tests/basic: Make various tests skippable.

tests/basics/bytes_construct_array.py

@@ -0,0 +1,11 @@
+# test construction of bytes from different objects
+try:
+    from array import array
+except ImportError:
+    import sys
+    print("SKIP")
+    sys.exit()
+
+# arrays
+print(bytes(array('b', [1, 2])))
+print(bytes(array('h', [0x101, 0x202])))