A test of the struct module

Lib/test/test_struct.py

@@ -0,0 +1,44 @@
+import struct
+## import pdb
+
+def simple_err(func, *args):
+    try:
+	apply(func, args)
+    except struct.error:
+	pass
+    else:
+	print 'expected struct.error not caught'
+## 	pdb.set_trace()
+
+simple_err(struct.calcsize, 'Q')
+
+sz = struct.calcsize('i')
+if sz * 3 <> struct.calcsize('iii'):
+    print 'inconsistent sizes'
+
+sz = struct.calcsize('cbhilfd')
+if sz * 3 <> struct.calcsize('3c3b3h3i3l3f3d'):
+    print 'inconsistent sizes'
+
+simple_err(struct.pack, 'iii', 3)
+simple_err(struct.pack, 'i', 3, 3, 3)
+simple_err(struct.pack, 'i', 'foo')
+simple_err(struct.unpack, 'd', 'flap')
+s = struct.pack('ii', 1, 2)
+simple_err(struct.unpack, 'iii', s)
+simple_err(struct.unpack, 'i', s)
+
+c = 'a'
+b = -1
+h = 255
+i = 65535
+l = 65536
+f = 3.1415
+d = 3.1415
+
+s = struct.pack('xcbhilfd', c, b, h, i, l, f, d)
+cp, bp, hp, ip, lp, fp, dp = struct.unpack('xcbhilfd', s)
+if cp <> c or bp <> b or hp <> h or ip <> i or lp <> l or \
+   int(100 * fp) <> int(100 * f) or int(100 * dp) <> int(100 * d):
+   # ^^^ calculate only to two decimal places
+    print 'unpack/pack not transitive'

Lib/test/testall.py

@@ -21,6 +21,7 @@
 	 'test_rgbimg',
 	 'test_select',
 	 'test_strftime',
+	 'test_struct',
 	 ]
 
 if __name__ == '__main__':