How to use the easybuild.tools.filetools.read_file function in easybuild

self.mock_stdout(True)
        ft.copy_file(to_copy, target_path)
        txt = self.get_stdout()
        self.mock_stdout(False)

        self.assertFalse(os.path.exists(target_path))
        self.assertTrue(re.search("^copied file .*/toy-0.0.eb to .*/toy.eb", txt))

        # forced copy, even in dry run mode
        self.mock_stdout(True)
        ft.copy_file(to_copy, target_path, force_in_dry_run=True)
        txt = self.get_stdout()
        self.mock_stdout(False)

        self.assertTrue(os.path.exists(target_path))
        self.assertTrue(ft.read_file(to_copy) == ft.read_file(target_path))
        self.assertEqual(txt, '')

"versionsuffix = '-two'",
            "dependencies = [('toy', '0.0', '-one')]",
        ])
        write_file(ec2, ec2_txt)

        self.test_toy_build(ec_file=self.test_prefix, verify=False)

        mod1 = os.path.join(self.test_installpath, 'modules', 'all', 'toy', '0.0-one')
        mod2 = os.path.join(self.test_installpath, 'modules', 'all', 'toy', '0.0-two')
        self.assertTrue(os.path.exists(mod1) or os.path.exists('%s.lua' % mod1))
        self.assertTrue(os.path.exists(mod2) or os.path.exists('%s.lua' % mod2))

        if os.path.exists(mod2):
            mod2_txt = read_file(mod2)
        else:
            mod2_txt = read_file('%s.lua' % mod2)

        load1_regex = re.compile('load.*toy/0.0-one', re.M)
        self.assertTrue(load1_regex.search(mod2_txt), "Pattern '%s' found in: %s" % (load1_regex.pattern, mod2_txt))

sys.stdout = fh

            args = [
                    '--software-name=somethingrandom',
                    '--robot', '.',
                    '--debug',
                    stdout_arg,
                   ]
            self.eb_main(args, logfile=dummylogfn)

            # make sure we restore
            sys.stdout.flush()
            sys.stdout = _stdout
            fancylogger.logToScreen(enable=False, stdout=True)

            outtxt = read_file(fn)

            self.assertTrue(len(outtxt) > 100, "Log messages are printed to stdout when %s is used (outtxt: %s)" % (stdout_arg, outtxt))

            # cleanup
            os.remove(fn)

        stdoutorig = sys.stdout
        sys.stdout = open("/dev/null", 'w')

        toy_ecfile = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'easyconfigs', 'toy-0.0.eb')
        self.logfile = None
        out = self.eb_main([toy_ecfile, '--debug', '-l', '--force'], raise_error=True)

        if os.path.exists(dummylogfn):
            os.remove(dummylogfn)

write_file(test_ec, read_file(toy_ec) + "\ngroup = %s\n" % str(group))

            self.mock_stdout(True)
            outtxt = self.eb_main(args, logfile=dummylogfn, do_build=True, raise_error=True, raise_systemexit=True)
            self.mock_stdout(False)

            if get_module_syntax() == 'Tcl':
                pattern = "Can't generate robust check in TCL modules for users belonging to group %s." % group_name
                regex = re.compile(pattern, re.M)
                self.assertTrue(regex.search(outtxt), "Pattern '%s' found in: %s" % (regex.pattern, outtxt))

            elif get_module_syntax() == 'Lua':
                lmod_version = os.getenv('LMOD_VERSION', 'NOT_FOUND')
                if LooseVersion(lmod_version) >= LooseVersion('6.0.8'):
                    toy_mod = os.path.join(self.test_installpath, 'modules', 'all', 'toy', '0.0.lua')
                    toy_mod_txt = read_file(toy_mod)

                    if isinstance(group, tuple):
                        group_name = group[0]
                        error_msg_pattern = "Hey, you're not in the '%s' group!" % group_name
                    else:
                        group_name = group
                        error_msg_pattern = "You are not part of '%s' group of users" % group_name

                    pattern = '\n'.join([
                        r'^if not \( userInGroup\("%s"\) \) then' % group_name,
                        r'    LmodError\("%s[^"]*"\)' % error_msg_pattern,
                        r'end$',
                    ])
                    regex = re.compile(pattern, re.M)
                    self.assertTrue(regex.search(outtxt), "Pattern '%s' found in: %s" % (regex.pattern, toy_mod_txt))
                else:

def test_dry_run(self):
        """Test dry run (long format)."""
        fd, dummylogfn = tempfile.mkstemp(prefix='easybuild-dummy', suffix='.log')
        os.close(fd)

        args = [
            os.path.join(os.path.dirname(__file__), 'easyconfigs', 'gzip-1.4-GCC-4.6.3.eb'),
            '--dry-run',  # implies enabling dependency resolution
            '--unittest-file=%s' % self.logfile,
            '--robot-paths=%s' % os.path.join(os.path.dirname(__file__), 'easyconfigs'),
        ]
        self.eb_main(args, logfile=dummylogfn)
        logtxt = read_file(self.logfile)

        info_msg = r"Dry run: printing build status of easyconfigs and dependencies"
        self.assertTrue(re.search(info_msg, logtxt, re.M), "Info message dry running in '%s'" % logtxt)
        ecs_mods = [
            ("gzip-1.4-GCC-4.6.3.eb", "gzip/1.4-GCC-4.6.3", ' '),
            ("GCC-4.6.3.eb", "GCC/4.6.3", 'x'),
        ]
        for ec, mod, mark in ecs_mods:
            regex = re.compile(r" \* \[%s\] \S+%s \(module: %s\)" % (mark, ec, mod), re.M)
            self.assertTrue(regex.search(logtxt), "Found match for pattern %s in '%s'" % (regex.pattern, logtxt))

'sources = [SOURCE_TAR_GZ]',
            'moduleclass = "tools"',
        ])

        param_regex = re.compile('^(?P[a-z0-9_]+) = |^$', re.M)

        # make sure regex finds all easyconfig parameters in the order they appear in the easyconfig
        expected = ['homepage', '', 'name', 'versionsuffix', '', 'patches', 'easyblock', '', 'toolchain', '',
                    'checksums', 'dependencies', 'version', 'description', '', 'source_urls', 'foo_extra1',
                    '', 'sources', 'moduleclass']
        self.assertEqual(param_regex.findall(rawtxt), expected)

        test_ec = os.path.join(self.test_prefix, 'test.eb')
        ec = EasyConfig(None, rawtxt=rawtxt)
        ec.dump(test_ec)
        ectxt = read_file(test_ec)

        # easyconfig parameters should be properly ordered/grouped in dumped easyconfig
        expected = ['easyblock', '', 'name', 'version', 'versionsuffix', '', 'homepage', 'description', '',
                    'toolchain', '', 'source_urls', 'sources', 'patches', 'checksums', '', 'dependencies', '',
                    'foo_extra1', '', 'moduleclass', '']
        self.assertEqual(param_regex.findall(ectxt), expected)

self.assertTrue(new_file.startswith('test.txt.bck_'))
        known_files = os.listdir(os.path.dirname(fp))
        self.assertTrue(ft.read_file(first_bck_backup), txt)
        self.assertEqual(ft.read_file(os.path.join(os.path.dirname(fp), new_file)), new_txt)
        self.assertEqual(ft.read_file(fp), new_txt)

        # Test hidden file backup with extension and existing backup
        ft.back_up_file(fp, backup_extension='foobar', hidden=True)
        test_files = os.listdir(os.path.dirname(fp))
        self.assertEqual(len(test_files), 11)
        new_file = [x for x in test_files if x not in known_files][0]
        self.assertTrue(new_file.startswith('.test.txt.foobar_'))
        known_files = os.listdir(os.path.dirname(fp))
        self.assertTrue(ft.read_file(first_hidden_bck_backup), txt)
        self.assertEqual(ft.read_file(os.path.join(os.path.dirname(fp), new_file)), new_txt)
        self.assertEqual(ft.read_file(fp), new_txt)

        # check whether strip_fn works as expected
        fp2 = fp + '.lua'
        ft.copy_file(fp, fp2)
        res = ft.back_up_file(fp2)
        self.assertTrue(fp2.endswith('.lua'))
        self.assertTrue('.lua' in os.path.basename(res))

        res = ft.back_up_file(fp2, strip_fn='.lua')
        self.assertFalse('.lua' in os.path.basename(res))

"    ('GCC', '4.6.4', '-test'),",
            "    ('MPICH', '1.8', '', ('GCC', '4.6.4')),",
            "    ('bar', '1.0'),",
            "    ('foobar/1.2.3', EXTERNAL_MODULE),",
            "]",
            '',
            "foo_extra1 = 'foobar'",
            '',
        ])

        handle, testec = tempfile.mkstemp(prefix=self.test_prefix, suffix='.eb')
        os.close(handle)

        ec = EasyConfig(None, rawtxt=rawtxt)
        ec.dump(testec)
        ectxt = read_file(testec)
        self.assertEqual(rawtxt, ectxt)

        # check parsing of dumped easyconfig
        EasyConfig(testec)

        check_easyconfigs_style([testec])

self.assertEqual(len(test_files), 9)
        new_file = [x for x in test_files if x not in known_files][0]
        self.assertTrue(new_file.startswith('.test.txt_'))
        known_files = os.listdir(os.path.dirname(fp))
        self.assertTrue(ft.read_file(first_hidden_backup), txt)
        self.assertEqual(ft.read_file(os.path.join(os.path.dirname(fp), new_file)), new_txt)
        self.assertEqual(ft.read_file(fp), new_txt)

        # Test file backup with extension and existing backup
        ft.back_up_file(fp, backup_extension='bck')
        test_files = os.listdir(os.path.dirname(fp))
        self.assertEqual(len(test_files), 10)
        new_file = [x for x in test_files if x not in known_files][0]
        self.assertTrue(new_file.startswith('test.txt.bck_'))
        known_files = os.listdir(os.path.dirname(fp))
        self.assertTrue(ft.read_file(first_bck_backup), txt)
        self.assertEqual(ft.read_file(os.path.join(os.path.dirname(fp), new_file)), new_txt)
        self.assertEqual(ft.read_file(fp), new_txt)

        # Test hidden file backup with extension and existing backup
        ft.back_up_file(fp, backup_extension='foobar', hidden=True)
        test_files = os.listdir(os.path.dirname(fp))
        self.assertEqual(len(test_files), 11)
        new_file = [x for x in test_files if x not in known_files][0]
        self.assertTrue(new_file.startswith('.test.txt.foobar_'))
        known_files = os.listdir(os.path.dirname(fp))
        self.assertTrue(ft.read_file(first_hidden_bck_backup), txt)
        self.assertEqual(ft.read_file(os.path.join(os.path.dirname(fp), new_file)), new_txt)
        self.assertEqual(ft.read_file(fp), new_txt)

        # check whether strip_fn works as expected
        fp2 = fp + '.lua'

def test_modaltsoftname(self):
        """Test specifying an alternative name for the software name, to use when determining module name."""
        topdir = os.path.dirname(os.path.abspath(__file__))
        ec_file = os.path.join(topdir, 'easyconfigs', 'test_ecs', 't', 'toy', 'toy-0.0-deps.eb')
        ectxt = read_file(ec_file)
        modified_ec_file = os.path.join(self.test_prefix, os.path.basename(ec_file))
        write_file(modified_ec_file, ectxt + "\nmodaltsoftname = 'notreallyatoy'")
        ec = EasyConfig(modified_ec_file)
        self.assertEqual(ec.full_mod_name, 'notreallyatoy/0.0-deps')
        self.assertEqual(ec.short_mod_name, 'notreallyatoy/0.0-deps')
        self.assertEqual(ec['name'], 'toy')