tests/basics: Add tests to improve coverage of binary.c.

tests/basics/array_micropython.py

+# test MicroPython-specific features of array.array
+import array
+
+# arrays of objects
+a = array.array('O')
+a.append(1)
+print(a[0])
+
+# arrays of pointers
+a = array.array('P')
+a.append(1)
+print(a[0])

tests/basics/array_micropython.py.exp

+1
+1

tests/basics/struct1.py

@@ -61,6 +61,10 @@ print(struct.unpack(">q", b"\xf2\x34\x56\x78\x90\x12\x34\x56"))
 print(struct.unpack("<I", b"\xff\xff\xff\xff"))
 print(struct.unpack("<Q", b"\xff\xff\xff\xff\xff\xff\xff\xff"))
 
+# check small int overflow
+print(struct.unpack("<i", b'\xff\xff\xff\x7f'))
+print(struct.unpack("<q", b'\xff\xff\xff\xff\xff\xff\xff\x7f'))
+
 # network byte order
 print(struct.pack('!i', 123))
 

tests/basics/struct_micropython.py

+# test MicroPython-specific features of struct
+
+try:
+    import ustruct as struct
+except:
+    try:
+        import struct
+    except ImportError:
+        import sys
+        print("SKIP")
+        sys.exit()
+
+class A():
+    pass
+
+# pack and unpack objects
+o = A()
+s = struct.pack("<O", o)
+o2 = struct.unpack("<O", s)
+print(o is o2[0])

tests/basics/struct_micropython.py.exp

+True