diff --git a/changelog.md b/changelog.md
index b134e880..d5aba747 100644
--- a/changelog.md
+++ b/changelog.md
@@ -10,11 +10,8 @@ Features
 Internal
 ---------
 * Add an `AGENTS.md`.
-
-
-Internal
----------
 * Refactor `find_matches()` into smaller logical units.
+* Increase test coverage.
 
 
 1.67.1 (2026/03/28)
diff --git a/test/pytests/test_string_utils.py b/test/pytests/test_string_utils.py
new file mode 100644
index 00000000..338a797a
--- /dev/null
+++ b/test/pytests/test_string_utils.py
@@ -0,0 +1,27 @@
+# type: ignore
+
+from mycli.packages.string_utils import sanitize_terminal_title
+
+
+def test_sanitize_terminal_title_strips_ansi_sequences() -> None:
+    title = '\x1b[31mmycli\x1b[0m session'
+
+    assert sanitize_terminal_title(title) == 'mycli session'
+
+
+def test_sanitize_terminal_title_replaces_newlines_with_spaces() -> None:
+    title = 'schema\nquery\r\nprompt'
+
+    assert sanitize_terminal_title(title) == 'schema query prompt'
+
+
+def test_sanitize_terminal_title_removes_control_characters() -> None:
+    title = 'my\x00cl\ti\x1f title\x7f'
+
+    assert sanitize_terminal_title(title) == 'mycli title'
+
+
+def test_sanitize_terminal_title_preserves_printable_text() -> None:
+    title = 'db-01 / reporting'
+
+    assert sanitize_terminal_title(title) == 'db-01 / reporting'