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) 52