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_cli.py

@@ -0,0 +1,46 @@
+"""The rb9704 command line against the fake modem."""
+
+import subprocess
+import sys
+
+import pytest
+
+
+def run(*args, timeout=30):
+    return subprocess.run([sys.executable, "-m", "rb9704tools.cli", *args], capture_output=True,
+                          text=True, timeout=timeout)
+
+
+def test_jspr_raw(fake):
+    r = run("-p", fake.port, "jspr", "--setup", "GET hwInfo {}")
+    assert r.returncode == 0, r.stderr
+    assert "300434030000000" in r.stdout
+
+
+def test_provision_sees_topics(fake):
+    r = run("-p", fake.port, "provision", "--timeout", "10")
+    assert r.returncode == 0, r.stdout + r.stderr
+    assert "244" in r.stdout
+
+
+def test_info_through_the_library(fake):
+    pytest.importorskip("rockblock9704")
+    r = run("-p", fake.port, "info")
+    assert r.returncode == 0, r.stderr
+    assert "300434030000000" in r.stdout
+
+
+def test_send_asks_first(fake):
+    pytest.importorskip("rockblock9704")
+    r = subprocess.run([sys.executable, "-m", "rb9704tools.cli", "-p", fake.port, "send",
+                        "--text", "x"], input="n\n", capture_output=True, text=True, timeout=30)
+    assert "airtime" in (r.stdout + r.stderr).lower()
+    assert not any(l.startswith("MO ") for l in fake.out.seen)
+
+
+def test_send_with_yes(fake):
+    pytest.importorskip("rockblock9704")
+    r = run("-p", fake.port, "send", "--text", "cli-hello", "--yes")
+    assert r.returncode == 0, r.stdout + r.stderr
+    m = fake.out.expect(r"^MO 244 \d+ (\w+)")
+    assert bytes.fromhex(m.group(1)) == b"cli-hello"