cmd(git): Stub out branch

Author: tony

src/libvcs/cmd/git.py

@@ -2959,9 +2959,15 @@ def save(
 GitBranchCommandLiteral = Literal[
     "create",  # checkout -b
     "checkout",  # checkout
+    "_list",
     "move",  # branch -m, or branch -M with force
     "copy",  # branch -c, or branch -C with force
     "delete",  # branch -d, or branch -D /ith force
+    "set_upstream",
+    "unset_upstream",
+    "track",
+    "no_track",
+    "edit_description",
 ]
 
 
@@ -3035,3 +3041,35 @@ def run(
             check_returncode=check_returncode,
             log_in_real_time=log_in_real_time,
         )
+
+    def checkout(self, *, branch: str) -> str:
+        """Git branch checkout.
+
+        Examples
+        --------
+        >>> GitBranchCmd(path=git_local_clone.path).checkout(branch='master')
+        "Your branch is up to date with 'origin/master'."
+        """
+        return self.cmd.run(
+            [
+                "checkout",
+                *[branch],
+            ],
+        )
+
+    def create(self, *, branch: str) -> str:
+        """Create a git branch.
+
+        Examples
+        --------
+        >>> GitBranchCmd(path=git_local_clone.path).create(branch='master')
+        "fatal: a branch named 'master' already exists"
+        """
+        return self.cmd.run(
+            [
+                "checkout",
+                *["-b", branch],
+            ],
+            # Pass-through to run()
+            check_returncode=False,
+        )