🚧 WIP

tests/test_webui.py

@@ -499,6 +499,57 @@ class TestChannelRanges:
             "channel_ranges": {"AI4.0": {"min": 0}}, **base})
         assert r.status_code == 400            # missing max
 
+    async def test_negative_range_accepted(self, client, app):
+        r = await client.put("/api/config/channel-ranges", json={
+            "channel_ranges": {"AI4.0": {"min": -32000, "max": 32000}},
+            "persist": False,
+        })
+        assert r.status_code == 200
+        assert app.node.channel_range("ai", 4, 0) == (-32000, 32000)
+        # layout exposes the signed range
+        r = await client.get("/api/node")
+        ai = next(c for m in r.json()["modules"] if m["index"] == 4
+                  for c in m["channels"] if c["address"] == "AI4.0")
+        assert ai["range"] == {"min": -32000, "max": 32000}
+
+    async def test_range_floor_is_minus_65534(self, client):
+        r = await client.put("/api/config/channel-ranges", json={
+            "channel_ranges": {"AI4.0": {"min": -65535, "max": 0}}, "persist": False})
+        assert r.status_code == 400            # below -65534
+
+    async def test_signed_value_display_and_write(self, client, app, datastore):
+        # channel with a negative-min range -> signed two's-complement view
+        await client.put("/api/config/channel-ranges", json={
+            "channel_ranges": {"AI4.0": {"min": -32000, "max": 32000}},
+            "persist": False})
+        r = await client.post("/api/channels/ai/4/0", json={"value": -2000})
+        assert r.status_code == 200
+        # raw image holds the two's-complement word
+        assert datastore.get_input_word(0) == (-2000) & 0xFFFF
+        # values API shows the signed number again
+        r = await client.get("/api/values")
+        entry = next(v for v in r.json()["values"]
+                     if (v["kind"], v["module"], v["channel"]) == ("ai", 4, 0))
+        assert entry["value"] == -2000
+
+    async def test_negative_ao_force(self, client, datastore):
+        r = await client.post("/api/channels/ao/5/0", json={"value": -3000})
+        assert r.status_code == 200
+        assert datastore.get_output_word(0) == (-3000) & 0xFFFF
+        # unsigned AO (default range) still displays raw
+        r = await client.get("/api/values")
+        entry = next(v for v in r.json()["values"]
+                     if (v["kind"], v["module"], v["channel"]) == ("ao", 5, 0))
+        assert entry["value"] == (-3000) & 0xFFFF
+
+    async def test_value_bounds_rejected(self, client):
+        r = await client.post("/api/channels/ai/4/0", json={"value": -65535})
+        assert r.status_code == 400
+        r = await client.post("/api/channels/ai/4/0", json={"value": 65536})
+        assert r.status_code == 400
+        r = await client.post("/api/channels/ai/4/0", json={"value": "banana"})
+        assert r.status_code == 400
+
     async def test_ranges_persist_to_yaml(self, client, app, tmp_path):
         cfg_file = tmp_path / "node.yaml"
         app.node_config_path = str(cfg_file)