tests: add basic Powered Up tests

These are a few generic tests that can be run on all Powered Up hubs.

tests/REAMDE.md

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+# Pybricks MicroPython tests
+
+Currently, the tests in the `ev3dev` folder are automated while the remaining
+folders contain tests that must be run manually.
+
+Use `./test-ev3dev.sh` in the top-level directory to run the automated tests
+(requires Linux).

tests/basic/count_forever.py

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+# Should be able to print forever in a tight loop.
+
+# Used to reproduce bug on https://github.com/pybricks/support/issues/163
+# and https://github.com/pybricks/support/issues/36
+
+# If it gets to at least 100000, things are looking good.
+
+
+def count():
+    n = 0
+    while True:
+        yield n
+        n += 1
+
+
+for n in count():
+    print("count:", n)

tests/basic/empty.py

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+# Should be able to handle an empty program.

tests/basic/hello_world.py

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+# Should be able to do a simple hello world.
+print("Hello world!")

tests/basic/system_exit.py

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+# Should be able to catch SystemExit from the stop button.
+
+from pybricks.tools import wait
+
+for i in range(3):
+    print("press stop button...")
+    try:
+        while True:
+            wait(10)
+    except SystemExit:
+        print("caught SystemExit", i)
+
+# Should print this after pressing the stop button 3 times.
+print("...done")

tests/pup/hub/status_light.py

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+# Should be able to display each color (note: colors without 100% saturation
+# will not appear correctly due to physics).
+
+# Press the stop button to advance to the next color
+
+from pybricks.hubs import *
+from pybricks.parameters import Color
+from pybricks.tools import wait
+
+# sneaky way to get XyzHub class without knowning which hub
+hub = next(v for k, v in globals().items() if k.endswith("Hub"))()
+
+for c in Color:
+    print("Color:", c)
+    hub.light.on(Color[c])
+    try:
+        while True:
+            wait(10)
+    except SystemExit:
+        continue
+
+hub.light.off()
+print("...done")

tests/pup/hub/status_light_animatinon.py

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+# Should be able to smoothly transition between all colors.
+
+from pybricks.hubs import *
+from pybricks.parameters import Color
+from pybricks.tools import wait
+
+# sneaky way to get XyzHub class without knowning which hub
+hub = next(v for k, v in globals().items() if k.endswith("Hub"))()
+
+# Every possible hue with 100% saturation, 100% brightness.
+# Note: In real programs, use every 2 or 3 degrees to save memory.
+rainbow = [Color.BLUE >> d for d in range(360)]
+
+hub.light.animate(rainbow, 100)
+
+while True:
+    wait(10)