class InterpreterTest(unittest.TestCase):
"""Tests the interpreter
Other tests test are based on R5Rs, such as tail-recursion and
static bindings.
"""
def __init__(self, *args):
unittest.TestCase.__init__(self, *args)
self.interpreter = Interpreter()
def eval(self, expression):
return self.interpreter.eval(expression)
def assertEval(self, expression, result):
"""Asserts that the specified expression evaluates to the
specified result.
"""
eval = self.interpreter.eval(expression)
self.failIf(eval != result,
"%s => %s, expected %s"
% (expression, eval, result))
def assertFEval(self, expression, floatResult, epsilon=0.0001):
"""Asserts that the specified expressions evaluates to a
number that differs at most epsilon from floatResult.
"""
eval = self.interpreter.eval(expression)
self.failIf(abs(floatResult - eval) > epsilon,
"%s ==> %f, expected %f"
% (expression, eval, floatResult))
def assertError(self, expression):
"""Asserts that the specified expression raises an error at
evaluation.
"""
try:
self.interpreter.eval(expression)
except Exception:
return
fail(expression + " did not raise an exception")
def __init__(self, *args):
unittest.TestCase.__init__(self, *args)
self.interpreter = Interpreter()
