chore: add test case to branch name with period works

Add a test case to show that a branch name with a period can be
fetched with a `get()`

Closes: #1715

tests/functional/api/test_branches.py

@@ -0,0 +1,17 @@
+"""
+GitLab API:
+https://docs.gitlab.com/ee/api/branches.html
+"""
+
+
+def test_branch_name_with_period(project):
+    # Make sure we can create and get a branch name containing a period '.'
+    branch_name = "my.branch.name"
+    branch = project.branches.create({"branch": branch_name, "ref": "main"})
+    assert branch.name == branch_name
+
+    # Ensure we can get the branch
+    fetched_branch = project.branches.get(branch_name)
+    assert branch.id == fetched_branch.id
+
+    branch.delete()