chore: de-prioritize "Mocha + Chai" option as it requires webpack 4 for now (#6401)

Author: haoqunjiang

packages/@vue/cli/lib/promptModules/__tests__/unit.spec.js

@@ -14,14 +14,14 @@ test('mocha', async () => {
     },
     {
       message: 'Pick a unit testing solution',
-      choices: ['Mocha', 'Jest'],
+      choices: ['Jest', 'Mocha'],
       choose: 0
     }
   ]
 
   const expectedOptions = {
     plugins: {
-      '@vue/cli-plugin-unit-mocha': {}
+      '@vue/cli-plugin-unit-jest': {}
     }
   }
 
@@ -42,14 +42,14 @@ test('jest', async () => {
     },
     {
       message: 'Pick a unit testing solution',
-      choices: ['Mocha', 'Jest'],
+      choices: ['Jest', 'Mocha'],
       choose: 1
     }
   ]
 
   const expectedOptions = {
     plugins: {
-      '@vue/cli-plugin-unit-jest': {}
+      '@vue/cli-plugin-unit-mocha': {}
     }
   }
 

packages/@vue/cli/lib/promptModules/unit.js

@@ -14,15 +14,15 @@ module.exports = cli => {
     type: 'list',
     message: 'Pick a unit testing solution:',
     choices: [
-      {
-        name: 'Mocha + Chai',
-        value: 'mocha',
-        short: 'Mocha'
-      },
       {
         name: 'Jest',
         value: 'jest',
         short: 'Jest'
+      },
+      {
+        name: 'Mocha + Chai (requires webpack 4)',
+        value: 'mocha',
+        short: 'Mocha'
       }
     ]
   })