adding simple test

tests/execute.py

@@ -0,0 +1,27 @@
+import logging
+from optparse import OptionParser
+
+from conda.plan import execute_plan
+from conda.api import get_index
+
+
+def main():
+    p = OptionParser(
+        usage="usage: %prog [options] FILENAME",
+        description="execute an conda plan")
+
+    p.add_option('-q', '--quiet',
+                 action="store_true")
+
+    opts, args = p.parse_args()
+
+    logging.basicConfig()
+
+    if len(args) != 1:
+        p.error('exactly one argument required')
+
+    execute_plan(open(args[0]), get_index(), not opts.quiet)
+
+
+if __name__ == '__main__':
+    main()

tests/simple.plan

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+# plan
+PRINT Fetching packages ...
+FETCH w3lib-1.2-py27_0
+FETCH pysam-0.6-py27_0
+
+PRINT Extracting packages ...
+PROGRESS 2
+EXTRACT w3lib-1.2-py27_0
+EXTRACT pysam-0.6-py27_0
+
+PRINT Linking packages ...
+PROGRESS 2
+LINK w3lib-1.2-py27_0
+LINK pysam-0.6-py27_0
+
+PRINT Unlinking packages ...
+PROGRESS 2
+UNLINK w3lib-1.2-py27_0
+UNLINK pysam-0.6-py27_0