tests/basics: Add errno1 test, to check basics of uerrno module.

tests/basics/errno1.py

@@ -0,0 +1,15 @@
+# test errno's and uerrno module
+
+try:
+    import uerrno
+except ImportError:
+    print("SKIP")
+    import sys
+    sys.exit()
+
+# check that constants exist and are integers
+print(type(uerrno.EIO))
+
+# check that errors are rendered in a nice way
+msg = str(OSError(uerrno.EIO))
+print(msg[:7], msg[-5:])

tests/basics/errno1.py.exp

@@ -0,0 +1,2 @@
+<class 'int'>
+[Errno  ] EIO