Add and document codecov tests.

vdt · Jun 24, 2016 · 307ff48 · 307ff48
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diff --git a/CONTRIBUTING b/CONTRIBUTING
@@ -24,5 +24,9 @@ https://twistedmatrix.com/trac/newticket
 Twisted uses Trac to keep track of bugs, feature requests, and associated
 patches because GitHub doesn't provide adequate tooling for its community.
 
-For a PR to be accepted it needs to have at least all Travis CI tests passing.
+For a PR to be accepted it needs to have:
+
+* all Travis CI tests passing
+* patch coverage of 100% as reported by codecov.io
+
 The Travis CI tests currently represent only a subset of the all the platforms Twisted supports, so the buildbot tests are still the actual gate for PR acceptance.
diff --git a/codecov.yml b/codecov.yml
@@ -0,0 +1,20 @@
+#
+# We want %100 coverage for new patches to make sure we are always increasing
+# the coverage.
+#
+# For now codecov.io has no way to fail if project overall coverage is
+# decreased... but I think this is hard as for example if we deprecated and
+# remove some code which is well covered we might end up with a smaller
+# coverage.
+#
+coverage:
+  precision: 2
+  round: down
+  status:
+    patch:
+      default:
+        target: 100%
+
+comment:
+  layout: "header, diff, uncovered"
+  behavior: default