test(legacy_api/common): Derive next_version from TMUX_MAX_VERSION

Author: tony

tests/legacy_api/test_common.py

@@ -32,6 +32,17 @@
 version_regex = re.compile(r"([0-9]\.[0-9])|(master)")
 
 
+def _get_next_tmux_version() -> str:
+    """Derive next tmux version from TMUX_MAX_VERSION.
+
+    Strips trailing letters and increments minor version.
+    E.g., "3.5a" -> "3.6"
+    """
+    base = re.sub(r"[a-z]+$", "", TMUX_MAX_VERSION)
+    major, minor = base.split(".")
+    return f"{major}.{int(minor) + 1}"
+
+
 def test_allows_master_version(monkeypatch: pytest.MonkeyPatch) -> None:
     """Assert get_version() works with builds from git trunk."""
 
@@ -54,10 +65,10 @@ def mock_tmux_cmd(*args: t.Any, **kwargs: t.Any) -> Hi:
 
 def test_allows_next_version(monkeypatch: pytest.MonkeyPatch) -> None:
     """Assert get_version() supports next version."""
-    TMUX_NEXT_VERSION = "3.6"
+    next_version = _get_next_tmux_version()
 
     class Hi:
-        stdout: t.ClassVar = [f"tmux next-{TMUX_NEXT_VERSION}"]
+        stdout: t.ClassVar = [f"tmux next-{next_version}"]
         stderr = None
 
     def mock_tmux_cmd(*args: t.Any, **kwargs: t.Any) -> Hi:
@@ -68,7 +79,7 @@ def mock_tmux_cmd(*args: t.Any, **kwargs: t.Any) -> Hi:
     assert has_minimum_version()
     assert has_gte_version(TMUX_MIN_VERSION)
     assert has_gt_version(TMUX_MAX_VERSION), "Greater than the max-supported version"
-    assert get_version() == TMUX_NEXT_VERSION
+    assert get_version() == next_version
 
 
 def test_get_version_openbsd(monkeypatch: pytest.MonkeyPatch) -> None: