From a1ed0b7dbcea240a421d81a64ffa4fd767257d74 Mon Sep 17 00:00:00 2001
From: Kevin Sheppard <bashtage@users.noreply.github.com>
Date: Thu, 2 Oct 2025 18:37:05 +0100
Subject: [PATCH] TST: Add a test for _build

---
 arch/meson.build         |  1 +
 arch/tests/test_build.py | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)
 create mode 100644 arch/tests/test_build.py

diff --git a/arch/meson.build b/arch/meson.build
index 92d4360532..366cd31239 100644
--- a/arch/meson.build
+++ b/arch/meson.build
@@ -71,6 +71,7 @@ subdir('univariate')
 
 subdirs_list = [
     '__future__',
+    '_build',
     'bootstrap',
     'compat',
     'covariance',
diff --git a/arch/tests/test_build.py b/arch/tests/test_build.py
new file mode 100644
index 0000000000..fc9383a27e
--- /dev/null
+++ b/arch/tests/test_build.py
@@ -0,0 +1,36 @@
+import tempfile
+
+import pytest
+
+from arch import __version__, version_tuple
+
+try:
+    from arch._build.git_version import get_version, write_version_file
+
+    HAS_SETUPTOOLS_SCM = True
+except ImportError:
+    HAS_SETUPTOOLS_SCM = False
+
+
+@pytest.mark.skipif(not HAS_SETUPTOOLS_SCM, reason="setuptools_scm is not installed")
+def test_get_version():
+    try:
+        version, version_fields = get_version()
+
+        assert isinstance(version, str)
+        assert isinstance(version_fields, tuple)
+        assert all(isinstance(v, (int, str)) for v in version_fields)
+    except LookupError:
+        pytest.skip("No git repository found")
+
+
+@pytest.mark.skipif(not HAS_SETUPTOOLS_SCM, reason="setuptools_scm is not installed")
+def test_write_version_file():
+    with tempfile.NamedTemporaryFile(delete=False) as tmpfile:
+
+        write_version_file(tmpfile.name, __version__, version_tuple)
+        with open(tmpfile.name, "r") as f:
+            content = f.read()
+
+            assert f"__version__ = version = '{__version__}'" in content
+            assert f"__version_tuple__ = version_tuple = {version_tuple}" in content