Improve regex for test parameterization to support function pointers

The regex to match function names for the test parameterization used the
wildcard '.*'. This lead to an error when you try to add a function
pointer as arguement.

The regex will now only match the word characters a-z A-Z 0-9 and
underscore (which are all characers that are accepted by the C standard)

Author: Jannis Baudisch

auto/generate_test_runner.rb

@@ -131,6 +131,7 @@ def find_tests(source)
     lines.each_with_index do |line, _index|
       # find tests
       next unless line =~ /^((?:\s*(?:TEST_CASE|TEST_RANGE)\s*\(.*?\)\s*)*)\s*void\s+((?:#{@options[:test_prefix]}).*)\s*\(\s*(.*)\s*\)/m
+      next unless line =~ /^((?:\s*(?:TEST_CASE|TEST_RANGE)\s*\(.*?\)\s*)*)\s*void\s+((?:#{@options[:test_prefix]})\w*)\s*\(\s*(.*)\s*\)/m
 
       arguments = Regexp.last_match(1)
       name = Regexp.last_match(2)