fix: one failure line per file, tests stay local

tests/netguard/sitecustomize.py

@@ -27,7 +27,9 @@ _SAVED: dict = {}
 
 def _refuse(host: object) -> None:
     where = os.environ.get(NETLOG)
-    if where:
+    # A name under .invalid never resolves (RFC 2606): a test names one to
+    # fail on purpose, refused here before its DNS query leaves.
+    if where and not str(host).endswith(".invalid"):
         with open(where, "a", encoding="utf-8") as log:
             log.write(f"{os.getpid()} {host} {' '.join(sys.argv)[:300]}\n")
     raise OSError(errno.ENETUNREACH, f"a test makes no request to {host}")

tests/test_install.py

@@ -10,6 +10,7 @@ import io
 import json
 import os
 import stat
+import select
 import shlex
 import re
 import shutil
@@ -4182,17 +4183,35 @@ class AQuestionLeftWithCtrlDOrCtrlCIsAStop(unittest.TestCase):
 
         home = Path(_tempdir(self))
         master, slave = pty.openpty()
+        # Its output on the terminal too: piped, nothing is asked, and the
+        # test skipped on every machine.
         proc = subprocess.Popen(
-            [sys.executable, "install.py"], cwd=REPO_ROOT, stdin=slave,
-            stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True,
-            env={**os.environ, "HOME": str(home), "RETROBIOS_OS": "linux"},
+            [sys.executable, "install.py", "--plain"], cwd=REPO_ROOT, stdin=slave,
+            stdout=slave, stderr=slave,
+            # No request leaves the machine: the standalone emulators' lists
+            # come from the network (code_audit_24 P3-13).
+            env={**os.environ, "HOME": str(home), "RETROBIOS_OS": "linux",
+                 "RETROBIOS_INSTALL_OFFLINE": "1"},
         )
         os.close(slave)
         self.addCleanup(os.close, master)
-        time.sleep(3)
+        out = ""
+        deadline = time.monotonic() + 60
+        while "Which setup?" not in out and proc.poll() is None \
+                and time.monotonic() < deadline:
+            if select.select([master], [], [], 0.2)[0]:
+                out += os.read(master, 65536).decode("utf-8", "replace")
         os.write(master, b"\x04")
-        out, _ = proc.communicate(timeout=60)
-        if "Choose the platform" not in out:
+        proc.wait(timeout=60)
+        while select.select([master], [], [], 0.2)[0]:
+            try:
+                chunk = os.read(master, 65536)
+            except OSError:
+                break
+            if not chunk:
+                break
+            out += chunk.decode("utf-8", "replace")
+        if "Which setup?" not in out:
             self.skipTest("a platform was detected on this machine")
         self.assertEqual(proc.returncode, 130, out)
         self.assertIn("Stopped", out)
@@ -5211,6 +5230,8 @@ class EventsDescribeTheRun(unittest.TestCase, _SyntheticTree):
             # The systems Choose systems lists, before the files are read.
             {"event": "choices", "platform": "retroarch",
              "systems": ["sys-a", "sys-b", "other"]},
+            # Nothing set aside before the choice (code_audit_24 P3-3).
+            {"event": "set_aside", "platform": "retroarch", "dests": []},
             # a.bin and b.bin are in place: the first read and the last.
             {"event": "checking", "files_done": 1, "files_total": 2},
             {"event": "checking", "files_done": 2, "files_total": 2},

tests/test_install_tui.py

@@ -823,9 +823,16 @@ class Widgets(unittest.TestCase):
         state = fresh_state()
         press(state, "up")
         self.assertEqual(state.focus["setup"], 2)
-        state = self.systems_state(20)
+        state = fresh_state()
+        state.stack = ["setup", "platforms"]
         press(state, "up")
-        self.assertEqual(state.focus["systems"], 0)
+        self.assertEqual(state.focus["platforms"], 0)
+        # A list of ticks wraps at any length: None and Done, at its end,
+        # are a few presses up from its first item (tui_audit_17 P3-1).
+        state = self.systems_state(20)
+        state.focus["systems"] = 0
+        press(state, "up")
+        self.assertEqual(install.tui_rows(state)[state.focus["systems"]].action, "done")
 
     def test_filter_ignores_case_and_accents(self):
         state = self.systems_state(3)
@@ -6777,7 +6784,12 @@ class AuditSevenScreens(unittest.TestCase):
         with SaveDirectoryRepository() as repo:
             argv = ["install.py", "--platform", "retroarch", "--dest", str(repo.dest),
                     "--manifest", str(repo.root / "install" / "retroarch.json")]
+            # The files come from the repository on the loopback: the module
+            # read its base before the environment named it (code_audit_24
+            # P3-13).
+            served = repo.env()["RETROBIOS_BASE_URL"] + "/{path}"
             with mock.patch.dict(os.environ, repo.env()), \
+                    mock.patch.object(install, "RAW_FILE_URL", served), \
                     mock.patch.object(sys, "argv", argv), \
                     mock.patch.object(sys.stdin, "isatty", return_value=True), \
                     mock.patch.object(install, "_is_terminal", return_value=True), \