无法在Build Variant

Question

我在尝试创建一个新的buildType时会遇到问题，该类型将用于在“无连接”下对应用程序进行测试。状态，理想情况下，此构建将用于测试不同的错误消息以及应用程序在无法连接到服务器后端或其他服务时应处于的状态。

我有一个MainActivityTest.java并且android.support.test.espresso的所有导入都失败了，Android Studio表示它无法解析这些符号。

这是我的app模块的gradle：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.0"

    defaultConfig {
        applicationId "company.sampleapp"
        minSdkVersion 16
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            buildConfigField "String", "SERVER", "\"http://10.209.67.118:3000\""
            // Run code coverage reports by default on debug builds.
            testCoverageEnabled = true

            return true
        }
        noconnection {
            buildConfigField "String", "SERVER", "\"http://0.0.0.0\""
            debuggable true

            return true
        }
    }

    // Always show the result of every unit test, even if it passes.
    testOptions.unitTests.all {
        testLogging {
            events 'passed', 'skipped', 'failed', 'standardOut', 'standardError'
        }
    }

    return void
}

dependencies {
    // App's dependencies, including test
    compile "com.android.support:appcompat-v7:$rootProject.supportLibraryVersion"
    compile "com.android.support:cardview-v7:$rootProject.supportLibraryVersion"
    compile "com.android.support:design:$rootProject.supportLibraryVersion"
    compile "com.android.support:recyclerview-v7:$rootProject.supportLibraryVersion"
    compile "com.android.support:support-v4:$rootProject.supportLibraryVersion"
    compile "com.google.guava:guava:$rootProject.guavaVersion"
    compile "com.github.bumptech.glide:glide:$rootProject.glideVersion"
    compile "com.android.support.test.espresso:espresso-idling-resource:$rootProject.ext.espressoVersion"

    // Dependencies for local unit tests
    testCompile "junit:junit:$rootProject.ext.junitVersion"
    testCompile "org.mockito:mockito-all:$rootProject.ext.mockitoVersion"
    testCompile "org.hamcrest:hamcrest-all:$rootProject.ext.hamcrestVersion"
    testCompile "org.powermock:powermock-module-junit4:$rootProject.ext.powerMockito"
    testCompile "org.powermock:powermock-api-mockito:$rootProject.ext.powerMockito"

    // Android Testing Support Library's runner and rules
    androidTestCompile "com.android.support.test:runner:$rootProject.ext.runnerVersion"
    androidTestCompile "com.android.support.test:rules:$rootProject.ext.rulesVersion"

    // Espresso UI Testing dependencies.
    androidTestCompile "com.android.support.test.espresso:espresso-core:$rootProject.ext.espressoVersion"
    androidTestCompile "com.android.support.test.espresso:espresso-contrib:$rootProject.ext.espressoVersion"
    androidTestCompile "com.android.support.test.espresso:espresso-intents:$rootProject.ext.espressoVersion"
    compile fileTree(include: ['*.jar'], dir: 'libs')

    compile files('libs/javax.mail.jar')
    compile 'com.android.volley:volley:1.0.0'
    compile 'com.facebook.android:facebook-android-sdk:[4,5)'
    compile 'com.google.android.gms:play-services-maps:10.0.0'
    compile 'com.google.android.gms:play-services-location:10.0.0'
}

/*
Resolves dependency versions across test and production APKs, specifically, transitive
dependencies. This is required since Espresso internally has a dependency on support-annotations.
*/
configurations.all {
    resolutionStrategy.force "com.android.support:support-annotations:25.0.1"
}

/*
All direct/transitive dependencies shared between your test and production APKs need to be
excluded from the test APK! This is necessary because both APKs will contain the same classes. Not
excluding these dependencies from your test configuration will result in an dex pre-verifier error
at runtime. More info in this tools bug: (https://code.google.com/p/android/issues/detail?id=192497)
*/
configurations.compile.dependencies.each { compileDependency ->
    println "Excluding compile dependency: ${compileDependency.getName()}"
    configurations.androidTestCompile.dependencies.each { androidTestCompileDependency ->
        configurations.androidTestCompile.exclude module: "${compileDependency.getName()}"
    }
}

并开始在src/androidTest/java/company/sampleapp/MainActivityTest.java

中进行一些初步测试

目前除了一些样板之外什么都没有：

package company.sampleapp;

import android.support.test.espresso.Espresso;
import android.support.test.espresso.IdlingResource;
import android.support.test.filters.LargeTest;
import android.support.test.rule.ActivityTestRule;
import android.support.test.runner.AndroidJUnit4;

import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;

import static android.support.test.espresso.Espresso.onView;
import static android.support.test.espresso.action.ViewActions.click;
import static android.support.test.espresso.assertion.ViewAssertions.matches;
import static android.support.test.espresso.matcher.ViewMatchers.isDisplayed;
import static android.support.test.espresso.matcher.ViewMatchers.withId;
import static android.support.test.espresso.matcher.ViewMatchers.withText;

/**
 * Tests for main activity
 * trying out functional & visual testing with applitools eyes
 */
@RunWith(AndroidJUnit4.class)
@LargeTest
public class MainActivityTest {

    private IdlingResource testIdleRes;

    @Rule
    public ActivityTestRule<MainActivity> actRule = new ActivityTestRule<>(MainActivity.class);

    @Before
    public void before() throws Exception {
        testIdleRes = actRule.getActivity().getIdlingResource();
        Espresso.registerIdlingResources(testIdleRes);
    }

    @Test
    public void signIn_noConnection() {

    }

    @Test
    public void signIn_emptyFields() throws Exception {
        onView(withText(R.string.button_signin))
            .perform(click());

        onView(withId(R.id.errorSignin))
            .check(matches(isDisplayed()));
    }

    @After
    public void after() throws Exception {
        Espresso.unregisterIdlingResources(testIdleRes);
    }

}

在Android studio中，当我选择构建变体debug时，项目成功编译，当我切换到noconnection变体时，所有espresso导入都失败了。造成这种情况的原因是什么以及如何解决？

谢谢！