Add deps tests.

Author: fabiocaccamo

tests/test_deps.py

@@ -0,0 +1,25 @@
+import sys
+from types import ModuleType
+from unittest import mock
+
+import pytest
+
+from fsutil.deps import require_requests
+
+
+def test_require_requests_installed():
+    with mock.patch.dict(sys.modules, {"requests": mock.Mock(spec=ModuleType)}):
+        requests_module = require_requests()
+        assert isinstance(requests_module, ModuleType)
+
+
+def test_require_requests_not_installed():
+    with mock.patch.dict(sys.modules, {"requests": None}):
+        with pytest.raises(
+            ModuleNotFoundError, match="'requests' module is not installed"
+        ):
+            require_requests()
+
+
+if __name__ == "__main__":
+    pytest.main()