tests: Replace umodule with module everywhere.

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

tests/extmod/re_split_empty.py

@@ -0,0 +1,23 @@
+# test splitting with pattern matches that can be empty
+#
+# CPython 3.5 issues a FutureWarning for these tests because their
+# behaviour will change in a future version.  MicroPython just stops
+# splitting as soon as an empty match is found.
+
+try:
+    import re
+except ImportError:
+    print("SKIP")
+    raise SystemExit
+
+r = re.compile(" *")
+s = r.split("a b    c   foobar")
+print(s)
+
+r = re.compile("x*")
+s = r.split("foo")
+print(s)
+
+r = re.compile("x*")
+s = r.split("axbc")
+print(s)