操作系统为Windows 10(64位),使用Android Studio 3.1.2,Gradle版本为4.4,Java版本为1.8。
以下是我的布局XML代码:
<TextView
android:id="@+id/loginTextView"
android:layout_width="255dp"
android:layout_height="60dp"
android:layout_marginBottom="15dp"
android:background="@drawable/sign_in_login_bg"
android:gravity="center"
app:layout_constraintBottom_toTopOf="@+id/registerTextView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
Here @drawable/sign_in_login_bg
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="@color/color_primary" />
<corners android:radius="@dimen/text_view_rounded_corner_radius" />
</shape>
我希望编写一个espresso测试,检查loginTextView是否具有背景@drawable/sign_in_login_bg
因此,我编写了自定义匹配器:
import org.hamcrest.Matcher;
public static Matcher<View> withBackground(final int expectedResourceId) {
return new BoundedMatcher<View, View>(View.class) {
@Override
public boolean matchesSafely(View view) {
return sameBitmap(view.getContext(), view.getBackground(), expectedResourceId);
}
@Override
public void describeTo(Description description) {
description.appendText("has background resource " + expectedResourceId);
}
};
}
这里是方法sameBitmap:
private static boolean sameBitmap(Context context, Drawable drawable, int expectedId) {
Drawable expectedDrawable = ContextCompat.getDrawable(context, expectedId);
if (drawable == null || expectedDrawable == null) {
return false;
}
if (drawable instanceof StateListDrawable && expectedDrawable instanceof StateListDrawable) {
drawable = drawable.getCurrent();
expectedDrawable = expectedDrawable.getCurrent();
}
if (drawable instanceof BitmapDrawable) {
Bitmap bitmap = ((BitmapDrawable) drawable).getBitmap();
Bitmap otherBitmap = ((BitmapDrawable) expectedDrawable).getBitmap();
return bitmap.sameAs(otherBitmap);
}
return false;
}
以下是我的浓缩咖啡测试结果:
@Test
public void loginTextViewBackground() {
onView(withId(R.id.loginTextView)).check(matches(withBackground(R.drawable.sign_in_login_bg)));
}
但是我遇到了错误:
android.support.test.espresso.base.DefaultFailureHandler$AssertionFailedWithCauseError: 'has background resource 2131230909' doesn't match the selected view.
Expected: has background resource 2131230909
Got: "AppCompatTextView{id=2131296429, res-name=loginTextView, visibility=VISIBLE, width=765, height=180, has-focus=false, has-focusable=false, has-window-focus=true, is-clickable=true, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, layout-params=android.support.constraint.ConstraintLayout$LayoutParams@bcce82, tag=null, root-is-layout-requested=false, has-input-connection=false, x=158.0, y=1283.0, text=Login, input-type=0, ime-target=false, has-links=false}"
at dalvik.system.VMStack.getThreadStackTrace(Native Method)
at java.lang.Thread.getStackTrace(Thread.java:580)
at android.support.test.espresso.base.DefaultFailureHandler.getUserFriendlyError(DefaultFailureHandler.java:90)
at android.support.test.espresso.base.DefaultFailureHandler.handle(DefaultFailureHandler.java:52)
at android.support.test.espresso.ViewInteraction.waitForAndHandleInteractionResults(ViewInteraction.java:314)
at android.support.test.espresso.ViewInteraction.check(ViewInteraction.java:291)
at com.myproject.android.activity.SignInActivityTest.loginTextViewBackground(SignInActivityTest.java:158)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1879)
Caused by: junit.framework.AssertionFailedError: 'has background resource 2131230909' doesn't match the selected view.
Expected: has background resource 2131230909
Got: "AppCompatTextView{id=2131296429, res-name=loginTextView, visibility=VISIBLE, width=765, height=180, has-focus=false, has-focusable=false, has-window-focus=true, is-clickable=true, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, layout-params=android.support.constraint.ConstraintLayout$LayoutParams@bcce82, tag=null, root-is-layout-requested=false, has-input-connection=false, x=158.0, y=1283.0, text=Login, input-type=0, ime-target=false, has-links=false}"
at android.support.test.espresso.matcher.ViewMatchers.assertThat(ViewMatchers.java:526)