(Test cross-imports) Don't cross-import test utils

Some test files import test utilities from other library's tests. This won't be possible once Material and Cupertino are moved to the flutter/packages repo.

For example:

https://github.com/flutter/flutter/blob/935b8f70305b2d82d76b2a15d568d973e2835895/packages/flutter/test/material/scaffold_test.dart#L15

Umbrella issue: https://github.com/flutter/flutter/issues/177028

### What to do about it
 * Move the util to flutter_test if:
   - it's used in many places.
   - it has a solid API that has been in use for awhile and we are ready to commit to it.
   - it's of public-level quality.
 * Duplicate the util if:
   - its implementation is trivial, or it's just a constant, etc.
   - we are worried about its API needing changes and don't want to make it public.
 * Any other options? I don't think it will be possible to import it any other way.

### The utils

Rendering:
 * [TestCallbackPainter](https://github.com/flutter/flutter/blob/0ef66c7d1a4c3ed303fdd2aa0349d39955b0e0ef/packages/flutter/test/rendering/rendering_tester.dart#L286)

Widgets:
 * [TestSemantics](https://github.com/flutter/flutter/blob/0ef66c7d1a4c3ed303fdd2aa0349d39955b0e0ef/packages/flutter/test/widgets/semantics_tester.dart#L22)
   - A very common one.
 * [TestListTile](https://github.com/flutter/flutter/blob/master/packages/flutter/test/widgets/list_tile_test_utils.dart)
 * [editable_text_utils](https://github.com/flutter/flutter/blob/master/packages/flutter/test/widgets/editable_text_utils.dart)
    - May contain several members that need to move. https://github.com/flutter/flutter/pull/182632 is moving TestTextField out of this file right now. I see lots of uses of textOffsetToPosition too.
   - textOffsetToPosition
 * [MockClipboard](https://github.com/flutter/flutter/blob/master/packages/flutter/test/widgets/clipboard_utils.dart)
 * [live_text_utils.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/widgets/live_text_utils.dart)
 * [text_selection_toolbar_utils.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/widgets/text_selection_toolbar_utils.dart)
 * [simullateSystemBack](https://github.com/flutter/flutter/blob/master/examples/api/test/widgets/navigator_utils.dart)
 * [FeedbackTester](https://github.com/flutter/flutter/blob/master/packages/flutter/test/widgets/feedback_tester.dart)
 * [MockProcessTextHandler](https://github.com/flutter/flutter/blob/master/packages/flutter/test/widgets/process_text_utils.dart)
 * [verifySliverGeometry](https://github.com/flutter/flutter/blob/master/packages/flutter/test/widgets/sliver_test_utils.dart)
 * [FakeView](https://github.com/flutter/flutter/blob/master/packages/flutter_test/test/multi_view_testing.dart)
 * [TestBorder](https://github.com/flutter/flutter/blob/master/packages/flutter/test/widgets/test_border.dart)

### Tests to fix:

#### Material importing Widgets
```
$ rg "import '\.\.\/widgets" packages/flutter/test/material -l
```

 * [material/segmented_button_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/segmented_button_test.dart)
    * PR: https://github.com/flutter/flutter/pull/185250
 * [material/bottom_navigation_bar_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/bottom_navigation_bar_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
    * PR: https://github.com/flutter/packages/pull/12005
 * [material/tabs_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/tabs_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
 * [material/ink_well_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/ink_well_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
 * [material/list_tile_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/list_tile_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
 * [material/icon_button_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/icon_button_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
 * [material/user_accounts_drawer_header_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/user_accounts_drawer_header_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184809
 * [material/scaffold_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/scaffold_test.dart)
    * PR: https://github.com/flutter/flutter/pull/183790
    * PR: https://github.com/flutter/packages/pull/11973
 * [material/dropdown_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/dropdown_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
 * [material/selectable_text_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/selectable_text_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184278
 * [material/range_slider_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/range_slider_test.dart)
    * PR: https://github.com/flutter/packages/pull/11983
 * [material/floating_action_button_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/floating_action_button_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
 * [material/text_button_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/text_button_test.dart)
    * PR: https://github.com/flutter/flutter/pull/186667
 * [material/navigation_rail_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/navigation_rail_test.dart)
    * PR: https://github.com/flutter/packages/pull/11974
 * [material/date_picker_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/date_picker_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184278
 * [material/outlined_button_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/outlined_button_test.dart)
    * PR: https://github.com/flutter/flutter/pull/186667
 * [material/selection_area_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/selection_area_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184295
 * [material/filter_chip_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/filter_chip_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
 * [material/drawer_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/drawer_test.dart)
    * PR: https://github.com/flutter/packages/pull/11976
 * [material/checkbox_list_tile_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/checkbox_list_tile_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
 * [material/slider_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/slider_test.dart)
    * PR: https://github.com/flutter/packages/pull/11977
 * [material/menu_anchor_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/menu_anchor_test.dart)
    * PR: https://github.com/flutter/packages/pull/11995
 * [material/radio_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/radio_test.dart)
    * PR: https://github.com/flutter/packages/pull/11983
 * [material/toggle_buttons_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/toggle_buttons_test.dart)
    * PR: https://github.com/flutter/packages/pull/11983
 * [material/autocomplete_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/autocomplete_test.dart)
    * PR: https://github.com/flutter/packages/pull/12000
 * [material/search_anchor_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/search_anchor_test.dart)
    * PR: https://github.com/flutter/packages/pull/11997
 * [material/app_bar_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/app_bar_test.dart)
    * PR: https://github.com/flutter/packages/pull/11998
 * [material/text_selection_toolbar_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/text_selection_toolbar_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184519
 * [material/radio_list_tile_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/radio_list_tile_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
 * [material/search_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/search_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184278
 * [material/animated_icons_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/animated_icons_test.dart)
    * PR: https://github.com/flutter/packages/pull/12000
 * [material/text_selection_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/text_selection_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184278
    * PR: https://github.com/flutter/flutter/pull/184519
 * [material/adaptive_text_selection_toolbar_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/adaptive_text_selection_toolbar_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184278
    * PR: https://github.com/flutter/flutter/pull/184517
 * [material/text_field_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/text_field_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184278
    * PR: https://github.com/flutter/flutter/pull/184279
    * PR: https://github.com/flutter/flutter/pull/184295
    * PR: https://github.com/flutter/flutter/pull/184517
    * PR: https://github.com/flutter/flutter/pull/184519
 * [material/checkbox_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/checkbox_test.dart)
    * PR: https://github.com/flutter/packages/pull/11983
 * [material/bottom_sheet_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/bottom_sheet_test.dart)
    * PR: https://github.com/flutter/packages/pull/12001
 * [material/calendar_date_picker_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/calendar_date_picker_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
 * [material/switch_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/switch_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184295
 * [material/text_form_field_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/text_form_field_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184278
    * PR: https://github.com/flutter/flutter/pull/184519
 * [material/dialog_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/dialog_test.dart)
    * PR: https://github.com/flutter/packages/pull/12002
 * [material/popup_menu_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/popup_menu_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
 * [material/raw_material_button_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/raw_material_button_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184806
 * [material/date_range_picker_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/date_range_picker_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
 * [material/sliver_app_bar_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/sliver_app_bar_test.dart)
    * PR: https://github.com/flutter/packages/pull/12002
 * [material/dropdown_menu_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/dropdown_menu_test.dart)
    * PR: https://github.com/flutter/packages/pull/12002
 * [material/card_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/card_test.dart)
    * PR: https://github.com/flutter/flutter/pull/185736
 * [material/flexible_space_bar_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/flexible_space_bar_test.dart)
    * PR: https://github.com/flutter/packages/pull/12004
 * [material/chip_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/chip_test.dart)
    * PR: https://github.com/flutter/packages/pull/12004
    * PR: also need to merge https://github.com/flutter/flutter/pull/184279
 * [material/elevated_button_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/elevated_button_test.dart)
    * PR: https://github.com/flutter/flutter/pull/186667
 * [material/switch_list_tile_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/switch_list_tile_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279
 * [material/tooltip_theme_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/tooltip_theme_test.dart)
    * PR: https://github.com/flutter/flutter/pull/188572
 * [material/input_date_picker_form_field_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/input_date_picker_form_field_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184278
 * [material/app_bar_sliver_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/app_bar_sliver_test.dart)
    * PR: https://github.com/flutter/packages/pull/12004
 * [material/material_button_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/material_button_test.dart)
    * PR: https://github.com/flutter/flutter/pull/186667
 * [material/data_table_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/data_table_test.dart)
    * PR: https://github.com/flutter/flutter/pull/185736
 * [material/filled_button_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/filled_button_test.dart)
    * PR: https://github.com/flutter/flutter/pull/186667
 * [material/material_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/material_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184295
 * [material/time_picker_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/material/time_picker_test.dart)
    * PR: https://github.com/flutter/flutter/pull/184279

#### Cupertino importing Widgets

```
$ rg "import '\.\.\/widgets" packages/flutter/test/cupertino -l
```

 * [cupertino/slider_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/slider_test.dart)
   * PR: https://github.com/flutter/flutter/pull/184805
 * [cupertino/tab_scaffold_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/tab_scaffold_test.dart)
   * PR: https://github.com/flutter/flutter/pull/184282
 * [cupertino/switch_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/switch_test.dart)
   * PR: https://github.com/flutter/flutter/pull/184295
 * [cupertino/sliding_segmented_control_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/sliding_segmented_control_test.dart)
   * PR: https://github.com/flutter/packages/pull/11979
 * [cupertino/nav_bar_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/nav_bar_test.dart)
   * PR: https://github.com/flutter/packages/pull/11980
 * [cupertino/radio_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/radio_test.dart)
   * PR: https://github.com/flutter/packages/pull/11981
 * [cupertino/action_sheet_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/action_sheet_test.dart)
   * PR: 
 * [cupertino/text_selection_toolbar_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/text_selection_toolbar_test.dart)
   * PR: https://github.com/flutter/flutter/pull/184519
 * [cupertino/segmented_control_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/segmented_control_test.dart)
   * PR: https://github.com/flutter/packages/pull/11982
 * [cupertino/text_form_field_row_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/text_form_field_row_test.dart)
   * PR: https://github.com/flutter/flutter/pull/184519
 * [cupertino/text_field_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/text_field_test.dart)
   * PR: https://github.com/flutter/flutter/pull/184278
   * PR: https://github.com/flutter/flutter/pull/184517
   * PR: https://github.com/flutter/flutter/pull/184519
 * [cupertino/sheet_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/sheet_test.dart)
   * PR: https://github.com/flutter/flutter/pull/184282
 * [cupertino/text_selection_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/text_selection_test.dart)
   * PR: https://github.com/flutter/flutter/pull/184278
   * PR: https://github.com/flutter/flutter/pull/184519
 * [cupertino/route_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/route_test.dart)
   * PR: https://github.com/flutter/packages/pull/11993
 * [cupertino/checkbox_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/checkbox_test.dart)
   * PR: https://github.com/flutter/flutter/pull/184279
 * [cupertino/button_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/button_test.dart)
   * PR: https://github.com/flutter/packages/pull/11992
 * [cupertino/picker_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/picker_test.dart)
   * PR: https://github.com/flutter/packages/pull/12008
 * [cupertino/adaptive_text_selection_toolbar_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/adaptive_text_selection_toolbar_test.dart)
   * PR: https://github.com/flutter/flutter/pull/184278
   * PR: https://github.com/flutter/flutter/pull/184517
   * PR: https://github.com/flutter/flutter/pull/184519
 * [cupertino/bottom_tab_bar_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/bottom_tab_bar_test.dart)
   * PR: https://github.com/flutter/packages/pull/12012
 * [cupertino/dialog_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/dialog_test.dart)
   * PR: 

#### Cupertino importing Rendering

```
$ rg "import '\.\.\/rendering" packages/flutter/test/cupertino -l
```

 * [cupertino/picker_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/picker_test.dart)
    * PR:
 * [cupertino/tab_scaffold_test.dart](https://github.com/flutter/flutter/blob/master/packages/flutter/test/cupertino/tab_scaffold_test.dart)
    * PR:


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Uh oh!

(Test cross-imports) Don't cross-import test utils #182636

What to do about it

The utils

Tests to fix:

Material importing Widgets

Cupertino importing Widgets

Cupertino importing Rendering

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Uh oh!

(Test cross-imports) Don't cross-import test utils #182636

Description

What to do about it

The utils

Tests to fix:

Material importing Widgets

Cupertino importing Widgets

Cupertino importing Rendering

Metadata

Metadata

Assignees

Labels

Type

Fields

Projects

Milestone

Relationships

Development

Issue actions