多次运行浓缩咖啡测试 [英] Run espresso test multiple times

问题描述

有时我在应用程序中遇到罕见的错误。但我不能复制它，因为它非常罕见。因此，我决定编写简单的浓缩咖啡测试：

@RunWith(AndroidJUnit4::class)
@LargeTest
class MainActivityTest {

    val password = "1234"

    @Rule @JvmField
    var mActivityRule: ActivityTestRule<MainActivity> = ActivityTestRule(MainActivity::class.java)

    @Test
    fun checkNotesListNotEmpty() {
        onView(withId(R.id.password_edit_text)).perform(typeText(password))
        onView(withId(R.id.notes_recycler_view)).check { view, noMatchingViewException ->
            if (noMatchingViewException != null) throw noMatchingViewException
            assertThat((view as RecyclerView).adapter.itemCount,  Matchers.`is`(1))
        }
    }
}

如何循环此测试并在匹配失败时停止它？

推荐答案

使用@Repeat批注：

@RunWith(AndroidJUnit4.class)
public class MyTest {

    @Rule
    public RepeatRule repeatRule = new RepeatRule();

    @Test
    @Repeat(100)
    fun checkNotesListNotEmpty() {
    }

但您必须亲自实施：

Repeat.java：

import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
import static java.lang.annotation.ElementType.METHOD;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention( RetentionPolicy.RUNTIME )
@Target({ METHOD, ANNOTATION_TYPE })
public @interface Repeat {
    int value() default 1;
}

RepeatRule.java：

import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;

public class RepeatRule implements TestRule {

    private static class RepeatStatement extends Statement {
        private final Statement statement;
        private final int repeat;    

        public RepeatStatement(Statement statement, int repeat) {
            this.statement = statement;
            this.repeat = repeat;
        }

        @Override
        public void evaluate() throws Throwable {
            for (int i = 0; i < repeat; i++) {
                statement.evaluate();
            }
        }

    }

    @Override
    public Statement apply(Statement statement, Description description) {
        Statement result = statement;
        Repeat repeat = description.getAnnotation(Repeat.class);
        if (repeat != null) {
            int times = repeat.value();
            result = new RepeatStatement(statement, times);
        }
        return result;
    }
}

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