Move tests in basic/tests/ up one level preparating to multiple test dirs.

tests/basics/string-slice.py

@@ -0,0 +1,32 @@
+print("123"[0:1])
+
+print("123"[0:2])
+
+print("123"[:1])
+
+print("123"[1:])
+
+# Idiom for copying sequence
+print("123"[:])
+
+print("123"[:-1])
+
+# Weird cases
+print("123"[0:0])
+print("123"[1:0])
+print("123"[1:1])
+print("123"[-1:-1])
+print("123"[-3:])
+print("123"[-3:3])
+print("123"[0:])
+print("123"[:0])
+print("123"[:-3])
+print("123"[:-4])
+# Range check testing, don't segfault, please ;-)
+print("123"[:1000000])
+print("123"[1000000:])
+print("123"[:-1000000])
+print("123"[-1000000:])
+# No IndexError!
+print(""[1:1])
+print(""[-1:-1])