public class StringUtilsTests extends TestCase {

    String message;
    @Override
    protected void setUp() throws Exception {
        super.setUp();
        message = "33,333";
    }

    /**
     *
     */
    public void testCommaToSpaces() {
        String result = StringUtils.commasToSpaces(message);
        assertEquals("33 333", result);
    }
}

建筑等级：-

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:23.0.0'
    compile 'com.google.android.gms:play-services-plus:7.5.0'
    compile 'com.google.android.gms:play-services-ads:7.5.0'
    compile 'com.google.android.gms:play-services-maps:7.5.0'
    compile 'com.google.android.gms:play-services-gcm:7.5.0'
    compile 'com.google.android.gms:play-services-location:7.5.0'
    compile 'com.squareup.retrofit:retrofit:1.9.0'
    compile 'com.google.code.gson:gson:2.3.1'

    // Unit testing dependencies
    testCompile 'junit:junit:4.12'
    // Set this dependency if you want to use Mockito
    testCompile 'org.mockito:mockito-core:1.10.19'
}

testOptions {
    unitTests.all {
        // All the usual Gradle options.
        jvmArgs '-XX:MaxPermSize=256m'
    }
}

sourceSets {
    unitTest {
        java.srcDir file('src/androidTest/java')
    }
}

configurations {
    unitTestCompile.extendsFrom runtime
    unitTestRuntime.extendsFrom unitTestCompile
}

dependencies {
    unitTestCompile files("$project.buildDir/results-tests")
}

task unitTest(type: Test, dependsOn: assemble) {
    description = "run unit tests"
    testClassesDir = project.sourceSets.unitTest.output.classesDir
    classpath = project.sourceSets.unitTest.runtimeClasspath
}

check.dependsOn unitTest

我尝试了很多东西后，谷歌搜索了一天多，但测试报告- xml/html没有得到生成。请善意的指导，如果有人有任何想法。

如果我在行下方添加，则gradle同步失败。

reports.html.enabled = true