Added support of requiring minimum coverage percentage using cov-min

pytest_cov.py

@@ -8,6 +8,10 @@
 import cov_core_init
 
 
+class CoverageError(Exception):
+    '''Indicates that our coverage is too low'''
+
+
 def pytest_addoption(parser):
     """Add options to control coverage."""
 
@@ -30,6 +34,9 @@ def pytest_addoption(parser):
                     dest='no_cov_on_fail',
                     help='do not report coverage if test run fails, '
                          'default: False')
+    group.addoption('--cov-min', action='store', metavar='MIN', type='int',
+                    help='Fail if the total coverage is less than MIN.')
+
 
 
 @pytest.mark.tryfirst
@@ -135,7 +142,11 @@ def pytest_terminal_summary(self, terminalreporter):
         if self.cov_controller is None:
             return
         if not (self.failed and self.options.no_cov_on_fail):
-            self.cov_controller.summary(terminalreporter._tw)
+            total = self.cov_controller.summary(terminalreporter._tw)
+            if total < self.options.cov_min:
+                raise CoverageError(('Required test coverage of %d%% not '
+                                     'reached. Total coverage: %.2f%%')
+                                    % (self.options.cov_min, total))
 
     def pytest_runtest_setup(self, item):
         if os.getpid() != self.pid: