstring} ${failedSubstring} ${skippedSubstring}"
+        }
+    },`;
+    return template(passedTests, skippedTests, failedTests);
+
+}
+
+  getBlocks(testResults: ResultsParser, actionInfo: ActionInfo): string {
+    const failedTests = testResults.failedTests;
+    const skippedTests = testResults.skippedTests;
+    const passedTests = testResults.passedTests;
+    const failedTestsList = testResults.failedTestsList;
+    const failed = failedTests > 0;
+    const failedTestsSections = this.getFailedTestsSections(failed, failedTestsList);
+    const overralTestsSection = this.getOverralTestsSection(passedTests, skippedTests, failedTests);
+  const nesta = `
+  [
+    {
+        "type": "context",
+        "elements": [
+            {
+                "type": "plain_text",
+                "text": "Action: ${actionInfo.workflowName}",
+                "emoji": true
+            }
+        ]
+    },
+    {
+        "type": "divider"
+    },
+    {
+        "type": "section",
+        "text": {
+            "type": "mrkdwn",
+            "text": ":clock1: *Execution time:* ${testResults.executionTime}"
+        }
+    },
+    ${overralTestsSection}
+    {
+        "type": "divider"
+    },
+    ${failedTestsSections}
+    {
+        "type": "divider"
+    },
+    {
+        "type": "actions",
+        "elements": [
+            {
+                "type": "button",
+                "text": {
+                    "type": "plain_text",
+                    "text": "Go to Action",
+                    "emoji": true
+                },
+                "value": "action_go",
+                "url": "${actionInfo.runUrl}"
+            }
+        ]
+    }
+]
+  `
+  return nesta;
+    }
+}