1 files changed, 49 insertions, 0 deletions
diff --git a/tests/backtest.py b/tests/backtest.py
new file mode 100644
index 00000000..b17aa242
--- /dev/null
+++ b/tests/backtest.py
@@ -0,0 +1,49 @@
+"""Add things to old Pythons so I can pretend they are newer, for tests."""
+
+# pylint: disable=W0622
+# (Redefining built-in blah)
+# The whole point of this file is to redefine built-ins, so shut up about it.
+
+import os
+
+# Py2k and 3k don't agree on how to run commands in a subprocess.
+try:
+    import subprocess
+except ImportError:
+    def run_command(cmd, status=0):
+        """Run a command in a subprocess.
+
+        Returns the exit status code and the combined stdout and stderr.
+
+        """
+        _, stdouterr = os.popen4(cmd)
+        return status, stdouterr.read()
+
+else:
+    def run_command(cmd, status=0):
+        """Run a command in a subprocess.
+
+        Returns the exit status code and the combined stdout and stderr.
+
+        """
+        proc = subprocess.Popen(cmd, shell=True,
+                stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+                stderr=subprocess.STDOUT
+                )
+        output, _ = proc.communicate()
+        status = proc.returncode        # pylint: disable=E1101
+
+        # Get the output, and canonicalize it to strings with newlines.
+        if not isinstance(output, str):
+            output = output.decode('utf-8')
+        output = output.replace('\r', '')
+
+        return status, output
+
+# No more execfile in Py3k
+try:
+    execfile = execfile
+except NameError:
+    def execfile(filename, globs):
+        """A Python 3 implementation of execfile."""
+        exec(compile(open(filename).read(), filename, 'exec'), globs)