Rename the internal var for --cov-append to cov_append and add specific option for it in the controller class.

Author: ionelmc

src/pytest_cov/engine.py

@@ -15,11 +15,12 @@
 class CovController(object):
     """Base class for different plugin implementations."""
 
-    def __init__(self, cov_source, cov_report, cov_config, config=None, nodeid=None):
+    def __init__(self, cov_source, cov_report, cov_config, cov_append, config=None, nodeid=None):
         """Get some common config used by multiple derived classes."""
         self.cov_source = cov_source
         self.cov_report = cov_report
         self.cov_config = cov_config
+        self.cov_append = cov_append
         self.config = config
         self.nodeid = nodeid
 
@@ -115,7 +116,7 @@ def start(self):
 
         self.cov = coverage.coverage(source=self.cov_source,
                                      config_file=self.cov_config)
-        if self.config.option.append_coverage:
+        if self.cov_append:
             self.cov.load()
         else:
             self.cov.erase()

src/pytest_cov/plugin.py

@@ -36,7 +36,6 @@ def pytest_addoption(parser):
     group.addoption('--cov-fail-under', action='store', metavar='MIN', type='int',
                     help='Fail if the total coverage is less than MIN.')
     group.addoption('--cov-append', action='store_true', default=False,
-                    dest='append_coverage',
                     help='do not delete coverage but append to current, '
                          'default: False')
 
@@ -117,6 +116,7 @@ class Config(object):
             self.options.cov_source,
             self.options.cov_report,
             self.options.cov_config,
+            self.options.cov_append,
             config,
             nodeid
         )