Clean up bctest.py and bitcoin-util-test.py

- remove newlines
- change tabs for spaces, to align with convention in other py files
- add comments
- add 'Bitcoin Core Developers' copyright notice

src/test/bctest.py

@@ -1,4 +1,5 @@
 # Copyright 2014 BitPay, Inc.
+# Copyright 2016 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 from __future__ import division,print_function,unicode_literals
@@ -11,6 +12,9 @@ import difflib
 import logging
 
 def parse_output(a, fmt):
+    """Parse the output according to specified format.
+
+    Raise an error if the output can't be parsed."""
     if fmt == 'json': # json: compare parsed data
         return json.loads(a)
     elif fmt == 'hex': # hex: parse and compare binary data
@@ -19,10 +23,17 @@ def parse_output(a, fmt):
         raise NotImplementedError("Don't know how to compare %s" % fmt)
 
 def bctest(testDir, testObj, exeext):
+    """Runs a single test, comparing output and RC to expected output and RC.
 
+    Raises an error if input can't be read, executable fails, or output/RC
+    are not as expected. Error is caught by bctester() and reported.
+    """
+    # Get the exec names and arguments
     execprog = testObj['exec'] + exeext
     execargs = testObj['args']
     execrun = [execprog] + execargs
+
+    # Read the input data (if there is any)
     stdinCfg = None
     inputData = None
     if "input" in testObj:
@@ -30,6 +41,7 @@ def bctest(testDir, testObj, exeext):
         inputData = open(filename).read()
         stdinCfg = subprocess.PIPE
 
+    # Read the expected output data (if there is any)
     outputFn = None
     outputData = None
     if "output_cmp" in testObj:
@@ -44,6 +56,7 @@ def bctest(testDir, testObj, exeext):
             logging.error("Output data missing for " + outputFn)
             raise Exception
 
+    # Run the test
     proc = subprocess.Popen(execrun, stdin=stdinCfg, stdout=subprocess.PIPE, stderr=subprocess.PIPE,universal_newlines=True)
     try:
         outs = proc.communicate(input=inputData)
@@ -52,6 +65,7 @@ def bctest(testDir, testObj, exeext):
         raise
 
     if outputData:
+        # Parse command output and expected output
         try:
             a_parsed = parse_output(outs[0], outputType)
         except Exception as e:
@@ -62,9 +76,11 @@ def bctest(testDir, testObj, exeext):
         except Exception as e:
             logging.error('Error parsing expected output %s as %s: %s' % (outputFn,outputType,e))
             raise
+        # Compare data
         if a_parsed != b_parsed:
             logging.error("Output data mismatch for " + outputFn + " (format " + outputType + ")")
             raise Exception
+        # Compare formatting
         if outs[0] != outputData:
             error_message = "Output formatting mismatch for " + outputFn + ":\n"
             error_message += "".join(difflib.context_diff(outputData.splitlines(True),
@@ -74,6 +90,7 @@ def bctest(testDir, testObj, exeext):
             logging.error(error_message)
             raise Exception
 
+    # Compare the return code to the expected return code
     wantRC = 0
     if "return_code" in testObj:
         wantRC = testObj['return_code']
@@ -82,6 +99,7 @@ def bctest(testDir, testObj, exeext):
         raise Exception
 
 def bctester(testDir, input_basename, buildenv):
+    """ Loads and parses the input file, runs all tests and reports results"""
     input_filename = testDir + "/" + input_basename
     raw_data = open(input_filename).read()
     input_data = json.loads(raw_data)
@@ -101,4 +119,3 @@ def bctester(testDir, input_basename, buildenv):
         sys.exit(1)
     else:
         sys.exit(0)
-

src/test/bitcoin-util-test.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 # Copyright 2014 BitPay, Inc.
+# Copyright 2016 The Bitcoin Core developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 from __future__ import division,print_function,unicode_literals
@@ -16,11 +17,13 @@ Runs automatically during `make check`.
 
 Can also be run manually from the src directory by specifiying the source directory:
 
-test/bitcoin-util-test.py --src=[srcdir]
+test/bitcoin-util-test.py --srcdir='srcdir' [--verbose]
 """
 
-
 if __name__ == '__main__':
+    # Try to get the source directory from the environment variables. This will
+    # be set for `make check` automated runs. If environment variable is not set,
+    # then get the source directory from command line args.
     try:
         srcdir = os.environ["srcdir"]
         verbose = False