Fix test for bad construction var

Didn't notice that the changes for env.__setitem__ caused a quote
mark to flip in the error output, failing one test (a back-quote
went to a single regular quote). Updated the test, and snuck in
the tools-performance-hack.

Signed-off-by: Mats Wichmann <mats@linux.com>

Author: mwichmann

test/bad-variables.py

@@ -1,6 +1,8 @@
 #!/usr/bin/env python
 #
-# __COPYRIGHT__
+# MIT License
+#
+# Copyright The SCons Foundation
 #
 # Permission is hereby granted, free of charge, to any person obtaining
 # a copy of this software and associated documentation files (the
@@ -20,9 +22,6 @@
 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-#
-
-__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
 
 """
 Test that setting illegal construction variables fails in ways that are
@@ -37,13 +36,14 @@
 SConscript_path = test.workpath('SConscript')
 
 test.write(SConstruct_path, """\
-env = Environment()
+_ = DefaultEnvironment(tools=[])
+env = Environment(tools=[])
 env['foo-bar'] = 1
 """)
 
 expect_stderr = """
-scons: *** Illegal construction variable `foo-bar'
-""" + test.python_file_line(SConstruct_path, 2)
+scons: *** Illegal construction variable 'foo-bar'
+""" + test.python_file_line(SConstruct_path, 3)
 
 test.run(arguments='.', status=2, stderr=expect_stderr)
 
@@ -54,14 +54,15 @@
 """)
 
 test.write('SConscript', """\
-env = Environment()
+_ = DefaultEnvironment(tools=[])
+env = Environment(tools=[])
 env['foo(bar)'] = 1
 """)
 
 
 expect_stderr = """
-scons: *** Illegal construction variable `foo(bar)'
-""" + test.python_file_line(SConscript_path, 2)
+scons: *** Illegal construction variable 'foo(bar)'
+""" + test.python_file_line(SConscript_path, 3)
 
 test.run(arguments='.', status=2, stderr=expect_stderr)