diff --git a/tests/vcs/git/test_backend.py b/tests/vcs/git/test_backend.py
index ac619de55ca..a34ad21ce8f 100644
--- a/tests/vcs/git/test_backend.py
+++ b/tests/vcs/git/test_backend.py
@@ -4,9 +4,13 @@
 
 import pytest
 
+from dulwich.client import FetchPackResult
 from dulwich.repo import Repo
+from tests.helpers import MOCK_DEFAULT_GIT_REVISION
 
+from poetry.packages.direct_origin import _get_package_from_git
 from poetry.vcs.git.backend import Git
+from poetry.vcs.git.backend import GitRefSpec
 from poetry.vcs.git.backend import annotated_tag
 from poetry.vcs.git.backend import is_revision_sha
 from poetry.vcs.git.backend import urlpathjoin
@@ -15,6 +19,36 @@
 VALID_SHA = "c5c7624ef64f34d9f50c3b7e8118f7f652fddbbd"
 
 
+@pytest.fixture(autouse=True)
+def git_mock() -> Repo:
+    repo = MagicMock(spec=Repo)
+
+    repo.get_config.return_value.get.return_value = (
+        b"https://github.com/python-poetry/poetry.git"
+    )
+
+    repo.head.return_value = MOCK_DEFAULT_GIT_REVISION.encode("utf-8")
+
+    # Clear any cache in the Git module
+    _get_package_from_git.cache_clear()
+
+    return repo
+
+
+@pytest.fixture()
+def fetch_pack_result() -> MagicMock:
+    mock_fetch_pack_result = MagicMock(spec=FetchPackResult)
+    mock_fetch_pack_result.refs = {
+        b"refs/heads/main": b"abc123",
+        b"refs/tags/v1.0.0": b"def456",
+        annotated_tag(b"refs/tags/v1.0.0"): b"def456",
+        b"HEAD": b"abc123",
+    }
+    mock_fetch_pack_result.symrefs = {b"HEAD": b"refs/heads/main"}
+
+    return mock_fetch_pack_result
+
+
 def test_invalid_revision_sha() -> None:
     result = is_revision_sha("invalid_input")
     assert result is False
@@ -55,15 +89,26 @@ def test_annotated_tag(tag: str | bytes) -> None:
     assert tag == b"my-tag^{}"
 
 
-def test_get_remote_url() -> None:
-    repo = MagicMock(spec=Repo)
-    repo.get_config.return_value.get.return_value = (
-        b"https://github.com/python-poetry/poetry.git"
-    )
+def test_get_remote_url(git_mock: Repo) -> None:
+    repo = git_mock
 
     assert Git.get_remote_url(repo) == "https://github.com/python-poetry/poetry.git"
 
 
+def test_get_revision(git_mock: Repo) -> None:
+    assert Git.get_revision(git_mock) == MOCK_DEFAULT_GIT_REVISION
+
+
+def test_info(git_mock: Repo) -> None:
+    repo = git_mock
+    info = Git.info(repo)
+
+    assert info.origin == "https://github.com/python-poetry/poetry.git"
+    assert (
+        info.revision == MOCK_DEFAULT_GIT_REVISION
+    )  # revision already mocked in helper
+
+
 @pytest.mark.parametrize(
     "url, expected_result",
     [
@@ -75,3 +120,54 @@ def test_urlpathjoin(url: str, expected_result: str) -> None:
     path = "../other-repo"
     result = urlpathjoin(url, path)
     assert result == expected_result
+
+
+def test_git_refspec() -> None:
+    git_ref = GitRefSpec("main", "1234", "v2")
+
+    assert git_ref.branch == "main"
+    assert git_ref.revision == "1234"
+    assert git_ref.tag == "v2"
+    assert git_ref.ref == b"HEAD"
+
+
+@pytest.mark.parametrize(
+    "refspec_params, expected_ref, expected_branch, expected_revision, expected_tag",
+    [
+        ({"branch": "main"}, b"refs/heads/main", "main", None, None),
+        (
+            {"revision": "v1.0.0"},
+            annotated_tag(b"refs/tags/v1.0.0"),
+            None,
+            None,
+            "v1.0.0",
+        ),
+        ({"revision": "abc"}, b"refs/heads/main", None, "abc", None),
+    ],
+)
+def test_git_ref_spec_resolve(
+    fetch_pack_result: FetchPackResult,
+    refspec_params: dict[str, str | bytes | None],
+    expected_ref: bytes,
+    expected_branch: str,
+    expected_revision: str,
+    expected_tag: str,
+) -> None:
+    """
+    Parameterized test for GitRefSpec resolve with different parameters.
+
+    Args:
+        fetch_pack_result (FetchPackResult): The mocked FetchPackResult object.
+        refspec_params (dict): Parameters for creating GitRefSpec.
+        expected_ref (bytes): The expected resolved ref.
+        expected_branch (str): The expected resolved branch.
+        expected_revision (str): The expected resolved revision.
+        expected_tag (str): The expected resolved tag.
+    """
+    refspec = GitRefSpec(**refspec_params)
+    refspec.resolve(fetch_pack_result)
+
+    assert refspec.ref == expected_ref
+    assert refspec.branch == expected_branch
+    assert refspec.revision == expected_revision
+    assert refspec.tag == expected_tag