tests: handle any cmake detected python interpreter

tests/block_weight/CMakeLists.txt

@@ -42,4 +42,4 @@ target_link_libraries(block_weight
 
 add_test(
   NAME    block_weight
-  COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/compare.py ${CMAKE_CURRENT_SOURCE_DIR}/block_weight.py ${CMAKE_CURRENT_BINARY_DIR}/block_weight)
+  COMMAND ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/compare.py ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/block_weight.py ${CMAKE_CURRENT_BINARY_DIR}/block_weight)

tests/block_weight/block_weight.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 # Simulate a maximal block attack on the Monero network
 # This uses the scheme proposed by ArticMine
 # Written by Sarang Nother

tests/block_weight/compare.py

@@ -3,10 +3,17 @@
 import sys
 import subprocess
 
-print 'running: ', sys.argv[1]
-S0 = subprocess.check_output(sys.argv[1], stderr=subprocess.STDOUT)
-print 'running: ', sys.argv[2]
-S1 = subprocess.check_output(sys.argv[2], stderr=subprocess.STDOUT)
+if len(sys.argv) == 4:
+  first = [sys.argv[1], sys.argv[2]]
+  second = [sys.argv[3]]
+else:
+  first = [sys.argv[1]]
+  second = [sys.argv[2]]
+
+print 'running: ', first
+S0 = subprocess.check_output(first, stderr=subprocess.STDOUT)
+print 'running: ', second
+S1 = subprocess.check_output(second, stderr=subprocess.STDOUT)
 print 'comparing'
 if S0 != S1:
   sys.exit(1)