Robolectric 4 support

As I have read, tests written with androidx.test.* are supposed to be executed either as an instrumented test (in a real device or emulator) or in the JVM with robolectric 4. So I have copied the ChangeTextBehaviorKtTest in the test folder, and I have added robolectric 4 dependency to gradle file. Also I have copied the rest of androidx.test.* dependencies with testImplementation keyword. Everything seems ok, until I try to execute the tests.

This is what I get:

[Robolectric] com.example.android.testing.espresso.BasicSample.ChangeTextBehaviorKtTest2.changeText_sameActivity: sdk=28; resources=binary
Called loadFromPath(/system/framework/framework-res.apk, true); mode=binary sdk=28

androidx.test.espresso.PerformException: Error performing 'close keyboard' on view 'with id: com.example.android.testing.espresso.BasicSample:id/editTextUserInput'.

Caused by: java.lang.RuntimeException: Attempt to close the soft keyboard did not result in soft keyboard to be hidden. resultCode = -1

So I have removed the call to closeSoftKeyboard() function, as I have noticed that is not necessary with instrumented tests so that they can be executed successfully.

When I remove the call to that funcion, the first test changeText_sameActivity is executed successfully, but the second still fails, with this new exception:

[Robolectric] com.example.android.testing.espresso.BasicSample.ChangeTextBehaviorKtTest2.changeText_newActivity: sdk=28; resources=binary
Called loadFromPath(/system/framework/framework-res.apk, true); mode=binary sdk=28

androidx.test.espresso.NoMatchingViewException: No views in hierarchy found matching: with id: com.example.android.testing.espresso.BasicSample:id/show_text_view

View Hierarchy:
+>DecorView{id=-1, visibility=VISIBLE, width=320, height=470, has-focus=true, has-focusable=true, has-window-focus=true, is-clickable=false, is-enabled=true, is-focused=false, is-focusable=false, is-layout-requested=false, is-selected=false, layout-params={(0,0)(fillxfill) ty=APPLICATION wanim=0x10302f8
fl=LAYOUT_IN_SCREEN LAYOUT_INSET_DECOR SPLIT_TOUCH HARDWARE_ACCELERATED DRAWS_SYSTEM_BAR_BACKGROUNDS
pfl=FORCE_DRAW_STATUS_BAR_BACKGROUND}, tag=null, root-is-layout-requested=false, has-input-connection=false, x=0.0, y=0.0, child-count=1}

Bắt đầu với ChangeTextBehaviorKtTest đã sao chép và các phần phụ thuộc kiểm thử Gradle được mô tả trong issue, sau đó chạy cả changeText_sameActivity và changeText_newActivity trên Robolectric 4. So sánh lỗi bàn phím và hệ phân cấp show_text_view bị thiếu với hành vi instrumented; hoàn thành có nghĩa là cả hai kiểm thử đều thực thi thành công mà không xóa hành động bàn phím.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.