delete redundant test

__tests__/main.test.ts

@@ -1,15 +0,0 @@
-import * as process from 'process'
-import * as cp from 'child_process'
-import * as path from 'path'
-
-// shows how the runner will run a javascript action with env / stdout protocol
-test('test runs', () => {
-  process.env['GITHUB_SHA'] = '6e8dcce3fd71cfe9aca3e18c82255dd1e4052aa1'
-  process.env['INPUT_LENGTH'] = '6'
-  const ip = path.join(__dirname, '..', 'lib', 'main.js')
-  const options: cp.ExecSyncOptions = {
-    env: process.env
-  }
-  const output = cp.execSync(`node ${ip}`, options).toString()
-  expect(output).toContain('::set-output name=sha::6e8dcc')
-})