Add testing for Fundamental spaces with full coverage (#3048)

* initial commit

* Fix the multi-binary sample and upgrade multi-discrete sample

* Fix MultiBinary sample tests and pre-commit

* Adds coverage tests and updates test_utils.py to use the utils.py spaces. Fix bug in text.py

* pre-commit

tests/spaces/test_space.py

@@ -0,0 +1,24 @@
+from functools import partial
+
+import pytest
+
+from gym import Space
+from gym.spaces import utils
+
+TESTING_SPACE = Space()
+
+
+@pytest.mark.parametrize(
+    "func",
+    [
+        TESTING_SPACE.sample,
+        partial(TESTING_SPACE.contains, None),
+        partial(utils.flatdim, TESTING_SPACE),
+        partial(utils.flatten, TESTING_SPACE, None),
+        partial(utils.flatten_space, TESTING_SPACE),
+        partial(utils.unflatten, TESTING_SPACE, None),
+    ],
+)
+def test_not_implemented_errors(func):
+    with pytest.raises(NotImplementedError):
+        func()