fix: modify jest config to look for absence of .env.test file

jest.config.js

@@ -2,7 +2,7 @@ const { createConfig } = require('@edx/frontend-build');
 const path = require('path');
 const fs = require('fs');
 
-const appEnvConfigPath = path.resolve(process.cwd(), './env.config.js');
+const testEnvConfigPath = path.resolve(process.cwd(), './.env.test');
 
 module.exports = createConfig('jest', {
   setupFilesAfterEnv: [
@@ -27,12 +27,13 @@ module.exports = createConfig('jest', {
 /*
 Add environment variables here for testing with Jest Snapshot
 
+Context: This is part of the gradual transformation from using .env.* to env.config.js
+Snapshot is not aware of the JavaScript-based configuration, and without .env.test it
+needs this logic to populate the process.env object.
+
 TODO: Remove once all uses of process.env.[ENVIRONMENT_VARIABLE] are replaced in /src
-This is part of the gradual transformation from using .env.* to env.config.js
-Jest's Snapshot is not aware of the JavaScript-based configuration, and without
-.env.test it needs this logic to populate the process.env object.
 */
-if (fs.existsSync(appEnvConfigPath)) {
+if (!fs.existsSync(testEnvConfigPath)) {
   process.env = Object.assign(process.env, {
     LMS_BASE_URL: 'http://localhost:18000',
     LOGOUT_URL: 'http://localhost:18000/logout',