Python: the rb9704 command line, a fake modem, and the tests

rb9704 drives a 9704 on USB and the Cloudloop account behind it, moved
from WII6's host/rockblock with its project names taken out. rb9704-fake
speaks JSPR on a pty or a serial port: everything the library asks, MO in
segments with the CRC checked, MT, signal, provisioning, refusals and
failures on command.

The tests run against the fake at every level: the fake itself, the
command line, Ground Control's Python binding, the shell sample on
native_sim, and the sample on a board (test_zephyr.py, one suite through
two consoles). test_real.py makes free checks against a real modem.

python/tests/test_real.py

@@ -0,0 +1,49 @@
+"""
+A real RockBLOCK 9704, with --real-modem PORT. Free checks only: identity
+and signal, never a message, so nothing here costs airtime. Indoors the
+signal is usually 0, which passes.
+"""
+
+import re
+
+import pytest
+
+from conftest import NativeConsole
+
+
+@pytest.fixture
+def real(request):
+    port = request.config.getoption("--real-modem")
+    if not port:
+        pytest.skip("no --real-modem")
+    return port
+
+
+def test_library_identity(real):
+    rb = pytest.importorskip("rockblock9704")
+    m = rb.RockBlock9704()
+    assert m.begin(real)
+    try:
+        assert re.fullmatch(r"\d{15}", m.get_imei() or "")
+        assert m.get_card_present()
+        assert 0 <= m.get_signal() <= 5
+    finally:
+        m.end()
+
+
+def test_zephyr_native_sim_identity(real, request):
+    exe = request.config.getoption("--zephyr-exe")
+    if not exe:
+        pytest.skip("no --zephyr-exe")
+    c = NativeConsole(exe, real)
+    try:
+        c.sh("rb9704 begin")
+        c.out.expect(r"begin: ok", timeout=20)
+        c.sh("rb9704 info")
+        c.out.expect(r"imei\s+\d{15}", timeout=20)
+        c.sh("rb9704 signal")
+        c.out.expect(r"signal: [0-5] bars", timeout=20)
+        c.sh("rb9704 end")
+        c.out.expect(r"end: ok")
+    finally:
+        c.close()