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tests/import/builtin_ext.py: Add test for built-in module override.
This verifies the behavior: - Exact matches of built-ins bypass filesystem. - u-prefix modules can be overridden from the filesystem. - Builtin import can be forced using either u-prefix or sys.path=[]. This work was funded through GitHub Sponsors. Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
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‎tests/import/builtin_ext.py‎

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import sys
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print(sys, hasattr(sys, "__file__"))
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sys.path.clear()
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sys.path.append("ext")
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# All three should only get builtins, despite sys.py, usys.py, and
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# micropython.py being in the path.
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import micropython
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print(micropython, hasattr(micropython, "__file__"))
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import sys
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print(sys, hasattr(sys, "__file__"))
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import usys
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print(usys, hasattr(usys, "__file__"))
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# This should get os.py, which uses uos to get the builtin.
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import os
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print(os, hasattr(os, "__file__"), os.sep, os.extra)
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# This should get time.py, which uses empty sys.path to get the builtin.
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import time
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print(time, hasattr(time, "__file__"), time.sleep, time.extra)
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# These should get the builtins.
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import uos
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print(uos, hasattr(uos, "__file__"), hasattr(uos, "extra"))
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import utime
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print(utime, hasattr(utime, "__file__"), hasattr(utime, "extra"))

‎tests/import/builtin_ext.py.exp‎

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<module 'sys'> False
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<module 'micropython'> False
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<module 'sys'> False
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<module 'sys'> False
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os from filesystem
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<module 'os' from 'ext/os.py'> True / 1
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time from filesystem
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<module 'time' from 'ext/time.py'> True <function> 1
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<module 'uos'> False False
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<module 'utime'> False False

‎tests/import/ext/micropython.py‎

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# micropython is always builtin and cannot be overriden by the filesystem.
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print("ERROR: micropython from filesystem")

‎tests/import/ext/os.py‎

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print("os from filesystem")
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from uos import *
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extra = 1

‎tests/import/ext/sys.py‎

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# sys is always builtin and cannot be overriden by the filesystem.
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print("ERROR: sys from filesystem")

‎tests/import/ext/time.py‎

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print("time from filesystem")
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# Tests the CPython-compatible / non-u-prefix way of forcing a builtin
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# import.
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import sys
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_path = sys.path[:]
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sys.path.clear()
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from time import *
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sys.path.extend(_path)
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del _path
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extra = 1

‎tests/import/ext/usys.py‎

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# usys (and any u-prefix) is always builtin and cannot be overriden by the
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# filesystem.
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print("ERROR: usys from filesystem")

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