test: fix the weak assertions from the S6/S7 audit

The Hyprland socket check passed a shell glob to `test -S`, which breaks at both edges: zero matches leaves the literal pattern and several instances pass multiple args, failing for reasons unrelated to the socket. It now resolves one socket with find -type s.

The gen_tokens degenerate-marker test asserted properties loose enough to pass on garbled output. It now pins the exact reconstruction as a characterization, with the impossible-input caveat stated, so any change to the branch surfaces.

The gallery tick count leaned on split-string omit-nulls arithmetic that happened to equal the match count. It now counts occurrences directly. gallery-widget-write-svg, the last uncovered public entry point, gets a Normal-case test.

1 files changed, 7 insertions, 3 deletions

diff --git a/tests/gallery-tokens/test_gen_tokens.py b/tests/gallery-tokens/test_gen_tokens.py
index b9fbb50..2968119 100644
--- a/tests/gallery-tokens/test_gen_tokens.py
+++ b/tests/gallery-tokens/test_gen_tokens.py
@@ -181,11 +181,15 @@ class ReplaceBetweenMarkers(unittest.TestCase):
     def test_start_marker_on_final_line_without_newline(self):
         # Defensive branch: no newline after the start marker. The guard must
         # not let text[:si-of-newline+1] collapse to "" and wipe the prefix.
+        # This input cannot occur in the real HTML (markers always sit on
+        # their own newline-terminated lines), so the exact-string assert is a
+        # characterization: the prefix survives, and the reconstruction's
+        # duplicated start marker is pinned deliberately so any change to the
+        # branch surfaces here instead of passing unnoticed.
         src = f"keep\n{self.START} {self.END}"
         out = gt.replace_between_markers(src, self.START, self.END, "X")
-        self.assertTrue(out.startswith("keep\n"))
-        self.assertIn(self.END, out)
-        self.assertIn("X", out)
+        self.assertEqual(
+            out, f"keep\n{self.START} X\n{self.START} {self.END}")
 
 
 class RealTokensJson(unittest.TestCase):