[PATCH BlueZ v2 4/4] test: functional: add bearer ReadRSSI test

[Kevin Dewald <kevin@simpleble.org>]

Read the RSSI of the LE connection from a host with testing interfaces
enabled, check ReadRSSI fails with NotConnected once disconnected, and
check a host without testing interfaces does not expose it.

Assisted-by: Claude:claude-opus-5.5
---
 test/functional/test_bearer.py | 42 ++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/test/functional/test_bearer.py b/test/functional/test_bearer.py
index 59ce8ef7d..41134221a 100644
--- a/test/functional/test_bearer.py
+++ b/test/functional/test_bearer.py
@@ -54,6 +54,9 @@ UPDATE_CONF = LE_CONF + "[LE]\nMinConnectionInterval = 80\nMaxConnectionInterval
 
 CONN_PARAMS = ("Interval", "Latency", "SupervisionTimeout", "Subrate")
 
+# ReadRSSI is a testing method
+TESTING_CONF = LE_CONF + "Testing = true\n"
+
 
 class Bearers(HostPlugin, EventPluginMixin):
     """
@@ -283,6 +286,45 @@ def test_bearer_le_conn_params(hosts):
             assert host.bearers.get(remote.bdaddr, LE_INTERFACE, name) is None
 
 
+@host_config(
+    [
+        Bluetoothd(conf=TESTING_CONF, args=ARGS),
+        Agent(capability="NoInputNoOutput"),
+        Bearers(),
+    ],
+    [
+        Bluetoothd(conf=LE_CONF, args=ARGS),
+        LeAdvertiser(),
+        Agent(capability="NoInputNoOutput"),
+        Bearers(),
+    ],
+)
+def test_bearer_le_read_rssi(hosts):
+    host0, host1 = hosts
+
+    connect_le(host0, host1)
+
+    for host, remote in peers(host0, host1):
+        wait_until(
+            lambda: host.bearers.get(remote.bdaddr, LE_INTERFACE, "Connected") is True
+        )
+
+    # The emulated controller reports -1 dBm for every connection
+    host0.bearers.call(host1.bdaddr, LE_INTERFACE, "ReadRSSI")
+    reply = host0.bearers.expect(f"{LE_INTERFACE}.ReadRSSI:reply")
+    assert reply.values == (-1,)
+
+    host1.bearers.call(host0.bdaddr, LE_INTERFACE, "ReadRSSI")
+    error = host1.bearers.expect(f"{LE_INTERFACE}.ReadRSSI:error").error
+    assert error.get_dbus_name() == "org.freedesktop.DBus.Error.UnknownMethod"
+
+    disconnect(host0, host1, LE_INTERFACE)
+
+    host0.bearers.call(host1.bdaddr, LE_INTERFACE, "ReadRSSI")
+    error = host0.bearers.expect(f"{LE_INTERFACE}.ReadRSSI:error").error
+    assert error.get_dbus_name() == "org.bluez.Error.NotConnected"
+
+
 @host_config(
     [
         Bluetoothd(conf=LE_CONF, args=ARGS),
-- 
2.54.0 (Apple Git-157)