1# Predeclared built-ins for this module:
2#
3# error(msg): report an error in Go's test framework without halting execution.
4# This is distinct from the built-in fail function, which halts execution.
5# catch(f): evaluate f() and returns its evaluation error message, if any
6# matches(str, pattern): report whether str matches regular expression pattern.
7# module(**kwargs): a constructor for a module.
8# _freeze(x): freeze the value x and everything reachable from it.
9#
10# Clients may use these functions to define their own testing abstractions.
11
12def _eq(x, y):
13 if x != y:
14 error("%r != %r" % (x, y))
15
16def _ne(x, y):
17 if x == y:
18 error("%r == %r" % (x, y))
19
20def _true(cond, msg = "assertion failed"):
21 if not cond:
22 error(msg)
23
24def _lt(x, y):
25 if not (x < y):
26 error("%s is not less than %s" % (x, y))
27
28def _contains(x, y):
29 if y not in x:
30 error("%s does not contain %s" % (x, y))
31
32def _fails(f, pattern):
33 "assert_fails asserts that evaluation of f() fails with the specified error."
34 msg = catch(f)
35 if msg == None:
36 error("evaluation succeeded unexpectedly (want error matching %r)" % pattern)
37 elif not matches(pattern, msg):
38 error("regular expression (%s) did not match error (%s)" % (pattern, msg))
39
40freeze = _freeze # an exported global whose value is the built-in freeze function
41
42assert = module(
43 "assert",
44 fail = error,
45 eq = _eq,
46 ne = _ne,
47 true = _true,
48 lt = _lt,
49 contains = _contains,
50 fails = _fails,
51)
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