core: drop unused env variables (TREZOR_TEST, TREZOR_SAVE_SCREEN)

core/src/apps/debug/__init__.py

@@ -38,7 +38,7 @@ if __debug__:
     current_content = None  # type: Optional[List[str]]
 
     def screenshot() -> bool:
-        if utils.SAVE_SCREEN or save_screen:
+        if save_screen:
             ui.display.save(save_screen_directory + "/refresh-")
             return True
         return False

core/src/trezor/utils.py

@@ -20,13 +20,9 @@ if __debug__:
     if EMULATOR:
         import uos
 
-        TEST = int(uos.getenv("TREZOR_TEST") or "0")
         DISABLE_ANIMATION = int(uos.getenv("TREZOR_DISABLE_ANIMATION") or "0")
-        SAVE_SCREEN = int(uos.getenv("TREZOR_SAVE_SCREEN") or "0")
         LOG_MEMORY = int(uos.getenv("TREZOR_LOG_MEMORY") or "0")
     else:
-        TEST = 0
-        SAVE_SCREEN = 0
         LOG_MEMORY = 0
 
 if False:

docs/core/emulator/index.md

@@ -74,10 +74,6 @@ Press `p` on your keyboard to capture emulator's screen. You will find a png scr
 
 ### Environment Variables
 
-#### Auto print screen
-
-If ``` TREZOR_SAVE_SCREEN=1 ``` is set, the emulator makes print screen on every screen change.
-
 #### Memory statistics
 
 If ```TREZOR_LOG_MEMORY=1``` is set, the emulator prints memory usage information after each workflow task is finished.
@@ -85,7 +81,3 @@ If ```TREZOR_LOG_MEMORY=1``` is set, the emulator prints memory usage informatio
 #### Disable animations
 
 ```TREZOR_DISABLE_ANIMATION=1``` disables fading and other animations, which speeds up the UI workflows significantly (useful for tests). This is also requirement for UI integration tests.
-
-#### Tests
-
-```TREZOR_TEST``` informs whether device tests are to be run. Currently unused.