diff --git a/.github/workflows/check_tests.yml b/.github/workflows/check_tests.yml
new file mode 100644
index 0000000..4152a05
--- /dev/null
+++ b/.github/workflows/check_tests.yml
@@ -0,0 +1,19 @@
+name: Check Tests
+on: [ pull_request ]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'  # Specify the Python version you want to use
+          cache: pip
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install pytest
+      - name: Run tests
+        run: pytest tests/
+
diff --git a/src/stack_pr/git.py b/src/stack_pr/git.py
index da4057c..9dd45af 100644
--- a/src/stack_pr/git.py
+++ b/src/stack_pr/git.py
@@ -12,6 +12,15 @@ class GitError(Exception):
     pass
 
 
+username_override = None
+
+
+def override_username(username: str):
+    """Override username for testing purposes. Call with None to reset."""
+    global username_override
+    username_override = username
+
+
 def fetch_checkout_commit(
     repo_dir: Path, ref: str, quiet: bool, remote: str = "origin"
 ):
@@ -182,12 +191,16 @@ def check_gh_installed():
 def get_gh_username() -> str:
     """Return the current github username.
 
+    If username_override is set, it will be used instead of the actual username.
+
     Returns:
         Current github username as a string.
 
     Raises:
         GitError: if called outside a git repo, or.
     """
+    if username_override is not None:
+        return username_override
 
     user_query = get_command_output(
         [
diff --git a/tests/test_misc.py b/tests/test_misc.py
index 1587a7d..6fc22b8 100644
--- a/tests/test_misc.py
+++ b/tests/test_misc.py
@@ -3,6 +3,7 @@
 
 sys.path.append(str(Path(__file__).parent.parent / "src"))
 
+from stack_pr.git import override_username
 from stack_pr.cli import (
     get_branch_id,
     generate_branch_name,
@@ -16,6 +17,7 @@
 
 @pytest.fixture(scope="module")
 def username():
+    override_username("TestBot")
     return get_gh_username()
 
 
@@ -51,33 +53,38 @@ def test_generate_branch_name():
 
 
 def test_get_taken_branch_ids():
-    template = "User/stack/$ID"
+    template = "$USERNAME/stack/$ID"
     refs = [
-        "refs/remotes/origin/User/stack/104",
-        "refs/remotes/origin/User/stack/105",
-        "refs/remotes/origin/User/stack/134",
+        "refs/remotes/origin/TestBot/stack/104",
+        "refs/remotes/origin/TestBot/stack/105",
+        "refs/remotes/origin/TestBot/stack/134",
     ]
     assert get_taken_branch_ids(refs, template) == [104, 105, 134]
-    refs = ["User/stack/104", "User/stack/105", "User/stack/134"]
+    refs = ["TestBot/stack/104", "TestBot/stack/105", "TestBot/stack/134"]
     assert get_taken_branch_ids(refs, template) == [104, 105, 134]
-    refs = ["User/stack/104", "AAAA/stack/105", "User/stack/134", "User/stack/bbb"]
+    refs = [
+        "TestBot/stack/104",
+        "AAAA/stack/105",
+        "TestBot/stack/134",
+        "TestBot/stack/bbb",
+    ]
     assert get_taken_branch_ids(refs, template) == [104, 134]
 
 
 def test_generate_available_branch_name():
-    template = "User/stack/$ID"
+    template = "$USERNAME/stack/$ID"
     refs = [
-        "refs/remotes/origin/User/stack/104",
-        "refs/remotes/origin/User/stack/105",
-        "refs/remotes/origin/User/stack/134",
+        "refs/remotes/origin/TestBot/stack/104",
+        "refs/remotes/origin/TestBot/stack/105",
+        "refs/remotes/origin/TestBot/stack/134",
     ]
-    assert generate_available_branch_name(refs, template) == "User/stack/135"
+    assert generate_available_branch_name(refs, template) == "TestBot/stack/135"
     refs = []
-    assert generate_available_branch_name(refs, template) == "User/stack/1"
-    template = "User-stack-$ID"
+    assert generate_available_branch_name(refs, template) == "TestBot/stack/1"
+    template = "$USERNAME-stack-$ID"
     refs = [
-        "refs/remotes/origin/User-stack-104",
-        "refs/remotes/origin/User-stack-105",
-        "refs/remotes/origin/User-stack-134",
+        "refs/remotes/origin/TestBot-stack-104",
+        "refs/remotes/origin/TestBot-stack-105",
+        "refs/remotes/origin/TestBot-stack-134",
     ]
-    assert generate_available_branch_name(refs, template) == "User-stack-135"
+    assert generate_available_branch_name(refs, template) == "TestBot-stack-135"