tests: tests for a few simple hidpp20 functions

tests/test_hidpp20_simple.py

@@ -0,0 +1,48 @@
+from collections import namedtuple
+
+import logitech_receiver.hidpp20 as hidpp20
+
+response = namedtuple('response', 'response device feature function params')
+
+
+def feature_request(device, feature, function=0x00, *params, no_reply=False):
+    global responses
+    assert len(responses) > 0, f"extra call of feature_request {device}, {feature}, {function}, {params}, {no_reply}"
+    r = responses[0]
+    if r.device == device and r.feature == feature and r.function == function and r.params == params:
+        responses = responses[1:]
+        return bytes.fromhex(r.response) if r.response is not None else None
+    raise AssertionError(f"incorrect call of feature_request {device}, {feature}, {function}, {params}, {no_reply}")
+
+
+def test_set_host_name(mocker):  # FIXME
+    global responses
+    mocker.patch('logitech_receiver.hidpp20.feature_request', wraps=feature_request)
+    responses = [response('03FFFFFFFF', None, hidpp20.FEATURE.HOSTS_INFO, 0x00, ())]  # FIXME
+    hidpp20.set_host_name(None, 'THIS IS A LONG HOST NAME')
+    assert responses == []
+
+
+def test_get_polling_rate(mocker):
+    global responses
+    mocker.patch('logitech_receiver.hidpp20.feature_request', wraps=feature_request)
+    responses = [response('03FFFF', None, hidpp20.FEATURE.REPORT_RATE, 0x10, ())]
+    result = hidpp20.get_polling_rate(None)
+    assert result == '3ms'
+    assert responses == []
+    responses = [
+        response(None, None, hidpp20.FEATURE.REPORT_RATE, 0x10, ()),
+        response('04FFFF', None, hidpp20.FEATURE.EXTENDED_ADJUSTABLE_REPORT_RATE, 0x20, ())
+    ]
+    result = hidpp20.get_polling_rate(None)
+    assert result == '500us'
+    assert responses == []
+
+
+def test_get_remaining_pairing(mocker):
+    global responses
+    mocker.patch('logitech_receiver.hidpp20.feature_request', wraps=feature_request)
+    responses = [response('03FFFF', None, hidpp20.FEATURE.REMAINING_PAIRING, 0x0, ())]
+    result = hidpp20.get_remaining_pairing(None)
+    assert result == 0x03
+    assert responses == []