fix: update tests for path_append env dict change

nanobot/agent/tools/shell.py

@@ -255,6 +255,7 @@ class ExecTool(Tool):
         home = os.environ.get("HOME", "/tmp")
         env = {
             "HOME": home,
+            "PATH": os.environ.get ("PATH", "/usr/bin:/bin"),
             "LANG": os.environ.get("LANG", "C.UTF-8"),
             "TERM": os.environ.get("TERM", "dumb"),
         }

tests/tools/test_exec_platform.py

@@ -27,7 +27,7 @@ class TestBuildEnvUnix:
     def test_expected_keys(self):
         with patch("nanobot.agent.tools.shell._IS_WINDOWS", False):
             env = ExecTool()._build_env()
-        expected = {"HOME", "LANG", "TERM"}
+        expected = {"HOME", "LANG", "PATH","TERM"}
         assert expected <= set(env)
         if sys.platform != "win32":
             assert set(env) == expected
@@ -149,22 +149,31 @@ class TestPathAppendPlatform:
 
     @pytest.mark.asyncio
     async def test_unix_injects_export (self):
-        """On Unix, path_append is an export statement prepended to command."""
+        """On Unix, path_append is passed via the env dict, not shell string."""
         mock_proc = AsyncMock ()
         mock_proc.communicate.return_value = (b"ok", b"")
         mock_proc.returncode = 0
 
+        captured_cmd = None
+        captured_env = {}
+
+        async def capture_spawn (cmd, cwd, env):
+            nonlocal captured_cmd
+            captured_cmd = cmd
+            captured_env.update (env)
+            return mock_proc
+
         with (
             patch ("nanobot.agent.tools.shell._IS_WINDOWS", False),
-            patch.object(ExecTool, "_spawn", return_value=mock_proc) as mock_spawn,
+            patch.object (ExecTool, "_spawn", side_effect=capture_spawn),
             patch.object (ExecTool, "_guard_command", return_value=None),
         ):
             tool = ExecTool (path_append="/opt/bin")
             await tool.execute (command="ls")
 
-        spawned_cmd = mock_spawn.call_args[0][0]
+        # path_append must be in the env dict, NOT injected into the command
-        assert 'export PATH="$PATH:/opt/bin"' in spawned_cmd
+        assert captured_cmd == "ls"
-        assert spawned_cmd.endswith("ls")
+        assert captured_env["PATH"].endswith (":/opt/bin")
 
     @pytest.mark.asyncio
     async def test_windows_modifies_env(self):
@@ -181,6 +190,7 @@ class TestPathAppendPlatform:
 
         with (
             patch("nanobot.agent.tools.shell._IS_WINDOWS", True),
+            patch ("nanobot.agent.tools.shell.os.pathsep", ";"),
             patch.object(ExecTool, "_spawn", side_effect=capture_spawn),
             patch.object(ExecTool, "_guard_command", return_value=None),
         ):