Excution failed for task ‘:app:preDebugAndroidTestBuild'解决方案

        报错信息大体如下：

Error:FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:preDebugAndroidTestBuild'.
> Conflict with dependency 'com.google.code.gson:gson' in project ':app'. Resolved versions for app (2.7) and test app (2.8.0) differ. See https://d.android.com/r/tools/test-apk-dependency-conflicts.html for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 3s

        报错信息显示项目中有两个不通版本的gson依赖（2.7与2.8.0），分析应该是项目引用的第三方sdk中有相关引用，但未找到具体位置，于是采用暴力方式解决，在主工程的build.gradle中android{}添加如下代码：

    configurations.all {
        resolutionStrategy.force 'com.google.code.gson:gson:2.7'
    }

        解决，类似依赖包的问题，短时间内无法找到解决根源，可尝试采用此种暴力方式暂时解决。