#!/usr/bin/env python
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__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

"""
Test Environments are functional and return None when no lex tool is found.
"""

import TestSCons

test = TestSCons.TestSCons()

test.write('SConstruct', """
import SCons

def no_lex(env, key_program, default_paths=[]):
    return None

class TestEnvironment(SCons.Environment.Environment):
    def Detect(self, progs):
        return None

SCons.Tool.find_program_path = no_lex

foo = TestEnvironment(tools=['default', 'lex'])
print(foo.Dictionary('LEX'))
""" % locals())

test.run(arguments = '-Q -s', stdout = 'None\n' )

test.pass_test()

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