您应该在build.gradle（app）中添加以下内容：

testOptions {
        unitTests.returnDefaultValues = true
}

更多详情：http://tools.android.com/tech-docs/unit-testing-support#TOC-Method-...-not-mocked.-

我和你有一样的肺结核。@John Huang的回答帮了我。你首先需要模拟的位置，然后使用mockito时，把你想要的值。

@RunWith(PowerMockRunner::class)
class MapExtensionTest {
 @Mock
    private lateinit var location: Location

    //region calculateDistance
    @Test
    fun `given a valid store and a valid location  to calculateDistance should return the correct distance`() {
        Mockito.`when`(store.coordinate).thenReturn(coordinate)
        Mockito.`when`(coordinate.latitude).thenReturn(FAKE_LAT)
        Mockito.`when`(coordinate.longitude).thenReturn(FAKE_LON)
        Mockito.`when`(location.latitude).thenReturn(FAKE_LAT1)
        Mockito.`when`(location.longitude).thenReturn(FAKE_LON1)
        val result = FloatArray(1)
        Location.distanceBetween(
            store.coordinate.latitude,
            store.coordinate.longitude,
            location.latitude, location.longitude, result
        )

        store.calculateDistance(location)

        Assert.assertTrue(store.distance == result[0].toDouble())
    }

别忘了约翰说的

testOptions {
    unitTests.returnDefaultValues = true
}

如果你有带import的pb，这里是我的测试依赖项，但我不记得哪个对这个例子很重要，所以请记住，你可能不需要所有的

//testing dependencies
testImplementation "junit:junit:$junitVersion"
testImplementation "org.mockito:mockito-inline:${mockitoInlineVersion}"
testImplementation "androidx.arch.core:core-testing:${coreTestingVersion}"
testImplementation "com.nhaarman.mockitokotlin2:mockito-kotlin:${mockitoKotlinVersion}"
androidTestImplementation "org.mockito:mockito-android:${mockitoAndroidVersion}"
testImplementation group: 'org.powermock', name: 'powermock-api-mockito2', version: "${powerMockMockitoVersion}"
testImplementation group: 'org.powermock', name: 'powermock-module-junit4', version: "${powerMockjUnitVersion}"

使用Robolectric测试转轮为我解决了这个问题。

@RunWith(RobolectricTestRunner::class)
class TestClass {
   ...
}

注意：我不需要

testOptions {
        unitTests.returnDefaultValues = true
}

如果您的项目中还没有Robolectric依赖项，请不要忘记添加必要的Robolectric依赖项。