小编mjc*_*der的帖子

RuntimeException每当我执行测试时，我都会收到：

package com.example.mytipcalculator

import androidx.test.espresso.Espresso.onView
import androidx.test.espresso.action.ViewActions
import androidx.test.espresso.action.ViewActions.click
import androidx.test.espresso.action.ViewActions.typeText
import androidx.test.espresso.assertion.ViewAssertions.matches
import androidx.test.espresso.matcher.ViewMatchers.withId
import androidx.test.espresso.matcher.ViewMatchers.withText
import androidx.test.ext.junit.rules.ActivityScenarioRule
import androidx.test.ext.junit.runners.AndroidJUnit4
import org.hamcrest.Matchers.containsString
import org.junit.Rule
import org.junit.runner.RunWith

@RunWith(AndroidJUnit4::class)
class CalculatorTests() {

    @get:Rule
    val activity = ActivityScenarioRule(MainActivity::class.java)

    fun test(){
        onView(withId(R.id.cost_of_service_edit_text))
        .perform(typeText("50.00"))
        .perform(ViewActions.closeSoftKeyboard())

        onView(withId(R.id.increase))
            .perform(click())

        onView(withId(R.id.increase))
            .perform(click())

        onView(withId(R.id.increase))
            .perform(click())

        onView(withId(R.id.increase))
            .perform(click())

        onView(withId(R.id.increase))
            .perform(click())

        onView(withId(R.id.calculate_button))
            .perform(click())

        onView(withId(R.id.tip_result))
            .check(matches(withText(containsString("$10.00"))))

        onView(withId(R.id.totalexpense))
            .check(matches(withText(containsString("$60.00"))))
    }
}

当我运行前面的代码时，出现以下初始化错误：

java.lang.RuntimeException: Failed to instantiate test runner class androidx.test.internal.runner.junit4.AndroidJUnit4ClassRunner
Test class class com.example.mytipcalculator.CalculatorTests is malformed. (1 problems):
java.lang.Exception: No runnable …