Add a first test for tools/find_runtime_symbols.

tools/find_runtime_symbols/static_symbols.py

Index: tools/find_runtime_symbols/static_symbols.py
diff --git a/tools/find_runtime_symbols/static_symbols.py b/tools/find_runtime_symbols/static_symbols.py
index eb943e18680afdec9c623fccb94065fe45545df3..e972ad755747e544f204660e2eed3fe7d3ec797d 100644
--- a/tools/find_runtime_symbols/static_symbols.py
+++ b/tools/find_runtime_symbols/static_symbols.py
@@ -3,9 +3,7 @@
 # found in the LICENSE file.
 
 import bisect
-import os
 import re
-import sys
 
 
 _ARGUMENT_TYPE_PATTERN = re.compile('\([^()]*\)(\s*const)?')
@@ -185,14 +183,16 @@ class StaticSymbolsInFile(object):
         if line in ('Key to Flags:', 'Program Headers:'):
           break
 
-  def _parse_nm_bsd_line(self, line):
+  @staticmethod
+  def _parse_nm_bsd_line(line):
     if line[8] == ' ':
       return line[0:8], line[9], line[11:]
     elif line[16] == ' ':
       return line[0:16], line[17], line[19:]
     raise ParsingException('Invalid nm output.')
 
-  def _get_short_function_name(self, function):
+  @staticmethod
+  def _get_short_function_name(function):
     while True:
       function, number = _ARGUMENT_TYPE_PATTERN.subn('', function)
       if not number: