＆＃39; transformClassesWithMultidexlistForDebugAndroidTest＆＃39; android.support.test.runner.AndroidJUnitRunner指定

Question

我试图在MultiDex应用程序上运行espresso测试并且因以下错误而失败

  

错误：任务执行失败＆gt; ：transformClassesWithMultidexlistForDebugAndroidTest＆＃39 ;.   java.io.IOException：输出jar为空。你有没有指定正确的＆gt; ＆＃39; -keep＆＃39;选项？

这是我的build.gradle中的相关部分

defaultConfig {
        ...
        //      Enabling multidex support.
        multiDexEnabled true
        dexOptions {
            jumboMode true
        }

        testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner'
    }

我确实有一个解决方法：

1. 评论＆＃39; testInstrumentationRunner＆＃39;线
2. 构建测试
3. 取消注释该行
4. 运行测试

这似乎有效，但我需要在我更改测试代码时重新执行此操作，这是一个很大的痛苦。

可以在网上罚款类似的错误，但对我的情况没有任何特别的解释......

我正在使用Android studio构建

Answer 1

My reputation doesn't allow me to comment, so will write as an answer:

Exactly the same workaround works for me:

1. Commenting the string with 'testInstumentationRunner'
2. Building tests. There will be an exception that Instrumentation Runner is not found
3. Uncomment the string
4. Run the test

UPD: This solution worked for me, though the question there is about different problem:

Android Espresso not working with Multidex gives "No tests found"