Restore numpy in sys.modules after test_no_numpy_int_type

CHANGELOG.md

@@ -5,6 +5,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 ## Unreleased
 
 ### Fixed
+- Fix the test suite leaving `numpy` removed from `sys.modules` after `test_no_numpy_int_type` runs, which broke any later test importing `numpy` in the same pytest process [[#4852](https://github.com/plotly/plotly.py/issues/4852)]
 - Fix `mpl_to_plotly` tick marker mirroring, axis positioning, and trace visibility for twinned and overlaid subplots (such as `twinx` and `twiny`) [[#5310](https://github.com/plotly/plotly.py/pull/5310)], with thanks to @robertoffmoura for the contribution!
 - Fix `mpl_to_plotly` losing matplotlib axis line colors by exporting the color of each axis's displayed spine to the plotly x and y axis `linecolor` [[#5311](https://github.com/plotly/plotly.py/pull/5311)], with thanks to @robertoffmoura for the contribution!
 - Fix concurrent first access to lazily initialized graph object properties, which could raise `ValueError("Invalid value")` [[#5691](https://github.com/plotly/plotly.py/pull/5691)], with thanks to @hb1915 for the contribution!

tests/test_optional/test_utils/test_utils.py

@@ -491,10 +491,15 @@ def test_no_numpy_int_type(self):
         from _plotly_utils.optional_imports import get_module
 
         np = get_module("numpy", should_load=False)
+        saved_numpy = None
         if np:
-            sys.modules.pop("numpy")
+            saved_numpy = sys.modules.pop("numpy")
 
-        int_type_tuple = _get_int_type()
-        expected_tuple = (int,)
+        try:
+            int_type_tuple = _get_int_type()
+            expected_tuple = (int,)
 
-        self.assertEqual(int_type_tuple, expected_tuple)
+            self.assertEqual(int_type_tuple, expected_tuple)
+        finally:
+            if saved_numpy is not None:
+                sys.modules["numpy"] = saved_numpy